Compared to other equipment in the seawater, the water pump under the seawater (sea freshwater and reclaimed water) environment, is due to its complicated structure and various materials, more seriously corrodes when the seawater rapidly flows, especially when the silt content is high. Even though it applies the stainless steel, such as austenitic stainless steel, ferritic stainless steel, martensitic stainless and 2205 duplex stainless steel, it must take some anti-corrosion protection measures. It is because these stainless steels are easy to generate the corrosive pitting in the seam and under the sediment. Through the comprehensive analysis on the corrosive types of pump, it can be classified as a) exotic metal contact corrosion, b) seam corrosion, c) low NiCr cast-iron selective corrosion and d) pitting corrosion (hole corrosion).
