Letter 41072

Zinc (trivalent) plating over zamak 5  

++++++

We are experiencing tiny blisters on our parts two to three days after they are plated. The parts looked fine immediately after the plating. What is causing the problem?

Jim Tou
MTI - Clarence, New York

Blisters can come from many different things. Typical is...
1) too much brightener or organics in the solution
2) bad pretreatment

It would be helpful to get more information on this problem.

1) What type of zinc solution are you using?
2) Is the zinc layer chromated or passivated?
3) Where on the parts is the blistering occuring?

TOM KIDD
CRC Specialist - Budapest, Hungary

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