1.1 本规程涵盖了根据材料或产品规范的要求，通过将样品暴露在含有二氧化硫的冷凝水分中进行定性评估试验时使用的仪器和程序。 1.2 暴露条件可以改变以适应特定要求，本规程包括使用不同浓度二氧化硫的规定，以及连续或交替暴露于含二氧化硫的大气和环境大气的试验。 1.3 本规程未规定所用试验的变体、所需暴露时间、试样类型和失效标准。这些细节在适当的材料和产品采购规范中提供。 1.4 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。 1.5 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。 有关特定的警告语句，请参阅 4.3 。 1.6 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 含有二氧化硫的潮湿空气很快就会对许多金属产生明显的腐蚀，其形式类似于工业环境中的腐蚀。因此，它是一种非常适合检测保护涂层中的孔隙或其他薄弱来源以及与不合适的合金成分或处理相关的耐腐蚀性缺陷的测试介质。 3. 2. 试验中获得的结果不应被视为测试材料在所有可能使用这些材料的环境中耐腐蚀性的一般指南。试验中不同材料的性能只能作为这些材料在潮湿SO中相对耐腐蚀性的一般指南 2. 服务

1.1 This practice covers the apparatus and procedure to be used in conducting qualitative assessment tests in accordance with the requirements of material or product specifications by means of specimen exposure to condensed moisture containing sulfur dioxide. 1.2 The exposure conditions may be varied to suit particular requirements and this practice includes provisions for use of different concentrations of sulfur dioxide and for tests either running continuously or in cycles of alternate exposure to the sulfur dioxide containing atmosphere and to the ambient atmosphere. 1.3 The variant of the test to be used, the exposure period required, the type of test specimen, and the criteria of failure are not prescribed by this practice. Such details are provided in appropriate material and product purchase specifications. 1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.5 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. For a specific warning statement, see 4.3 . 1.6 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 Moist air containing sulfur dioxide quickly produces easily visible corrosion on many metals in a form resembling that occurring in industrial environments. It is therefore a test medium well suited to detect pores or other sources of weakness in protective coatings and deficiencies in corrosion resistance associated with unsuitable alloy composition or treatments. 3.2 The results obtained in the test should not be regarded as a general guide to the corrosion resistance of the tested materials in all environments where these materials may be used. Performance of different materials in the test should only be taken as a general guide to the relative corrosion resistance of these materials in moist SO 2 service.