Stripping PVD Coating

Can you give me any suggestions for stripping the gold colored PVD? Alternately can the PVD layer be activated so gold can be plated over it?


Q. I have been asked to refinish a number of watchcases. They are gold colored and are made of stainless steel. The gold tone is due to a physical vapor deposition (PVD) process. Can you give me any suggestions for stripping the gold colored PVD? Alternately can the PVD layer be activated so gold can be plated over it? C.A.

 

A. The gold colored PVD coating is titanium nitride. It can be stripped from stainless steel using the following solution.
Hydrofluoric acid is nasty stuff to work with so use caution when working with this solution.

 

Component

Concentration

Hydrofluoric acid

1 part

Water

1 part


Another formulation that is reported to work well is as follows:



Component

Concentration

Hydrogen peroxide

1 part

Ammonium hydroxide

1 part

Water

1 part

 
This second formulation is less dangerous but again should be treated with respect.

 

I am not aware of any method for activating the PVD layer. Perhaps one of our readers has some insight into to this?

 

 

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