1.1 本试验方法包括使用磁性仪器无损测量黑色金属或其他磁性基底金属上非磁性涂层的厚度。本手册旨在补充制造商关于仪器操作的说明，而不是取代这些说明。 注1: 含8%以上的自催化沉积镍磷合金 % 只要在任何热处理之前进行测量，磷就足以通过本试验方法进行测量。 1.2 这些仪器测量磁铁和基体金属之间的磁吸引力，受涂层存在的影响（归类为“磁拉脱”），或探头内磁通密度的变化（归类为“电子”）。这些仪器无法区分各个层的厚度。 他们只能测量探头下至基底金属的所有层的累积厚度。 1.3 根据本试验方法进行的测量将符合ISO国际标准的要求 2178 1.4 单位- 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。 1.6 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 涂层的厚度通常对其性能至关重要。对于钢上的大多数有色金属涂层，磁性方法用于无损测量涂层厚度是可靠的，适用于规范验收测试和SPC/SQC应用。 5.2 本试验方法不应用于确定钢上电沉积镍涂层的厚度。试验方法 B530 适用于该测定。

1.1 This test method covers the use of magnetic instruments for the nondestructive measurement of the thickness of nonmagnetic coatings over ferrous or other magnetic base metals. It is intended to supplement manufacturers’ instructions for the operation of the instruments and is not intended to replace them. Note 1: Autocatalytically deposited nickel-phosphorus alloys containing more than 8 % phosphorus are sufficiently nonmagnetic to be measured by this test method, as long as the measurement is made prior to any heat treatment. 1.2 These instruments measure either the magnetic attraction between a magnet and the basis metal, as influenced by the presence of the coating (categorized as “magnetic pull-off”), or the change in magnetic-flux density within the probe (categorized as “electronic”). These instruments cannot distinguish the thickness of individual layers. They can only measure the cumulative thickness of all layers beneath the probe down to the base metal. 1.3 Measurements made in accordance with this test method will be in compliance with the requirements of ISO International Standard 2178. 1.4 Units— The values stated in SI units are to be regarded as the 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. 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 ====== 5.1 The thickness of a coating is often critical to its performance. For most nonferrous coatings on steel, the magnetic method is reliable for measuring coating thickness nondestructively and is suitable for specification acceptance testing and SPC/SQC applications. 5.2 This test method should not be used to determine the thickness of electrodeposited nickel coatings on steel. Test Method B530 is suitable for that determination.