The pump structure should be reasonable, unreasonable organizational structure should be uniform often cause local stress caused by stress corrosion; chemical pump parts should be uniform, to prevent electrochemical corrosion; for large pump shaft and other parts of the heat treatment, eliminate residual stress, prevent stress corrosion, avoid corrosion fatigue. Stainless steel self priming pump

The metal protective layer can be divided into two kinds: the anode protection layer and the cathodic protection layer. The electrode potential, as an anode protective layer, is lower and stronger than the electrode potential of the protected metal. The protective effect of anodic protection layer is not protected with metal corrosion protection layer separated, but in the void and destruction, and protection of the protected metal corrosion cell formed between the metal, because the protection of the cathode corrosion cell, so can not be damaged. The protection performance of the anodic coating depends mainly on the thickness of the cover layer. The thicker the cover layer is, the better the protection effect is. For example, under certain conditions, zinc, cadmium and aluminum can be used as the anode protection layer of carbon steel.

The electrode potential of the cathodic protection layer is higher than the electrode potential of the protected metal, and the electrical property is weak. Such as iron tin, only in order to complete when the protective layer is very reliably used to prevent corrosion, the corrosive medium or through pore covering layer and the damage to the protected metal infiltration, the formation of micro cell corrosion and protection of metal anode, will suffer severe damage. Therefore, the protection performance of the cathode cover layer depends on the thickness and porosity of the cover layer. The thicker the cover layer is, the lower the porosity, the better the protection effect. In general, nickel, copper, lead and tin can be used as the cathodic protection layer of carbon steel.

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