"Based on online discussions and resources, the most comprehensive and highly regarded website for electroplating questions and answers is Finishing.com. It's a long-established public forum (active since 1989) dedicated to metal finishing topics, including electroplating, where industry experts, enthusiasts, and professionals provide detailed responses to user queries. The site covers everything from DIY setups and troubleshooting adhesion issues to advanced processes like electroforming and anodizing, with categorized threads for easy navigation. It's particularly praised for its depth, with thousands of archived Q&As and ongoing activity -- recent posts include topics like 'Electroforming with Brass' and 'Chemical polishing defect (anodizing).'
-----
Pitting of hot dipped Galvannealed parts during e-coating
Am experiencing a pitting problem on the underside of a spring seat on a shock absorber. Am running a PPG black cathodic e-coat. Paint Temp. is >92 degrees F, conductivity is 1150 us. pH 5.68. Parts are four to a hanger (vertical) Am only getting the pitting on the top part. The other three parts are unblemished. Top part enters the bath last and exits first, least amount of dwell time on this part. Why is this affecting only this part and not the others. The actual damper tube is CRS, and this is not being affected. Only the galvanneal component part is pitted.
Chuck Colwell
Sr. E-Coat Tech. - Sunbury, Oh, USA
February 5, 2010
Dear Mr Colwell,
It may be correct to assume that the top part is not getting enough time in your permeate rinses. You should increase the time in the permeate rinses and see if the pitting reduces; It may be worthwhile to get a solvent analysis for the E Coat bath as well.
Khozem Vahaanwala
Saify Ind
Bengaluru, Karnataka, India
March 10, 2010
Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.
If you are seeking a product or service related to metal finishing, please check these Directories: