UV-stable electrocoats for corrosion protection and structural bonding
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UV-stable electrocoats for corrosion protection and structural bonding Christina Bauder , Ulrich Christ, Nadine Go¨ttl, Rolf Nothhelfer-Richter
Ó American Coatings Association 2019 Abstract The coating process in the industry segment of mobile machinery for ACE, e.g., agricultural machines, is usually done by spray application after welding a variety of parts on the framework. The current painting process consists of an anticorrosive primer and a weather-resistant topcoat. The presented study is part of a research project investigating a new concept combining a new sequence in construction with the big advantage of applying a single-coat system. This smart production enables the construction of machines in modules, keeps the volume of an electrocoating dipping bath at a minimum level, and replaces the custom painting procedure with much overspray by an economic and ecological coating technology. To realize this new technology, the coating system has to perform as an anticorrosive system, providing a sufficient outdoor weather resistance, and must have sufficient adhesion strength for structural bonding of additional parts. First results show that the investigated electrocoats show good anticorrosive properties. The UV- and the weather resistance meet the required values (> 50% gloss retention after 1000 h artificial weathering of CAM 180), dependent on the This paper was presented at the 2018 European Technical Coatings Congress on June 26–29, 2018, in Amsterdam, The Netherlands. C. Bauder (&), U. Christ, N. Go¨ttl, R. Nothhelfer-Richter Department Coating Systems and Painting Technology, Fraunhofer Institute for Manufacturing Engineering and Automation IPA, Stuttgart, Germany e-mail: [email protected] U. Christ e-mail: [email protected] N. Go¨ttl e-mail: [email protected] R. Nothhelfer-Richter e-mail: [email protected]
type of electrocoat. First investigations on structural bonding show that a high bonding strength can be achieved. Keywords Electrocoats, Corrosion protection, Adhesion, Weather resistance, Structural bonding
Introduction Agricultural and construction equipment (ACE) is often painted with company-specific identifying color shades.1,2 Besides the decorative effect, the most important function is the protection of the constructions against corrosion. As the ACE is a huge construction, the painting process of the whole unit is difficult as the welded framework is a combination of a variety of functional parts with complex geometries.1 State of the art is joining all parts of the steel structure of the ACE first and painting it afterward. The standard coating process consists of the application of a pretreatment layer, an anticorrosive primer, and a weather-resistant colored topcoat by spray application.2,3 As mentioned, it is complicated to paint the complex geometries of ACE sufficiently. Therefore, coating defects arise from various latent failure zones derived from deficient coating.4 Typical defects via conventional spray application are insuf
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