1.1这些试验方法涵盖了在百万分之一范围内测定隔热材料中水溶性氯化物、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、所需设备的可用性以及萃取溶液中离子浓度的适当性，选择所需离子测定的一种试验方法。 1.3本标准无意解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 已经证明，当氯化物沉积并集中在奥氏体不锈钢表面时，会导致外部应力腐蚀开裂（ESCC）。 5. 由于试验方法C 871是 “ 源文档 ” 对于需要测试可浸出氟离子的其他标准。 测试 6. 已经表明，使用测试方法C 692的方法 ，氟化物、碘化物和溴化物都不会以氯化物可以证明的方式引发ESCC。按照试验方法C 692中的金属鉴定程序的要求，在暴露于1500 mg/kg氟化物中60天后，没有开裂，改为1500 mg/kg氯化物会在3天内导致开裂 . 用碘化物和溴化物进行的类似试验表明，这些离子不像氯化物那样促进ESCC。 氯化物（和氟化物）可以是绝缘材料或环境的成分，也可以是两者的成分。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。 已发现，绝缘中存在的钠和硅酸盐离子可抑制氯化物（和氟化物）离子引起的外部应力腐蚀开裂，无论此类离子是来自绝缘本身还是来自外部。 此外，如果钠和硅酸盐离子与氯化物（和氟化物）离子的比率在绝缘中处于一定比例，则由于绝缘中存在氯化物（和氟化物）而导致的外部应力腐蚀开裂将得到防止或至少得到缓解（另见规范C 795） ).

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 in the extraction solution. 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== It has been demonstrated that chlorides, when deposited and concentrated on the surface of austenitic stainless steel, can contribute to external stress corrosion cracking (ESCC). 5 Analysis for fluoride has been covered because Test Methods C 871 is the “ source document ” for other standards that require testing for leachable fluoride ions. Testing 6 has shown that, using the methodology of Test Method C 692 , neither fluoride nor iodide nor bromide initiates ESCC in the manner that can be demonstrated with chloride. After being exposed to 1500 mg/kg fluoride for 60 days with no cracking, a change to 1500 mg/kg chloride resulted in cracking in 3 days, as required by the metal qualification procedure in Test Method C 692 . Similar tests with iodide and bromide showed that these ions do not promote ESCC as does chloride. 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. 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 C 795 ).