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通过对碳钢3C、碳锰钢902、903、SM53C和镍铬钢CXJI-4、921、5Ni钢电化学性能的测试表明,镍铬钢的腐蚀电位比碳钢和碳锰钢的腐蚀电位高40～80毫伏。腐蚀电位不同的船体钢偶联腐蚀试验表明,腐蚀电位相差40毫伏左右的船体钢偶联,在海水介质中能产生电偶腐蚀,腐蚀电位差增大,电偶效应也增大。由于碳锰钢腐蚀电位较负,加之碳锰钢的坑点腐蚀倾向大,结果造成腐蚀穿孔,危害较大。
The tests on the electrochemical properties of carbon steel 3C, carbon-manganese steel 902,903, SM53C and Ni-Cr steel CXJI-4,921,5Ni steel show that the corrosion potential of Ni-Cr steel is higher than that of carbon steel and carbon-manganese steel 40 ~ 80 millivolts. Coupling experiment of steel with different corrosion potentials shows that galvanic corrosion can occur in hull medium with corrosion potentials of about 40 millivolts. The corrosion potential difference increases and the galvanic effect increases. As the carbon-manganese steel corrosion potential is more negative, combined with carbon-manganese steel pit corrosion tendency, resulting in corrosion perforation, more harmful.