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三、线性极化技术评定金属耐局部腐蚀性能的研究——“局部腐蚀指数δ”的初步探讨金属和合金在各种介质中表现的腐蚀状态有均匀腐蚀和局部腐蚀之分。严格说来,任何腐蚀都是不均匀腐蚀。所谓均匀腐蚀是指腐蚀状况的分布大体上是各处均匀的。对于很多腐蚀体系,常常会发生所谓局部腐蚀的现象,如点腐蚀,溃疡腐蚀,隙缝腐蚀,晶间腐蚀,水线腐蚀,选择性腐蚀,应力腐蚀,微生物腐蚀等。发生局部腐蚀时,腐蚀的总量往往是不大的,但危害极大。例如
Third, the linear polarization technology to assess the resistance to localized corrosion of the metal - the preliminary study of the “local corrosion index δ” Metal and alloy corrosion performance in a variety of media have a uniform corrosion and local corrosion points. Strictly speaking, any corrosion is uneven corrosion. The so-called uniform corrosion refers to the distribution of corrosion conditions are generally uniform everywhere. For many corrosion systems, so-called localized corrosion often occurs, such as pitting corrosion, ulcer corrosion, crevice corrosion, intergranular corrosion, water line corrosion, selective corrosion, stress corrosion, microbial corrosion and the like. Occurred in the local corrosion, the total amount of corrosion is often not large, but great harm. E.g