1.1 本试验方法涵盖了黑色金属紧固件组件的部件，不包括不锈钢部件，如用于低坡度屋面和防水的紧固件、应力板和板条，以及亚硫酸环境。本试验方法通过测定生锈或白锈的百分比来评价部件的相对耐腐蚀性。 1.2 所述部件可以进行表面处理，也可以不进行表面处理。 1.3 一个限制因素是确定生锈或白锈腐蚀的实际百分比时的主观性。 1.4 该方法不评估黑色金属部件的其他性能特征，例如阻隔涂层的耐磨性。 1.5 本试验方法是在实践的基础上制定的 G87 . 1.6 以SI单位或英寸表示的值-英镑单位应单独视为标准单位。每个系统中陈述的值可能不完全等同；因此，每个系统应独立使用。合并两个系统的值可能导致不符合标准。 1.7 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。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法规限制的适用性。 1.8 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《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 评估低坡度屋面和防水中使用的黑色金属部件的耐腐蚀性非常重要，因为它们提供了其他系统部件（如绝缘材料和膜）的完整性和安全性。黑色金属部件的腐蚀可能导致其早期劣化，并可能导致屋面或防水系统故障。 5.2 在酸性气氛中测试黑色金属部件的结果用作这样的部件(涂覆或未涂覆)对测试室环境的相对耐腐蚀性的指示。这些结果不应被解释为此类部件在可能有利于腐蚀的其他环境或使用中的耐腐蚀性的一般指南。 5.3 含有二氧化硫的潮湿空气会很快对许多黑色金属产生明显的腐蚀。因此，它是一种适合于检测保护性屏障涂层中的孔隙或其它弱点来源的测试介质。 5.4 本试验方法主要适用于评价阻隔涂层在试验条件下提供一般腐蚀保护的有效性。它不打算评估组件对特定腐蚀机制（如缝隙腐蚀、电偶腐蚀或应力腐蚀）的抵抗力。 5.5 当紧固件穿过屋顶平台部件（例如现有的组合屋顶或绝缘材料或两者）上方时，该测试方法没有解决屏障涂层的耐磨性。 5.6 仅评估采用该试验方法的紧固件的上述甲板部分。

1.1 This test method covers components of ferrous metal fastener assemblies, excluding those of stainless steel, such as fasteners, stress plates, and batten bars used in low-slope roofing and waterproofing, to a sulfurous acid environment. This test method evaluates relative corrosion resistance of the components by determination of percentage of rust or white rust. 1.2 The components may or may not have a surface treatment applied. 1.3 A limiting factor is the subjectiveness when determining actual percentage of rust or white rust corrosion. 1.4 Other performance characteristics of ferrous metal components such as abrasion resistance of barrier coatings are not evaluated in this method. 1.5 This test method was developed based on Practice G87 . 1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.7 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. 1.8 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 It is important to evaluate the corrosion resistance of ferrous metal components used in low-slope roofing and waterproofing because they provide integrity and securement of other system components, such as insulation and membranes. Corrosion of ferrous metal components may result in their early deterioration and may lead to roofing or waterproofing system failure. 5.2 Results from testing ferrous metal components in an acidic atmosphere serve as an indication of the relative corrosion resistance of such components, coated or uncoated, to the environment of the test chamber. The results are not to be construed as a general guideline to the corrosion resistance of such components in other environments or in usage that may be conducive to corrosion. 5.3 Moist air containing sulfur dioxide quickly produces easily visible corrosion on many ferrous metals. It is therefore a test medium suited to detect pores or other sources of weakness in protective barrier coatings. 5.4 This test method applies primarily to evaluating the effectiveness of barrier coatings to provide general corrosion protection under test conditions. It is not intended to evaluate the resistance of the components to specific corrosion mechanisms such as crevice, galvanic, or stress corrosion. 5.5 This test method does not address abrasion resistance of barrier coatings when the fasteners are driven through above roof deck components, such as an existing built-up roof or insulations, or both. 5.6 Only the above deck portion of fasteners subjected to this test method is evaluated.