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topic 9442

EN activation


I have been asked to deposit hard chrome (.000050-.0001) over an electroless nickel surface (.015-.020) which has been post baked @400F (returned to the mfg.) then diamond turned. It must be a "clear" (no discoloration/cloudiness) coating... Any ideas outside of a cathodic, sulphuric activation?

Richard Newman
- Frankfort, Illinois


Since you are going to plate in Cr you could activate the part in the chrome solution by applying just enough current to give the part a hydrogen wash but not enough current to plate any Cr. After the wash just ramp up the current to plate.

George Shahin
George Shahin
Atotech - Rock Hill, South Carolina

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