1.1 本试验方法包括通过扫描电子显微镜（SEM）检查横截面来测量金属涂层厚度。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户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。 1.4 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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 本试验方法适用于直接测量金属涂层和复合涂层各层的厚度，尤其是比光学显微镜测量的厚度更薄的层。 4.2 该测试方法适用于验收测试。 4.3 本试验方法用于测量极小区域的涂层厚度，而不是平均或最小厚度本身。 4.4 这种测试方法的准确测量通常需要非常仔细的样品制备，尤其是在更大的放大倍数下。 4.5 涂层厚度是在役涂层性能的一个重要因素。

1.1 This test method covers the measurement of metallic coating thicknesses by examination of a cross section with a scanning electron microsope (SEM). 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 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 This test method is useful for the direct measurement of the thicknesses of metallic coatings and of individual layers of composite coatings, particularly for layers thinner than normally measured with the light microscope. 4.2 This test method is suitable for acceptance testing. 4.3 This test method is for the measurement of the thickness of the coating over a very small area and not of the average or minimum thickness per se. 4.4 Accurate measurements by this test method generally require very careful sample preparation, especially at the greater magnifications. 4.5 The coating thickness is an important factor in the performance of a coating in service.