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Electrochemical corrosion refers to the electrochemical process in which, due to differences in intermetallic electrode potentials, a battery is formed at the contact surface of dissimilar metals, resulting in the corrosion of the anodic metal. Measures to prevent electrochemical corrosion include: first, it is best to use the same metal material for the flow channels of the pump; second, a sacrificial anode should be used to protect the cathodic metal. For example, small, fragile components can be made of metals with a low electrical potential and used as the anode, while large, important components can be made of metals with a high electrical potential and used as the cathode. The anode metal will corrode first, thereby protecting the cathode metal. Uniform corrosion refers to the uniform chemical corrosion of the entire metal surface when a corrosive liquid comes into contact with it. This is the most common type of corrosion, and it is also the least harmful type. Measures to prevent uniform corrosion include using appropriate materials (including non-metals) and considering sufficient corrosion margin during the design of water pumps. Intergranular corrosion is a type of local corrosion that primarily refers to the precipitation of chromium carbide between the grains of stainless steel. Intergranular corrosion has a severe corrosive effect on stainless steel materials such as stainless steel submersible pumps or stainless steel self-priming pumps. Materials subjected to intergranular corrosion lose almost all of their strength and ductility. Measures to prevent intergranular corrosion are: annealing the stainless steel, or using ultra-low carbon stainless steel (C