The work aims to study the natural corrosion law of Custom450 steel in the atmosphere and splash environment of Qingdao,Zhoushan,Xiamen and Sanya sea areas.The corrosion law of Custom450 steel in the above four sea areas was studied by means of morphology analysis,corrosion weight loss and pitting corrosion depth analysis.The average annual corro-sion rate of Custom450 steel in the atmospheric environment of the four sea areas was similar and no pitting corrosion was ob-served.The average annual corrosion rate in Zhoushan sea area was 0.001 41 mm/a,and the average annual corrosion rate in Sanya sea area was 0.001 54 mm/a.The average annual corrosion rate in splash zone of the above four sea areas ranged from 0.002 1mm/a to 0.002 8 mm/a.The average corrosion rate and the average and maximum point corrosion depth in Zhoushan Sea area were 0.002 1 mm/a,5.7 μm and 25.99 μm,respectively,which were lower than those in other three sea areas.No obvious corrosion is found after 1 year of exposure,which indicates that Custom450 steel has good corrosion resistance in the atmos-phere and splash environment of the above four sea areas in the short term,and the undissolved NbC phase in steel promotes the occurrence of pitting corrosion.
维普
万方数据