How to detect the quality of coatings

How to detect the quality of coatings
Time:2016-12-03 From:
It will affect the working life whether the coating is stand or fall.
 
The main detections are as follows:
 
Visual inspection. Check the thickness of coatings. Drop test (mainly among the Zinc plated products), crosscut test (mainly among the Nickel plated products), PCT test, SST salt spray test, constant temperature and humidity test etc.
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