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Letter 18067
Uneven CED coating of Stainless Steel
[Thailand]
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Our coating parts are made of stainless steel with not complex
shape. After CED coating some area have uneven film, it can see
clearly that film thickness is so different. I have checked and have
adjusted spray force of rinsing but no improvement. I would like to
know why it occur and how to do. Another question how can I improve
film adhesion of this substrate.
Thank you forward to your kind response.
John Stroker
- Thailand
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Frankly, it is difficult to answer without being able to examine
the problem. None the less, lets try. What do you mean my uneven - is
the DFT very different. Have you verified that using a good DFT
measuring instrument? Or do you have orange peel? Or does the film
have a texture?
It is difficult to have variable film thickness especially to the
extent that is is visible to naked eye. CED normally works +/- 2
microns.
Orange peel could be becuase of improper coating power supply.
Check the output from the rectifier.
A texture - pig skin effect could come from incorrect P/B value.
Hope this points you in the correct direction!
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