1.1 本规程涵盖了测试和测量由维护或生产化学品引起的飞机金属和合金的晶间腐蚀（IGA）和端部晶粒点蚀的程序。 1.2 本标准并不旨在解决所有鉴定测试参数、方法、关键测试或飞机生产或维护化学鉴定标准。采购规范、材料规范、适当的工艺规范或先前商定的规范中应包含具体要求和验收测试以及相关验收标准。 1.3 单位- 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 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 如果没有经过适当的鉴定，化学品和化学工艺可能会腐蚀飞机维护和生产过程中使用的金属。重要的是，仅鉴定对飞机金属表层、配件、部件和结构没有任何有害影响的工艺和化学配方。本试验程序用于检测和测量飞机维护化学工艺引起的晶间腐蚀或点蚀深度，因此，本试验程序可用于选择不会在飞机合金上引起晶间腐蚀和端部晶粒点蚀的工艺。 4.2 本规程的目的是帮助鉴定或工艺一致性测试或生产飞机上使用的维护化学品。 4.2.1 生产环境中的实际飞机工艺应给出最具代表性的结果；然而，测试结果不能完全根据环境条件进行评估，环境条件通常每天都在变化。此外，当测试需要稀释的化学品时，水质和成分可能会影响腐蚀速率和影响结果的机制。 4.2.2 维护和生产化学品的一些例子包括: 有机溶剂、脱漆剂、清洁剂、脱氧剂、水基或半水基清洁剂，或蚀刻溶液和化学研磨溶液。

1.1 This practice covers the procedures for testing and measuring intergranular attack (IGA) and end grain pitting on aircraft metals and alloys caused by maintenance or production chemicals. 1.2 The standard does not purport to address all qualification testing parameters, methods, critical testing, or criteria for aircraft production or maintenance chemical qualifications. Specific requirements and acceptance testing along with associated acceptance criteria shall be found where applicable in procurement specifications, materials specifications, appropriate process specifications, or previously agreed upon specifications. 1.3 Units— The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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 If not properly qualified, chemicals and chemical processes can attack metals used during aircraft maintenance and production. It is important to qualify only processes and chemical formulas that do not have any deleterious effects on aircraft metallic skins, fittings, components, and structures. This test procedure is used to detect and measure intergranular attack or pitting depth caused by aircraft maintenance chemical processes, hence, this test procedure is useful in selecting a process that will not cause intergranular attack or end grain pitting on aircraft alloys. 4.2 The purpose of this practice is to aid in the qualification or process conformance testing or production of maintenance chemicals for use on aircraft. 4.2.1 Actual aircraft processes in the production environment shall give the most representative results; however, the test results cannot be completely evaluated with respect to ambient conditions which normally vary from day to day. Additionally, when testing chemicals requiring dilutions, water quality and composition can play a role in the corrosion rates and mechanism affecting the results. 4.2.2 Some examples of maintenance and production chemicals include: organic solvents, paint strippers, cleaners, deoxidizers, water-based or semi-aqueous cleaners, or etching solutions and chemical milling solutions.