How to determine metal plating?

1 look at the appearance
The coating has the same color and fine crystal structure; the coating has no blistering, peeling, pinhole and charring; no obvious roughness and burrs; no obvious water marks and fingerprints.  cnc machining part
2 plating thickness
The thick plating of the main surface is in accordance with the contract requirements (no special contract or agreement can be implemented according to national standards and industry standards acceptable to both parties). plastic part
3 bonding force
If there is a requirement for bonding, the bonding force test shall be carried out according to the method agreed by both parties. After the test, the plating layer and the substrate shall not be delaminated, peeled off or peeled off. (The national standard lists more than 10 kinds of test methods such as friction polishing test, shot peening test and peel test bending test for different plating parts and coatings).
4 corrosion resistance
Test according to the test method and cycle agreed by both parties. (The test methods listed in the national standards are moisture test, salt spray test, acetate spray test, etc.).machined part