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Thursday, December 6, 2007 - 9:00 AM
High Edge Coverage Electrocoat Development for Enhanced Corrosion Protection
Traditional cationic electrocoat technologies have been used on automotive bodies and parts since the mid 1970’s. The coatings impart superior corrosion resistance with the advantages of complete coverage of complex geometries, controllable deposited film thickness, low volatile organic content, and the high transfer efficiency characteristic of the electrodeposition process. Edge corrosion occurs due to the tendency of traditional primers to flow away from sharp edges, corners and high surface profile areas during the cure process, providing minimal protection. Increasing pigment content to restrict this flow away from edges provides very little improvement in corrosion protection while increasing surface roughness, dirt particle formation and reducing paint stability. Significant improvements in edge protection have been realized by controlling the rheology of the electrocoat paint during the cure process through the use of microgel resin technology. This approach to flow control achieves a significant increase in edge corrosion protection by keeping the deposited film from flowing away from sharp edges during cure with minimal increase in film roughness and no negative effects on paint stability. The development of this unique resin technology for electrodeposition coatings will be discussed along with various application examples.
See more of Paint Application
See more of The 2007 Tri-Service Corrosion Conference (December 3-7, 2007)
See more of The 2007 Tri-Service Corrosion Conference (December 3-7, 2007)