Corrosion Protection of Steel Structure in an Arctic Ocean by Stainless Steel
Akihiro Tamada, Masaharu Honda
There is a strong demand for corrosion protection measures of steel structures against severe corrosion, due to exposure in an arctic ocean. Corrosion resistance of stainless steel, SUS 329J1, was studied by electrochemical measurement and immersion test in order to apply to the most corrosive part of steel structures, the water line area. It was clarified that crevice corrosion and corrosion at welds covered with oxide film occurred on the stainless steel, irrespective of low temperatures near the freezing point. Stainless steel also causes considerable galvanic corrosion to carbon steel, especially at the part adjacent to the weld metal. By applying catholic protection to the dissimilar joints, both crevice corrosion on stainless steel and galvanic corrosion on carbon steel can be prevented to occur. Thus, it was concluded that a combination of stainless steel and catholic protection was useful measures.