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Poor plating adhesion on steel



(-----) 2007

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

Garry Campbell
Project Engineer - Glenrothes Fife
^


2007

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, finishing.com
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 probert
Robert H Probert
Robert H Probert Technical Services
supporting advertiser
Garner, North Carolina
probertbanner
^


Second of three simultaneous responses -- 2007

Garry
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.

popat patel
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.

trevor crichton
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
^


2007

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.
Best regards

Janusz LABEDZ
- Warsaw, Poland
^

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