Prof. Dr. Michael Dornbusch

I. Journals

C. Stromberg, M. Dornbusch, G. Grundmeier, A Combined Spectroscopic and Electrochemical Study of Zirconium based Conversion Layers on Zinc Coated Steel, 2006 Meet. Abstr. MA2005-01 234

M. Dornbusch, The use of modern electrochemical methods in the development of corrosion protective coatings, Prog. Org. Coat. 61 (2008) 240-244

M. Dornbusch, M. Hickl, K. Wapner, L. Jandel, Corrosion protection mechanism of chromate-free coil coating systems, Millenium Steel 2008, 231-236

M. Dornbusch, S. Kirsch, C. Henzel, C. Deschamps, S. Overmeyer, K. Cox, M. Wiedow, M. Dargatz, U. Meisenburg, Characterization of the Water Uptake and Electrolyte Uptake of Organic Coatings and the Consequences by Means of Electrochemical Impedance Spectroscopy and UV-VIS Spectroscopy, Prog. Org. Coat. 89 (2015), 332-343

M. Dornbusch, T. Biehler, M. Conrad, A. Greiwe, D. Momper, L. Schmidt, M. Wiedow, Unusable Pretreatment of Steel and Zinc Surfaces Based on Phytic Acid, JUnQ, 6, 2, 1-7, 2016

M. Reichinger, W. Bremser, M. Dornbusch, Interface and volume transport on technical cataphoretic painting: A comparison of steel, hot-dip galvanised steel and aluminium alloy, Electrochim. Acta 231 (2017) 135-152

C. Langer, M. Dornbusch, Corrosion behavior of decorative chromium layer systems in concentrated aqueous electrolytes in: Proc. NACE Corrosion 2017, 166-170

J. Wysoglad, J.-E. Ehlers, T. Lewe, M. Dornbusch, J. S. Gutmann, Conformational study of melamine crosslinkers and spectroscopical comparison of HMMM molecules by practical measurements and quantum chemical calculations, J. Mol. Struct. 1166 (2018) 456-469

C. Langer, W. Wendland, K. Honold, L. Schmidt, J. Gutmann, M. Dornbusch, Corrosion Analysis of Decorative Microporous Chromium Plating Systems in Concentrated Aqueous Electrolytes, Engineering Failure Analysis 91 (2018) 255–274

C. Langer, W. Wendland, K. Honold, L. Schmidt, J. Gutmann, M. Dornbusch, Klärung des spezifischen Korrosionsverhaltens von mikroporigen Chromüberzugssystemen in CaCl₂-Elektrolyten, BHM Berg- und Hüttenmännische Monatshefte, 163(7), 275-280

D. S. Wunschik, Kim N. Ingenbosch, M. Zähres, J. Horst, C. Mayer, M. Jäger, V. Strehmel, M. Dornbusch, K. Hoffmann-Jacobsen, Biocatalytic and solvent-free synthesis of a bio-based biscyclocarbonate, Green Chem., 2018, 20, 4738-4745

C. Deschamps, N. Simpson, M. Dornbusch, Anti-static Properties of Clearcoats by the Use of Special Additives, J. Coat. Technol. Res. 2019, https://doi.org/10.1007/s11998-019-00283-6

D. Wunschik, K. Hoffmann-Jacobsen M. Dornbusch, Lipase catalyzed modification of functionalized polymers, Prog. Org. Coat. 2019, 20(5): 9358–9379.

P. Knospe, P. Böhm, J. Gutmann, M. Dornbusch, Oxazoline-based crosslinking reaction for coatings, J. Coat. Technol. Res. Oxazolin, J. Coatz. Technol. Res, 18, 2021, 1199-1207, doi.org/10.1007/s11998-021-00479-9 

J. Seithümmer, M. Öztürk, D. S.Wunschik, J. Prießen, H. J. Schultz, M. Dornbusch, J. S. Gutmann, K. Hoffmann-Jacobsen1, Enzymatic synthesis of novel aromatic-aliphatic polyesters with increased hydroxyl group density, Biotechnol. J, 2022;2100452, DOI:10.1002/biot.202100452

J. Seithümmer, P. Knospe, R. Reichmann, J. S. Gutmann, K. Hoffmann-Jacobsen, M. Dornbusch, Comparison of 5- and 6-membered cyclic carbonate-polyisocyanate adducts for high performance coatings, J. Coat. Technol. Res. 2022, https://doi.org/10.1007/s11998-022-00665-3

P. Knospe, J. Seithümmer, R. Reichmann^,J. S. Gutmann, K. Hoffmann-Jacobsen, M. Dornbusch, Impact of enzymatically synthesized aliphatic-aromatic polyesters with increased hydroxyl group content on coating properties, J. Coat. Technol. Res. 2022, doi.org/10.1007/s11998-022-00651-9

P. Knospe, R. Reichmann, J. S. Gutmann, M. Dornbusch, Vanillin as low temperature isocyanate-deblocking agent and its use in one component aqueous coatings, J. Coat. Technol. Res. 2022, doi.org/10.1007/s11998-022-00696-w

B. Böhm, M. Dornbusch, J. Gutmann, Phytic acid oligomers as bio-based crosslinkers for Epoxy- and Polyolresins, J. Coat. Technol. Res. 2023, doi.org/10.1007/s11998-023-00827-x

M. Weinert, J. Gutmann, M. Dornbusch, Hydrophobic Phytic Acid Conversion Layers for Corrosion Protection of Steel Surfaces, J. Coat. Technol. Res. 2024; doi.org/10.1007/s11998-023-00852-w

Knospe, P., Shams Uldeen, M., Reichmann, R. et al. Next-generation urea resins: formaldehyde-free coating materials based on higher aldehydes and amides. J Coat Technol Res22, 999–1017 (2025). doi.org/10.1007/s11998-024-01027-x

Knospe, F., Knospe, P., Gutmann, J.S., M. Dornbusch, Cyclodextrin-based corrosion inhibitor carrier in a polymer-network. J Coat Technol Res22, 1387–1408 (2025). https://doi.org/10.1007/s11998-024-01047-7

Rubbert, L. V., Knospe, P., Weiß, S., Scherübl, M., Wander, L., Gutmann, J. S., Dornbusch, M., Biobased diblock copolymers and associated reactivity ratios via RAFT-polymerisation as new dispersing additives, RSC Advances, 2025, 15, 39962 – 39974, https://doi.org/10.1039/d5ra06866e

J. W. van der Koelen, F. Kother, M. Dornbusch, J. S. Gutmann, Eui-Young Shin, Graphene as a High-Performance Additive: The Importance of the fine Dispersion for Corrosion Protection in Coatings, J. Coat. Technol. Res, 2025, accepted

P. Ohagen, J. S. Gutmann, M. Dornbusch, Surface characterization by confocal Raman spectroscopy: Phase differentiation of Zn-Mg alloys on industrial substrates, J. Failure Analysis and Prevention, 2026, accepted

D. Sandvoß, J.S. Gutmann, M. Dornbusch, Catalyst-controlled sustainable crosslinking reaction for green itaconate polyester coatings, J. Coat. Technol. Res. 2026, accepted

A.Jüngerkes, G. Waidmann, D. Momper, M. Dornbusch, J. S. Gutmann, Understanding bluish undertones in black tones, J. Coat. Technol. Res, 2026, accepted

II. Books

Thesis, M. Dornbusch, Synthese von fünfringheterocyclischen Retinoiden als Chromophore für das Bacteriorhodopsin (www.ulb.uni-duesseldorf.de/diss/mathnat/2001/dornbusch.html), Heinrich-Heine-Universität Düsseldorf, 2001

M. Dornbusch, R. Rasing, U. Christ, Epoxidharze, Vincentz Verlag, Hannover, 2015

M. Dornbusch, R. Rasing, U. Christ, Epoxy Resins, Vincentz Network, Hanover, 2016

M. Dornbusch, Corrosion Analysis, CRC Press, Boca Raton, London, New York, 2018

III. Patents (17.06.2026: 178 patents in 34 families)

EP000003885387A1 [DE] POLYISOCYANAT-BASIERTE POLYADDITIONSVERBINDUNGEN MIT FÜNFGLIEDRIGEN CYCLISCHEN IMINOETHER-STRUKTURELEMENTEN [EN] POLYISOCYANATE-BASED POLYADDITION COMPOUNDS HAVING FIVE-MEMBERED CYCLIC IMINOETHER ...

DE102006053291A1 [DE] Lackschichtbildendes Korrosionsschutzmittel mit guter Haftung und Verfahren zu dessen stromfreier Applikation

DE102006053292A1 [DE] Lackschichtbildendes Korrosionsschutzmittel mit verminderter Rißbildung und Verfahren zu dessen stromfreier Applikation

DE112017005158T5 [DE] Tiefziehverfahren zur Herstellung eines Batteriebechers

WO002015024824A1 [DE] VERFAHREN ZUR HERSTELLUNG VON POLYAMIDIMIDEN UNTER VERWENDUNG VON N-FORMYLMORPHOLIN [EN] PROCESS FOR PRODUCING POLYAMIDEIMIDES WITH USE OF N-FORMYLMORPHOLINE

DE102021123903A1 [DE] Substituierte Phytinsäurederivate

DE102010040430A1 [DE] Extrem hochtemperaturfestes Bauteil mit einer extrem hochtemperaturfesten Beschichtung

DE102008047359A1 [DE] Härtende Zusammensetzungen zur Beschichtung von Verbundwerkstoffen

DE102009007624A1 [DE] Beschichtungsmittel für korrosionsstabile Lackierungen

DE102009007633B4 [DE] Mehrstufiges Verfahren zur Lackierung metallischer Substrate

DE102009007629A1 [DE] Beschichtungsmittel für korrosionsstabile Lackierungen

WO002015197380A1 [DE] LÖSUNGEN VON POLYVINYLIDENFLUORID IN N-FORMYL- ODER N-ACETYLMORPHOLIN [EN] POLYVINYLIDENE FLUORIDE SOLUTIONS IN N-FORMYL- OR N-ACETYLMORPHOLINE

DE102005038608A1 [DE] Polymerzusammensetzung für den Korrosionsschutz

WO002017108510A1 [EN] METHOD FOR COATING PRINTED CIRCUIT BOARDS

WO002015117857A1 [DE] POLYMERISATION IN N-FORMYLMORPHOLIN [EN] POLYMERISATION IN N-FORMYLMORPHOLINE

DE102005023728A1 [DE] Lackschichtbildendes Korrosionsschutzmittel und Verfahren zu dessen stromfreier Applikation

WO002022263306A1 [DE] ORGANISCHE POLYISOCYANATE MIT ALDEHYDBLOCKIERUNG [EN] ALDEHYDE-BLOCKED ORGANIC POLYISOCYANATES

WO002020193712A1 [EN] BRASSICA PLANT RESISTANT TO DOWNY MILDEW

DE102005023729A1 [DE] Korrosionsschutzmittel und Verfahren zu dessen stromfreier Applikation

DE102008012085A1 [DE] Kathodischer Elektrotauchlack enthaltend metallorganische Verbindung

DE102022110908A1 [DE] Phytinsäureoligomer

DE102012102161A1 [DE] Antifouling-Bahn

EP000004105251A1 [DE] VERNETZBARE ZUSAMMENSETZUNGEN, ENTHALTEND IMIN- UND/ODER AMINAL-BILDENDE KOMPONENTEN [EN] CROSSLINKABLE COMPOSITIONS CONTAINING IMINE AND / OR AMINAL-FORMING

DE102012105706A1 [DE] Beschichtungszusammensetzung

DE102005004292A1 [DE] Verfahren zum Aufbringen integrierter Vorbehandlungsschichten umfassend Thioamide auf metallische Oberflächen [EN] Method for applying corrosion protection layer on metallic surfaces comprises ...

DE102010019245A1 [DE] Verfahren zur autophoretischen Beschichtung, Beschichtungsmittel und Mehrschichtlackierung

DE102008036685A1 [DE] Zweischicht-Beschichtungssysteme mit verbesserter Zwischenhaftung

DE102021102513A1 [DE] Substituierte Phytinsäurederivate

WO002007125038A2 [DE] VERFAHREN ZUM AUFBRINGEN KORROSIONSSCHUTZSCHICHTEN AUF METALLISCHE OBERFLÄCHEN [EN] METHOD FOR THE APPLICATION OF CORROSION-RESISTANT LAYERS TO METALLIC SURFACES

DE102009007632A1 [DE] Beschichtungsmittel für korrosionsstabile Lackierungen

DE102007012406A1 [DE] Verfahren zur Korrosionsschutzausrüstung metallischer Substrate

DE102010038470B4 [DE] Verfahren zum Herstellen einer stoffschlüssigen Verbindung, Bauteil sowie Verwendung eines Beschichtungsmittels

EP000004279522A1 [DE] IN WASSER DISPERGIERBARE POLYISOCYANATE MIT ALDEHYDBLOCKIERUNG UND DARAUS ERHÄLTLICHE WÄSSRIGE ZUSAMMENSETZUNGEN [EN] WATER-DISPERSIBLE POLYISOCYANATES WITH ALDEHYDE BLOCKING AND AQUEOUS COMPOSITIONS ...

DE102009007630A1 [DE] Beschichtungsmittel für korrosionsstabile Lackierungen

IV. Congress Contributions

M. Dornbusch, The use of modern electrochemical methods in the industry, CoSi, Nordwijk, 2007

M. Dornbusch, K. Wapner, Interaction of Pre-Treatments with Coatings Measured by Means of Electrochemical Methods, Korrosionsschutzsymposium, 2007

S. Toews, W. Bremser, H. Hintze-Bruening, M. Dornbusch, New concepts for corrosion protection, EUROCORR 2010 – The European Corrosion Congress, Moscow, 2010

S. Toews, W. Bremser, H. Hintze-Bruening, S. Sinnwell, M. Dornbusch, R. Bautista-Mester, W. Kreis, Smart Functionalized Polymer Dispersions for effective mapping of heterogeneous metal surfaces: New Concepts for Corrosion Protection, CoSi, Noordwijk, 2010

M. Dornbusch, Die perfekte Oberfläche auf Schrauben, 76. GDCh Lacktagung, Münster, 2011

M. Dornbusch, C. Henzel, C. Deschamps, S. Overmeyer, K. Cox, M. Wiedow, What Happens During the Swelling of a Coating? ETCC, Köln, 2014

M. Reichinger, M. Dornbusch, Elektrochemische Untersuchungen an einer kathodischer Tauchlackierung auf verschiedenen Metalluntergründen, GDCh 79. Lacktagung, Schwerin, 2015

M. Reichinger, M. Dornbusch, Interface and Volume Diffusion NaCl Solution Meets Cataphoretic Painting, 18. Tagung Festkörperanalytik, Wien, 2015

M. Reichinger, M. Dornbusch, Salt Water Transport through an Automotive Coating System and its Physicochemical Aftermaths, CoSi, Nordwijk, 2016

M. Dornbusch, Neue Konversionsschichten - Wissenschaftlicher Gehalt von Publikationen -, 80. GDCh Lacktagung, Paderborn, 2016

M. Dornbusch, Diffusionsprozesse an Beschichtungssystemen, DFO - Korrosionsschutz im Leichtbau, Wiesbaden, 2016

M. Reichinger, M. Dornbusch, Raman-SKP Study of the Aluminium/E-coat Interface, EUROCORR, Montpellier, 2016

C. Langer, M. Dornbusch, Corrosion Behavior of Decorative Chromium Layer Systems in Concentrated Aqueous Electrolytes, NACE Corrosion, Louisiana, 2017

T. Krawczyk, M. Dornbusch, J. S. Gutmann, Wasser- und Elektrolyttransporte in autophoretisch abscheidbaren Korrosionsschutzbeschichtungen, GDCh 82. Lacktagung, Bayreuth, 2018

T. Krawczyk, M. Dornbusch, Wasser- und Elektrolytransporte in autophoretisch abgeschiedenen Korrosionsschutzbeschichtungen, Wintherthurer Oberflächentag, 2019

T. Krawczyk, M. Dornbusch, Water and electrolyte transports in autophoretic corrosion protection coatings CoSi, Nordwijk, 2019

T. Krawczyk, M. Dornbusch, Water and electrolyte transports in autophoretic corrosion protection coatings EuroCorr, Seville, 2019

S. Khazraee-Sheidaee-Mehr, M. Dornbusch, W: Bremser, Investigation of water(electrolyte) diffusion/transport through the matrix of coating and metal/water-base organic coating interface, EurCorr, Seville, 2019

P. Knospe, P. Böhm, M. Dornbusch, J. Gutmann, High performance polymer networks from novel crosslinking reactions, CoSi, online, 2021

M. Dornbusch, S. Khazraee-Sheidaee-Mehr, S. Driesen, A. Haeger, L. Drückes, W. Bremser, What is the rate-determining step in the delamination from a defect of organic coatings on a metal substrate? CoSi, online, 2021

M. Weinert, M. Dornbusch, Hydrophobic Phytic Acid Conversion Layers for Corrosion Protection of Steel Surfaces, EuroCorr, online, 2021

M. Weinert, M. Dornbusch, Sustainable autophoretic coatings for corrosion protection of substrates, CoSi, Nordweijk, 2022

P. Böhm, M. Dornbusch, Phytic acid oligomers as green and novel hardeners for classic binder systems, CoSi 2022

P. Böhm, M. Dornbusch, Phytic acid oligomers as green and novel hardeners for classic binder systems, GDCh 84. Lacktagung, Würzburg, 2022

F. Knospe, M. Dornbusch, Modifikation von ß-Cyclodextrin und die Nutzung von Einschlussverbindungen für neuartige Korrosionsschutzbeschichtungen, GDCh 86. Lacktagung, Magdeburg, 2024

L.V. Rubbert, M. Dornbusch, Amphiphilic Thio-RAFT (co)polymers from renewable materials as adhesion promoters for plastic surfaces, GDCh 86. Lacktagung, Magdeburg, 2024

M. Dornbusch, Konversionsschichten auf Basis nachwachsender Rohstoffe, DFO Elektrotauchlackforum 2024 in Kaarst,

J. van der Koelen, M. Dornbusch, Graphene's role in corrosion protection: Improving zinc and non-zinc coatings, ECS Nürnberg, 2025

F. Knospe, M. Dornbusch, Korrosionsschutz durch Einschlussverbindungen: ß-Cyclodextrin-Derivate zur kontrollierten Freisetzung von Korrosionsinhibitoren, GDCh 87. Lacktagung, Aachen, 2025

R. Reichmann, M. Dornbusch, Biobasierte Phytinsäureester als nachhaltige Härterkomponenten in Korrosionsschutzsystemen, GDCh 87. Lacktagung, Aachen, 2025

D. Sandvoß, M. Dornbusch, Itaconsäure als nachhaltiger Härter für nachhaltige Polyester im Lebensmittelkontaktbereich, GDCh 87. Lacktagung, Aachen, 2025

V. Poster

Poster, M. Dornbusch, G. Grundmeier, Formation of thin inorganic amorphous films from aqueous solution, Tagung der Deutschen Bunsengesellschaft, Kiel, 2003

Poster, H. Schultz, V. Bliem, F. S. Merkel, W.-D. Loos, K. Cox, M. Dornbusch, Investigation of corrosion protective coatings for transformer tanks and calculation of conductive heat transport of coated metal surfaces, CWIEME, June, Berlin, 2014

Poster, H. Schultz, V. Bliem, F. S. Merkel, W.-D. Loos, K. Cox, M. Dornbusch, Influence of weather conditions on the heat transport of corrosion protected transformer tanks CWIEME, June, Berlin, 2014

Poster, S. Khazraee Sheidaee Mehr, W. Bremser, M. Dornbusch, Utilizing electrochemical impedance spectroscopy (EIS) and simultaneous Kelvin Probe (KP)- Raman spectroscopy to investigate the diffusion/migration of electrolyte along the metal/water-borne organic coating interface ETCC, Amsterdam, 2018

Poster, T. Krawczyk, J. S. Gutmann, M. Dornbusch, Characterization of water and electrolyte transports in autophoretic corrosion protection coatings by means of optical spectroscopies and electrochemical impedance spectroscopy, ETCC, Amsterdam, 2018

Poster, J. Wysoglad, J.-E. Ehlers, T. Lewe, M. Dornbusch, J. S. Gutmann, Conformational study of melamine crosslinkers and spectroscopical comparison of HMMM molecules, ETCC, Amsterdam, 2018

Poster, S. Paul, M. Dornbusch, Visualisierung von Transportvorgängen in Beschichtungen, GDCh 82. Lacktagung Bayreuth, 2018

Poster, Y. Ophardt, M. Dornbusch, Untersuchung der Wasser- und Elektrolytaufnahme in unterschiedlich pigmentierten ACC-Beschichtungen mittels mikroskopischer und spektroskopischer Messmethoden, 82. GDCh Lacktagung Bayreuth, 2018

Poster, S. Prinz, M. Dornbusch, Untersuchungen von amphiphilen Oberflächen zur Verhinderung von marinem Biofouling, 82. GDCh Lacktagung Bayreuth, 2018

Poster, M. Weinert, M. Dornbusch, Hydrophobic phytic acid (PA) conversion layers for corrosion protection of steel surfaces, CoSi, online, 2021

Poster, R. Reichmann, M. Dornbusch, Phytic Acid based Bio-Crosslinkers for sustainable Anti-Corrosion Coating, ECS Nürnberg, 2025

Poster, Z. Langecker, M. Dornbusch, Analyse der Korrosionsprozesse in einem Defekt organischer Beschichtungen, ECS, 2025

Poster, D. Sandvoß, M. Dornbusch, Comparison of different analytical methods for determining the molecular weight of bio-based polyesters, ECS Nürnberg, 2025

Poster, Z. Langecker, M. Dornbusch, Analyse der Korrosionsprozesse in einem Defekt organischer Beschichtungen, 87. GDCh Lacktagung, Aachen, 2025

Poster, L. V. Rubbert, M. Dornbusch, Tailored RAFT copolymers in solvent and water-based systems: Advanced wetting and dispersing additives, GDCh 87. Lacktagung, Aachen, 2025

Sustainable coating systems

This refers to sustainable raw materials, as the focus of research is on corrosion protection; recyclable coatings are generally unsuitable here due to the need for durability and resistance to all external influences, and therefore renewable raw materials are used. Furthermore, we also understand sustainability to mean that coatings are toxicologically safe. This does not mean that toxic raw materials such as isocyanates cannot be used, but the paint can should contain only harmless substances.

Binders

Phytic acid, a plant-based raw material classified as an anti-food, can be used as a raw material for the synthesis of polyesters. The proof of concept has already been demonstrated ^[1] and further work is underway in the research group. The promising results have been patented by the university ^{[2, 3]}.

Carbohydrates are widespread and can therefore also serve as renewable raw materials. One possibility is the use of cyclodextrins. These can serve as raw materials for binders, which can additionally incorporate corrosion inhibitors and thus improve corrosion protection ^[4].

Polyesters are an important group of binders in the coatings industry, and replacing them with sustainable raw materials is an important step towards a sustainable coatings industry. The synthesis of polyesters from sustainable raw materials has been successful, and novel cross-linking mechanisms have also been implemented in polyesters ^[5].

Cross-Linkers

Cyclic carbonates based on glycerol carbonate are widely reported in the literature. We were interested in the direct coupling of carbonates to polyesters, which we achieved in collaboration with Kerstin Hoffmann-Jacobsen’s research group ^[6-8]. Furthermore, we were able to elucidate the reactivity of carbonates with rings of varying sizes ^[9]. Finally, by combining enzymatic and classical chemical synthesis, new properties such as an increased number of OH groups on the polyester can also be achieved ^[10].

Oxazolines can also be used as a reactive group for cross-linking binders, albeit at relatively high cross-linking temperatures ^[11], which has also been patented ^[12]

Vanillin, on the other hand, can be used as a blocking agent for isocyanates, which deblock at low temperatures, thereby saving energy and emitting a harmless blocking agent ^{[13, 14]}. This has been achieved in aqueous cross-linkers [15].

Urea resins typically contain formaldehyde, which is of concern. With a new generation of urea resins based on aromatic aldehydes, polymer networks with exciting properties can be produced, allowing toxicologically problematic components to be omitted from the formulation [16, 17].

If sustainable itaconic acid is used in polyesters, it can serve as a cross-linker. Itaconic acid can undergo purely thermal radical polymerisation but can also react via an Oxa-Michael addition, and through the skilful selection of catalysts, the ratio of both network structures can be controlled [5].

Additives

Additives can also be produced using renewable raw materials. We were able to produce dispersing additives with exciting properties using controlled radical polymerisation [18].

Pigments

Sustainable pigments are a challenging topic, as they generally involve mineral raw materials, which are not sustainable. Consequently, the central concept at present is the reduction of pigments in anti-corrosion coatings.

Using graphene as a pigment allows the quantity of other pigments to be reduced and improves corrosion protection [19].

Sustainable conversion coatings

In the first step, a replacement for phosphating was sought, with zirconium-based pretreatments now having become state of the art [20].

Novel pretreatments using few mineral resources have been reported in the literature in the form of phytic acid-based coatings. We were able to demonstrate that, due to the high polarity of phytic acid, it is not readily possible to combine these coatings with organic coatings [21].

If the phytic acid is modified to be hydrophobic, similar to the binders, through esterification with non-polar alcohols, conversion coatings can be produced with excellent corrosion protection properties in combination with an electrostatic powder coating [22]. Due to the very good corrosion protection properties, these were patented by the university [23, 24]

Corrosion mechanisms and coatings

The development of novel anti-corrosion coatings requires a fundamental understanding of electrochemical and transport processes. To this end, the research group utilises modern methods such as the scanning Kelvin probe (SKP) and electrochemical impedance spectroscopy (EIS) [25].

The SKP can be used to investigate and understand the effect of new coatings, such as chromate-free primers [26], and transport processes in cathodic protection (CP) coatings on various substrates, with and without pigments, have also been analysed, revealing that pigments play a key role in interfacial transport [27].

EIS can be used to investigate water transport processes in coatings and, in combination with UV-VIS spectroscopy, the transport of electrolytes as well [28].

By combining EIS with classical methods such as current density-potential measurements, the phenomenon of mud corrosion on chromium-plated plastic parts on car bodies, which occurs primarily in Russia, can be elucidated. A reversal of polarity occurs in the layers, i.e. the cathodic protection of the nickel layers beneath the chromium layer is reversed into accelerated anodic dissolution.

Novel substrates such as zinc-magnesium coatings on steel are also a sustainable concept, as the required level of corrosion protection can be achieved with a consistent amount of zinc or coating. The composition and, consequently, the property profiles of such surfaces have been analysed for the first time using Raman spectroscopy.

References:

[1] B. Böhm, M. Dornbusch, J. Gutmann, Phytic acid oligomers as bio-based crosslinkers for Epoxy- and Polyolresins, J. Coat. Technol. Res. 2023, https://doi.org/10.1007/s11998-023-00827-x

[2] DE102022110908A1

[3] WO2023/213798A1

[4] Knospe, F., Knospe, P., Gutmann, J.S., M. Dornbusch, Cyclodextrin-based corrosion inhibitor carrier in a polymer-network. J Coat Technol Res22, 1387–1408 (2025). https://doi.org/10.1007/s11998-024-01047-7

[5] D. Sandvoß, J.S. Gutmann, M. Dornbusch, Catalyst-controlled sustainable crosslinking reaction for green itaconate polyester coatings, J. Coat. Technol. Res. 2026, accepted

[6] D. S. Wunschik, Kim N. Ingenbosch, M. Zähres, J. Horst, C. Mayer, M. Jäger, V. Strehmel, M. Dornbusch, K. Hoffmann-Jacobsen, Biocatalytic and solvent-free synthesis of a bio-based biscyclocarbonate, Green Chem., 2018, 20, 4738-4745

[7] D. Wunschik, K. Hoffmann-Jacobsen M. Dornbusch, Lipase catalyzed modification of functionalized polymers, Prog. Org. Coat. 2019, 20(5): 9358–9379.

[8] J. Seithümmer, M. Öztürk, D. S.Wunschik, J. Prießen, H. J. Schultz, M. Dornbusch, J. S. Gutmann, K. Hoffmann-Jacobsen1, Enzymatic synthesis of novel aromatic-aliphatic polyesters with increased hydroxyl group density, Biotechnol. J, 2022;2100452, DOI:10.1002/biot.202100452

[9] J. Seithümmer, P. Knospe, R. Reichmann, J. S.Gutmann, K. Hoffmann-Jacobsen, M. Dornbusch, Comparison of 5- and 6-membered cyclic carbonate-polyisocyanate adducts for high performance coatings, J. Coat. Technol. Res. 2022, https://doi.org/10.1007/s11998-022-00665-3

[10] P. Knospe, J. Seithümmer, R. Reichmann^,J. S. Gutmann, K. Hoffmann-Jacobsen, M. Dornbusch, Impact of enzymatically synthesized aliphatic-aromatic polyesters with increased hydroxyl group content on coating properties, J. Coat. Technol. Res. 2022, doi.org/10.1007/s11998-022-00651-9

[11] P. Knospe, P. Böhm, J. Gutmann, M. Dornbusch, Oxazoline-based crosslinking reaction for coatings, J. Coat. Technol. Res. Oxazolin, J. Coatz. Technol. Res, 18, 2021, 1199-1207, doi.org/10.1007/s11998-021-00479-9 

[12] EP000003885387A1

[13] P. Knospe, R. Reichmann, J. S. Gutmann, M. Dornbusch, Vanillin as low temperature isocyanate-deblocking agent and its use in one component aqueous coatings, J. Coat. Technol. Res. 2022, doi.org/10.1007/s11998-022-00696-w

[14] WO002022263306A1

[15] EP000004279522A1

[16] Knospe, P., Shams Uldeen, M., Reichmann, R. et al. Next-generation urea resins: formaldehyde-free coating materials based on higher aldehydes and amides. J Coat Technol Res22, 999–1017 (2025). doi.org/10.1007/s11998-024-01027-x

[17] EP000004105251A1

[18] Rubbert, L. V., Knospe, P., Weiß, S., Scherübl, M., Wander, L., Gutmann, J. S., Dornbusch, M., Biobased diblock copolymers and associated reactivity ratios via RAFT-polymerisation as new dispersing additives, RSC Advances, 2025, 15, 39962 – 39974, https://doi.org/10.1039/d5ra06866e

[19] J. W. van der Koelen, F. Kother, M. Dornbusch, J. S. Gutmann, Eui-Young Shin, Graphene as a High-Performance Additive: The Importance of the fine Dispersion for Corrosion Protection in Coatings, J. Coat. Technol. Res, 2025, accepted

[20] C. Stromberg, M. Dornbusch, G. Grundmeier, A Combined Spectroscopic and Electrochemical Study of Zirconium based Conversion Layers on Zinc Coated Steel, 2006 Meet. Abstr. MA2005-01 234

[21] M. Dornbusch, T. Biehler, M. Conrad, A. Greiwe, D. Momper, L. Schmidt, M. Wiedow, Unusable Pretreatment of Steel and Zinc Surfaces Based on Phytic Acid, JUnQ, 6, 2, 1-7, 2016

[22] M. Weinert, J. Gutmann, M. Dornbusch, Hydrophobic Phytic Acid Conversion Layers for Corrosion Protection of Steel Surfaces, J. Coat. Technol. Res. 2024; https://doi.org/10.1007/s11998-023-00852-w

[23] DE102021102513A1

[24] DE102021123903A1

[25] M. Dornbusch, The use of modern electrochemical methods in the development of corrosion protective coatings, Prog. Org. Coat. 61 (2008) 240-244

[26] M. Dornbusch, M. Hickl, K. Wapner, L. Jandel, Corrosion protection mechanism of chromate-free coil coating systems, Millenium Steel 2008, 231-236

[27] M. Reichinger, W. Bremser, M. Dornbusch, Interface and volume transport on technical cataphoretic painting: A comparison of steel, hot-dip galvanised steel and aluminium alloy, Electrochim. Acta 231 (2017) 135-152

[28] M. Dornbusch, S. Kirsch, C. Henzel, C. Deschamps, S. Overmeyer, K. Cox, M. Wiedow, M. Dargatz, U. Meisenburg, Characterization of the Water Uptake and Electrolyte Uptake of Organic Coatings and the Consequences by Means of Electrochemical Impedance Spectroscopy and UV-VIS Spectroscopy, Prog. Org. Coat. 89 (2015), 332-343

[29] C. Langer, M. Dornbusch, Corrosion behavior of decorative chromium layer systems in concentrated aqueous electrolytes in: Proc. NACE Corrosion 2017, 166-170

[30] C. Langer, W. Wendland, K. Honold, L. Schmidt, J. Gutmann, M. Dornbusch, Corrosion Analysis of Decorative Microporous Chromium Plating Systems in Concentrated Aqueous Electrolytes, Engineering Failure Analysis 91 (2018) 255–274

[31] C. Langer, W. Wendland, K. Honold, L. Schmidt, J. Gutmann, M. Dornbusch, Klärung des spezifischen Korrosionsverhaltens von mikroporigen Chromüberzugssystemen in CaCl₂-Elektrolyten, BHM Berg- und Hüttenmännische Monatshefte, 163(7), 275-280

[32] P. Ohagen, J. S. Gutmann, M. Dornbusch, Surface characterization by confocal Raman spectroscopy: Phase differentiation of Zn-Mg alloys on industrial substrates, J. Failure Analysis and Prevention, 2026, accepted

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Lehrveranstaltungen

Literature

Research

Prof. Dr. Michael Dornbusch

Lacktechnologie Mitglied ILOC-Institut

Forschung

Prof. Dr. Michael Dornbusch

Lehrveranstaltungen

Literature

Research

Prof. Dr. Michael Dornbusch

Lacktechnologie Mitglied ILOC-Institut

Forschung

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