金属和合金的腐蚀.利用双环法进行电化学电动势活化测量

[中文适用范围]： 本国际标准规定了使用双环电化学电位再活化（DL-EPR）测试（基于 Cihal 方法）测量不锈钢和镍基合金中敏化程度（DOS）的方法。 该方法可用于定量评估导致在晶界或基体中形成合金元素贫化区的有害热效应。 然而，在测试热影响焊接区时应注意，因为敏化区沿熔合线可能分布不均匀。 测试结果可作为识别不锈钢和镍基合金对晶间腐蚀、点蚀和晶间应力腐蚀开裂潜在敏感性的指标，但这些腐蚀模式的预测取决于补充的具体测试。 本国际标准描述了一般方法，并在附录 C 中给出了特定合金的适当测试暴露条件的示例。 [外文原描述]： ISO 12732:2006 specifies the method for measuring the degree of sensitization (DOS) in stainless steel and nickel-based alloys using the Double Loop Electrochemical Potentiokinetic Reactivation (DL-EPR) test (based on Cihal's method). The method may be used for the quantitative assessment of deleterious thermal effects resulting in the formation of alloy-element-depleted zones at grain boundaries or in the matrix. However, attention should be paid when testing heat-affected weld zones, due to possible non-uniform distribution of sensitized zones along the fusion lines. The results of the test can be used as an index to identify the potential susceptibility of stainless steel and nickel-based alloys to intergranular corrosion, pitting corrosion, and intergranular-stress corrosion cracking, but prediction of these corrosion modes depends on complementary specific testing. ISO 12732:2006 describes the general methodology and gives examples of suitable test exposure conditions for specific alloys.