Manufacturing Industry
Pretreating zinc plated parts.(electrocoat clinic)
Products Finishing, December, 2005 by Jacob, Ron
Q. I would like to know your thoughts on the pretreatment of zinc plated parts prior to cathodic eleetrocoating. We have random defects (blistering after paint cure) and have tried to tie the defect to the zinc plating thickness, cleaning/zinc phosphate parameters with no luck. The current pretreatment system is alkaline clean (120 sec at 150[degrees]F), rinse, condition, zinc phosphate (90 sec at 110[degrees]F), e-coat and cure 20 min at 352[degrees]F. Thanks for your help. M.R.
A. I think you are looking in the right direction but it may not be the zinc plating itself but a clear sealer over the zinc plate. Most platers add a clear chromate sealer over their zinc plate. These clears are normally organic in nature and can/are removed with strong hot...
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