Medical Electrical Motor sheet metal stamping part

Salt spray test is an environmental test which mainly uses artificial simulated salt spray environment conditions created by salt spray test equipment to examine the corrosion resistance of products or metal materials. It is divided into two categories, one is natural environment exposure test, the other is artificial accelerated simulated salt spray environment test. Artificial simulated salt spray environment test is a kind of test equipment with a certain volume space -- salt spray test chamber, in its volume space by artificial method, to create a salt spray environment to evaluate the corrosion resistance of products.

The protective effect of Dacro film on steel matrix can be summarized as follows:

1. Barrier effect: Due to the lamellar overlap of flake zinc and aluminum, it blocks the process of water, oxygen and other corrosive media reaching the matrix, which can act as a kind of isolation and shielding.

2. Passivation: In the process of dacro treatment, chromic acid reacts with zinc, aluminum powder and matrix metal to form a dense passivation film, which has good corrosion resistance.

3. Cathodic protection: the main protective effect of zn-Al-Cr coating is the same as that of galvanized layer, which is cathodic protection for the matrix.