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Letter 5044
Hexavalent or Trivalent Chrome
?
.
We are running a plating on plastic line for A.B.S plastic. I am
in the process of looking at converting our hexavalent chrome bath to
a trivalent bath as I am led to believe the operating parameters are
wider, the chrome content is lower hence less dragout and the bath is
alround a lot more user and environmently friendly.
I would be interested in hearing some other opinions form anyone
who is running a trivalent chrome bath (ideally plating on plastic).
Any comments regarding pitfalls and potential problems would be
greatly appreciated .
Tim Strickland
- New Zealand
.
The operating parameters of a Trivalent chromium process are
similar to a bright nickel process than hexavalent chromium process.
You need to control temperature, pH and chromium metal and trace
metals, eg. Cu, Ni,Zn, more closely in the trivalent chromium
solution.
You stated the benefits of a trivalent electrolyte like lower
metal, lower drag out etc. the other benefit is no white washing from
passive nickel like you can see with hexchrome. The one disadvantage
of trivalent chromium is the color is slightly darker than the std.
hexavalent chromium deposit.
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