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Poor plating adhesion on steel
Can anybody help when you get a problem that the plating peels away from mild steel material.
The plating is Zinc And clear then the part gets masked then powder painted when we peel the masking off the plating is coming away as well
Project Engineer - Glenrothes Fife
Although there are a few possibilities, the most likely is simply that the parts aren't clean. Are you familiar with the term "waterbreak-free" and the way to observe it and test for it, Garry? Tell us how much you know and we'll try to start from there.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
First of three simultaneous responses -- 2007
Another possibility is that the steel is "leaded" AND THAT REQUIRES A SPECIAL PREPARATION. Chlorides and sulfates form insoluble salts on the surface. Use 30%/vol Fluoboric Acid and stay out of Hydrochloric and Sulfuric.
Robert H Probert
Robert H Probert Technical Services
Garner, North Carolina
Second of three simultaneous responses -- 2007
YOU HAVE PEELING PROBLEM.MOST OF PROBLEM TO CLEANING
TRY TO CLEAN YOUR STEEL PARTS SOAK THEN ELECTROCLEAN AND 30-40% HYDROCHLORIC ACID DIP AND RINSE AFTER ELECTRO CLEAN AND HYDROCHLORIC ACID THEN PLATE ZINC.
Popatbhai B. Patel
electroplating consultant - Roseville, Michigan
Third of three simultaneous responses -- 2007
Sounds like the steel is either not cleaned or properly prepared correctly. Please supply full process details, including bath compositions and operating conditions, then a more comprehensive answer can be given.
R&D practical scientist
Chesham, Bucks, UK
Let us know what kind of zinc bath you use. If acid one the reason is rather simple: wrong pretreatment (presume the base metal is mild non-alloy steel). If alkaline - there are lots reasons.
- Warsaw, Poland