1.1 本试验方法包括进行循环动电位极化测量的程序，以确定铁、镍或钴基合金在氯化物环境中对局部腐蚀（点蚀和缝隙腐蚀）的相对易感性。该测试方法还描述了一种实验程序，可用于检查一个人的实验技术和仪器。 1.2 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 3.1 在该试验方法中，阳极电流快速增加时的电位表示局部腐蚀的敏感性。在该测试中以固定扫描速率获得的该电势越高，合金就越不容易引发局部腐蚀。本试验的结果并不旨在以定量的方式与发生局部腐蚀时在使用中可能观察到的传播速率相关联。 3.2 一般来说，一旦开始，局部腐蚀可以在比磁滞回线完成时更正电的电势下传播。在该测试方法中，以固定的扫描速率确定完成磁滞回线的电势。在这些情况下，磁滞回线完成时的电势越正电，发生局部腐蚀的可能性就越小。 3.3 如果遵循该测试方法，则该测试方法将提供循环动电位阳极极化测量，该测量将再现其他实验室在其他时间使用该测试方法对中讨论的两种特定合金开发的数据 3.4 该程序用于氯化物环境中的铁基、镍基或钴基合金。 3.4 包括标准的动电位极化图。这些参考数据基于遵循标准程序的五个不同实验室的结果，使用304型不锈钢UNS S30400和C-276合金UNS N10276的特定合金。 3. 包括使用统计分析构建的曲线，以指示极化曲线的可接受范围。 3.5 标准测试方法、标准材料和标准图的可用性应使研究人员易于检查其技术，以评估对局部腐蚀的易感性。

1.1 This test method covers a procedure for conducting cyclic potentiodynamic polarization measurements to determine relative susceptibility to localized corrosion (pitting and crevice corrosion) for iron-, nickel-, or cobalt-based alloys in a chloride environment. This test method also describes an experimental procedure which can be used to check one's experimental technique and instrumentation. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 3.1 An indication of the susceptibility to initiation of localized corrosion in this test method is given by the potential at which the anodic current increases rapidly. The more noble this potential, obtained at a fixed scan rate in this test, the less susceptible is the alloy to initiation of localized corrosion. The results of this test are not intended to correlate in a quantitative manner with the rate of propagation that one might observe in service when localized corrosion occurs. 3.2 In general, once initiated, localized corrosion can propagate at some potential more electropositive than that at which the hysteresis loop is completed. In this test method, the potential at which the hysteresis loop is completed is determined at a fixed scan rate. In these cases, the more electropositive the potential at which the hysteresis loop is completed the less likely it is that localized corrosion will occur. 3.3 If followed, this test method will provide cyclic potentiodynamic anodic polarization measurements that will reproduce data developed at other times in other laboratories using this test method for the two specified alloys discussed in 3.4 . The procedure is used for iron-, nickel-, or cobalt-based alloys in a chloride environment. 3.4 A standard potentiodynamic polarization plot is included. These reference data are based on the results from five different laboratories that followed the standard procedure, using specific alloys of Type 304 stainless steel, UNS S30400 and Alloy C-276, UNS N10276. 3 Curves are included which have been constructed using statistical analysis to indicate the acceptable range of polarization curves. 3.5 The availability of a standard test method, standard material, and standard plots should make it easy for an investigator to check his techniques to evaluate susceptibility to localized corrosion.