An excellent "220V Cooling Fan" designed to extend equipment life, to ensure the safety of the equipment, the structure design, the most likely accelerated corrosion design flaw is the tendency of stress concentration and crannies environment, sometimes despite the metal impregnation solution, the corrosion rate than small; but the formation of a gap, since "220V Cooling Fan" chemical and electrochemical state of the internal solution has changed, it will cause severe crevice corrosion. The election of the centrifugal fan material is very important because different materials and separation requirements, the need to use different models. After the model and the main parameters are established, depending on the material corrosion in different environments can be integrated its physical and chemical characteristics, cost and other factors, to determine the strength of the parts and materials from the fundamentals. From "220V Cooling Fan" material itself, which is aimed at the target material is safe.