1.1 本试验方法涵盖了表征高强度铝合金锻造产品抗应力腐蚀开裂（SCC）的统一程序，以指导进行应力腐蚀试验的人员、编制应力腐蚀规范的人员和材料工程师。 1.2 本试验方法包括取样方法、试样类型、试样制备、试验环境和确定2XXX（1.8%至7.0）SCC敏感性的暴露方法 % 铜）和7XXX（含0.4%至2.8 % 铜）铝合金产品，特别是当在相对于晶粒结构的短横向方向上受力时。 1.3 以国际单位制表示的值应视为标准值。SI单位后括号中给出的值仅供参考，不视为标准值。 1.4 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建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 3.5 % NaCl溶液交替浸入试验提供了一种测试环境，用于检测在自然室外环境中，特别是有海洋影响的环境中可能易受SCC影响的材料。 3. , 4. , 5. 为了确定材料的实际可用性，应在与最终用途相关的条件下，在预期使用环境中进行其他应力腐蚀试验，包括保护措施。 4.2 虽然该试验方法适用于某些合金类型，主要用于在短横向应力方向上测试产品，但该方法适用于其他类型的合金和应力方向。

1.1 This test method covers a uniform procedure for characterizing the resistance to stress-corrosion cracking (SCC) of high-strength aluminum alloy wrought products for the guidance of those who perform stress-corrosion tests, for those who prepare stress-corrosion specifications, and for materials engineers. 1.2 This test method covers method of sampling, type of specimen, specimen preparation, test environment, and method of exposure for determining the susceptibility to SCC of 2XXX (with 1.8 % to 7.0 % copper) and 7XXX (with 0.4 % to 2.8 % copper) aluminum alloy products, particularly when stressed in the short-transverse direction relative to the grain structure. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.4 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. 1.5 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 ====== 4.1 The 3.5 % NaCl solution alternate immersion test provides a test environment for detecting materials that would be likely to be susceptible to SCC in natural outdoor environments, especially environments with marine influences. 3 , 4 , 5 For determining actual serviceability of a material, other stress-corrosion tests should be performed in the intended service environment under conditions relating to the end use, including protective measures. 4.2 Although this test method is intended for certain alloy types and for testing products primarily in the short-transverse stressing direction, this method is useful for some other types of alloys and stressing directions.