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How to detect the coating quality?

How to detect the coating quality?
The quality of the coating directly affects the service life of the neodymium iron boron.
The main method for the detection of the quality of Nd Fe B coating:
Visual appearance and measurement of coating thickness, drop (mainly for galvanized products), designated qualification tests (usually used in nickel plating products), thermal shock test, PCT pressure test, SST salt spray test, constant temperature and humidity test test.
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