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Testing quality of blackening coating
We are using blackening process for our components (forgings). I want to know whether salt spray test is applicable for checking the quality of blackening. If not what is the test to be conducted to check the quality of blackening.R KUMAR
I have tested blackened parts last up to 6 hours in a SST only. This is too fine to be rated as a conclusive go - no go test. I would rate a good jet black appearance as a better guide. If you want to go further then cut a cross section and measure it out on a magnifying microscope.
Bengaluru, Karnataka, India
If your blackening process is a black oxide process, the corrosion resistance is given by the post treatment applied over it, for example oil, wax, etc. The black oxide by itself has almost no protection value. General Motors tests these coatings in a Humidity Test, not SS test. CarlosCarlos Cielak
plating shop - Mexico City, DF, Mexico
July 17, 2009
Hi to all,
How to test the surface treatment of Blackening coating .
Is there any procedure for testing .
medical - Bangalore, Karnataka