通过模拟闭塞腐蚀电池试验及室内间浸挂片试验,对常用的Ni-Cr系和Mn系两类低合金船体结构钢的耐点蚀性能作了比较。短期挂片的结果表明，Ni－Cr系钢的耐点蚀性能优于Mn系钢；而模拟长期挂片条件的闭塞电池试验结果则表明，Ni－Cr系钢的耐点蚀性能比Mn钢差。在涂层保护下，Ni-Cr系钢的点蚀诱发孕育时间比Mn系钢长很多。表现为实船使用中Ni-Cr钢的耐蚀性一直优于Mn系钢。
The pit corrosion resistances of nickel - chromium series low alloy structural hull steels were compared by simulating occluded corrosion cell test and interval laboratory immersion corrosion tests. The short - term immersion corrosion results showed that in early pit propagation stage, the rates of pitting propagation of nickel-chromium steels were slower than those of manganese steels.However,the results of the simulating occluded corrosion cell tests showed that the pitting resistance of nickel- chromium steels were lower than that of manganese steels when simulating long-term immersion corrosion test.However, pitting initiation stage of nickel- chromium steels with coating is much longer than that of manganese steels with coating. Therefore the resistance of nickel- chromium steels is bigger than that of maganese steels in practical use.
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