1.1 本试验方法包括使用X射线荧光（XRF）测定钢板上金属涂层的涂层重量[质量]。该测试方法旨在用于连续生产线上涂层的“在线”测量，包括X射线管和同位素涂层重量[质量]设备的程序。在本试验方法正文中，提及的锌涂层应解释为也包括锌合金涂层，除非另有明确规定。 1.2 本试验方法适用于以下ASTM规范涵盖的涂层: A463/A463M , A599/A599M , A623型 , A623M , A653/A653M , A792/A792M , A875/A875M , A879/A879M , A918型 , A924/A924M , A1046/A1046M , A1063/A1063M 和 A1079号 . 1.3 单位- 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。 每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 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。 1.5 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====== 5.1 本试验方法通过使用X射线荧光（XRF）或同位素测量仪器，提供了一种标准方法，用于“在线”测定连续生产线上生产的钢板涂层的重量[质量]，以与规范要求进行比较，以及评估此类产品是否符合采购订单或合同中买方指定的ASTM A05委员会及其子委员会管辖下的材料规范。如果涂层和基材的元素性质与XRF的技术方面兼容，例如系统的吸收系数、一次辐射、荧光辐射、检测类型，则其可能适用于其他涂层。 5.1.1 本试验方法通过重复检测多个定义的单点数据点的荧光辐射来确定涂层厚度，从中可以确定重量[质量]，并可供其他ASTM委员会和其他标准编写机构用于一致性测试。 5.1.2 测试时的材料条件、采样频率、样本位置和方向、报告要求和其他测试参数包含在相关材料规范或特定产品形式的一般要求规范中。 5.1.3 钢板上的锌涂层提供防腐保护。由于保护是通过牺牲锌损失提供的，因此保护程度与锌涂层的重量[质量]成比例。镀锌钢板规范经常提供不同的涂层名称，以便买方可以选择最适合预期应用的涂层重量[质量]。 5.2 参考相关材料规范，了解用于表征涂层板材生产线线圈上涂层重量[质量]的程序。

1.1 This test method covers the use of X-ray fluorescence (XRF) for determining the coating weight [mass] of metallic coatings on steel sheet. The test method is intended to be used for “on-line” measurements of coating on continuous production lines and includes procedures for both X-ray tube and isotope coating weight [mass] equipment. In the body of this test method, reference to zinc coating shall be interpreted to also include zinc alloy coating except where specifically stated otherwise. 1.2 This test method is applicable to the coatings covered by the following ASTM Specifications: A463/A463M , A599/A599M , A623 , A623M , A653/A653M , A792/A792M , A875/A875M , A879/A879M , A918 , A924/A924M , A1046/A1046M , A1063/A1063M , and A1079 . 1.3 Units— The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 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 This test method provides a standard method, by the use of X-ray fluorescence (XRF) or isotope measuring instruments, for “on-line” determination of the weight [mass] of coatings on steel sheet produced on continuous production lines, for comparison with specification requirements, and for evaluating conformance of such products to a material specification under the jurisdiction of ASTM Committee A05 and its subcommittees as designated by a purchaser in a purchase order or contract. It may be applicable to other coatings, providing that the elemental nature of the coating and substrate are compatible with the technical aspects of XRF such as the absorption coefficient of the system, primary radiation, fluorescent radiation, type of detection. 5.1.1 This test method determines the coating thickness by repeatedly detecting fluorescent radiation from multiple, defined single spot data points, from which a weight [mass] can be determined, and may be used by other ASTM Committees and other standards writing bodies for the purpose of conformance testing. 5.1.2 The material condition at the time of testing, sampling frequency, specimen location and orientation, reporting requirements, and other test parameters are contained in the pertinent material specification or in a general requirement specification for the particular product form. 5.1.3 A coating of zinc on steel sheet provides protection against corrosion. As the protection is provided by sacrificial loss of zinc, the degree of protection is proportional to the weight [mass] of zinc coating. Specifications for zinc coated steel sheet frequently provide for different designations of coating so that the purchaser can select the coating weight [mass] most suitable for the intended application. 5.2 A reference is provided to the pertinent material specification for the procedures to be used to characterize the coating weight [mass] on production line coils of coated sheet.