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topic 11268

Acid zinc pretreatment problem


 

When we electroplate steel parts in zinc acid, we always have a cleaning problem.

The steps are:

Electrocleaner
rinse,
HCl (50%)
rinse,
Zinc acid ,etc...

However we never get a clean part the first time around. If we strip the parts, and replate them in zinc they came out great. What are the proper steps to clean steel parts, prior to zinc acid plating. Thanks.

V.Dewis
- Florida


 

I think you need work according to following process:

Alkaline Cleaners
Electrocleaner
rinse,
HCl (50%)
rinse,
Zinc acid ,etc...

Efim Ruchman
- Israel


 

Your pretreatment sequence is not very robust, V. It may work for some parts some times, but not all parts all the time. You probably need at least a soak clean tank before the electrocleaning, and preferably a double cleaning cycle consisting of: soak clean, electroclean, acid pickle, electroclean, acid activate. Good luck.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



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