Fasteners generally need to undergo surface treatment, fasteners surface treatment of a lot of types, commonly used electroplating, oxidation, phosphating, non-electrolytic zinc coating treatment. However, electroplated fasteners occupy a large proportion in the actual use of fasteners. Especially in the automobile, tractor, home appliances, instruments and meters, aerospace, communications and other industries and fields used more widely. However, for threaded fasteners, the use of not only requires a certain anti-corrosion ability, but also must ensure the interchangeability of the thread, in this case can also be called the screw. In order to meet the requirements of "anti-corrosion" and "interchange" performance of threaded fasteners in use, it is necessary to develop special electroplating standards.

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