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-----Hard chromium plating is gray and rough
adv.
March 12, 2008
I am a student at Papua New Guinea doing Industrial Training with a company who are specialised in hard chroming of Hydraulic cylinders & rods...
I think there's something wrong because after plating, it gives us grayish and a rough looking surface.
What do you think is wrong?
Student - Papua, New Guinea
Guess one would be a high content of trash metal ions. A second guess would be plating at a wrong amperage for the tank temperature.
Step one would be to get an analysis of the tank, probably using an AAS
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- Navarre, Florida
March 14, 2008
Hi , sounds like you could be plating with excessive current - depending on size and shape of parts , the required current varies
.
e.g., , a simple shape part such as a rod , with a surface area of 20 sq" , I would plate at 2 amps per sq".
and a small part , such as a bolt with a surface area of 1 sq" I would plate at 1 amp sq "
Also , check your solutions are up to the correct temperature , and stirred after being topped up , as the parts will look grey and burnt if vat is too cold .
hope this helps
- Essex, UK
March 16, 2008
adv.
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