The cooler is applied for cooling system of gear box, converter, converter cabinet, generator system, nacelle and so on from 0.8MW to 7MW. Choose anodic oxidation, electrophoresis treatment on cooler, Corrosion-proof grade:C5, passed test and begin bulk production, working well. At present, anodic oxidation treatment or electrophoretic processing is using for coolers for offshore wind power. Corrosivity resistant level: ISO12944 C3/ C4/C5-I/C5-M.