Letter 17079

PVD finishing problems  

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Hello

I work in a company that coats its products with PVD (brass color mainly) the problem is that we are using a PVD coating with Ti (metallic layer) and then ZrCN. When the parts come out of the chamber they seem OK, but after a few time they become foggy and loose glow! Is there any theoretical explanation for this? With the microscope I've been able to notest that the roughness of the parts is a little higher then what it should be...but at the same time it seems that the parts absorv water vapor!!

Can anybody give a litle help with this?

Best Regards

Pedro Santos
- AVEIRO - PORTUGAL

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