1.1 这些试验方法涵盖了测定隔热材料中百万分率范围内的水可浸出氯化物、氟化物、硅酸盐和钠离子的实验室程序。 1.2 应根据实验室能力和所需设备的可用性以及离子浓度的适宜性以及提取溶液中任何可能的离子干扰，选择所列的每种离子测定的测试方法之一。 1.3 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.4 本标准并非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。 1.5 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====== 5.1 研究表明，除卤离子外，氯离子；当氟离子沉积并集中在奥氏体不锈钢表面时，在没有抑制离子的情况下，会导致外应力腐蚀开裂（ESCC）。 5. ESCC特有的两种广泛使用的绝缘规范允许使用相同的测试方法 C692 以及C871用于绝缘材料的评估。这两个规范都要求在评估可提取离子时，氟离子应包含在氯离子中。 5.2 氯化物（和氟化物）可以是绝缘材料或环境的成分，或两者兼而有之。绝缘层中或环境中的水分会导致氯化物（和氟化物）通过绝缘层迁移，并集中在高温不锈钢表面。 5.3 已经发现，绝缘材料中存在的钠离子和硅酸盐离子可以抑制氯（和氟）离子引起的外部应力腐蚀开裂，无论这些离子来自绝缘材料本身还是外部来源。 此外，如果钠离子和硅酸盐离子与氯离子（和氟离子）的比例在绝缘层中达到一定比例，则将防止或至少减轻由于绝缘层中存在氯离子（或氟化物）而导致的外部应力腐蚀开裂（另见规范 C795 )。

1.1 These test methods cover laboratory procedures for the determination of water-leachable chloride, fluoride, silicate, and sodium ions in thermal insulation materials in the parts per million range. 1.2 Selection of one of the test methods listed for each of the ionic determinations required shall be made on the basis of laboratory capability and availability of the required equipment and appropriateness to the concentration of the ion and any possible ion interferences in the extraction solution. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that 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 ====== 5.1 Research has demonstrated that in addition to the halide ion chloride; fluoride ions, when deposited and concentrated on the surface of austenitic stainless steel, can contribute to external stress corrosion cracking (ESCC) in the absence of inhibiting ions. 5 Two widely used insulation specifications that are specific to ESCC allow the use of the same Test Methods C692 and C871 for evaluation of insulation materials. Both specifications require fluoride ions to be included with chloride ions when evaluating the extractable ions. 5.2 Chlorides (and fluorides) can be constituents of the insulating material or of the environment, or both. Moisture in the insulation or from the environment can cause chlorides (and fluorides) to migrate through the insulation and concentrate at the hot stainless steel surface. 5.3 The presence of sodium and silicate ions in the insulation has been found to inhibit external stress corrosion cracking caused by chloride (and fluoride) ions, whether such ions come from the insulation itself or from external sources. Furthermore, if the ratio of sodium and silicate ions to chloride (and fluoride) ions is in a certain proportion in the insulation, external stress corrosion cracking as a result of the presence of chloride (and fluoride) in the insulation will be prevented or at least mitigated (see also Specification C795 ).