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45040
White wash deposit after chrome plating
[California]
May 6, 2007
What causes white wash deposit on wheels after chrome plating
aside from low ratio of Chromic acid to Sulfate concentrations in
Chrome solution?
Thank you.
Louie Rumbaugh
Lab Supervisor - Carson, California
Ed. note: Send a good photo to mooney@finishing.com if you can,
Louis. Maybe what you are calling 'white wash' someone else might
call haze (or maybe not).
May 8, 2007
If by deposit you mean a salt layer, will it wash off with DI
water? If it is and it has been baked on, it may take a very dilute
acid to get it off.
My guess is that it is a haze or milky plate which can also be caused
by the amperage either too high or too low for the tank temperature;
or another catalyst that you might be using being too low.
James Watts
- FL
May 12, 2007
Might we not be looking at a passive nickel problem, requiring
cathodic activation in acid or cyanide prior to chrome plating.

Geoff Whitelaw
- Port Melbourne, Vic., Australia
May 14, 2007
Try two simple fixes first -
1. Improve rinsing after nickel.
2. Let the part come to temperature for a short time after immersion
in the chrome solution before applying current.
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Jeffrey Holmes,
CEF
- Spartanburg, SC, USA
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