1.1 本试验方法包括使用磁性仪器无损测量磁性或非磁性基底上电沉积镍涂层的厚度。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。 1.2 这些仪器测量磁铁和涂层-基板组合之间的磁吸引力（归类为“磁拉脱”），或探针内磁通密度的变化（归类为“电子”）。 1.3 对于本试验方法，可遇到两种类型的涂层-基材组合:A型，磁性基材上的镍涂层，和B型，非磁性基材上的镍涂层。 1.4 使用磁吸引原理的仪器的有效测量范围对于A类涂层高达50μm（2密耳），对于B类涂层高达25μm（1密耳）。对于基于磁通密度变化原理的量规，有效范围要大得多，可以在两种类型的涂层上进行高达1 mm（40 mils）或更大的测量。 1.5 根据本试验方法进行的测量将符合ISO标准的要求 2361，1982年印刷。 1.6 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。 1.7 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。 1.8 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。这种磁性方法适用于无损测量某些镍涂层的厚度，并用于规范验收。 5.2 该方法要求涂层及其基材的磁性与用于仪器校准调整的参考标准的磁性相同。 5.3 该方法不应用于测定钢上磷含量超过8%的自催化沉积镍磷合金的厚度。对于试验方法而言，这些涂层具有足够的非磁性 B499页 适用于该测定，只要在任何热处理之前进行测量。

1.1 This test method covers the use of magnetic instruments for the nondestructive measurement of the thickness of an electrodeposited nickel coating on either a magnetic or nonmagnetic substrate. It is intended to supplement manufacturers’ instructions for the operation of the instruments and is not intended to replace them. 1.2 These instruments measure either the magnetic attraction between a magnet and the coating-substrate combination (categorized as “magnetic pull-off”), or the change in magnetic flux density within the probe (categorized as “electronic”). 1.3 For this test method, there are two types of coating-substrate combinations that can be encountered: Type A, nickel coatings on a magnetic substrate, and Type B, nickel coatings on a nonmagnetic substrate. 1.4 The effective measuring ranges of instruments using the principle of magnetic attraction are up to 50 μm (2 mils) for Type A coatings, and up to 25 μm (1 mil) for Type B coatings. For gages based on change in magnetic flux density principles, the effective ranges are much greater, and measurements up to 1 mm (40 mils) or more, can be made on both types of coatings. 1.5 Measurements made in accordance with this test method will be in compliance with the requirements of ISO Standard 2361 as printed in 1982. 1.6 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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 The thickness of a coating is often critical to its performance. This magnetic method is suitable for measuring nondestructively the thickness of some nickel coatings and for specification acceptance. 5.2 This method requires that the magnetic properties of the coating and its substrate be the same as those of the reference standards used for the calibration adjustment of the instrument. 5.3 This method should not be used to determine the thickness of autocatalytically deposited nickel-phosphorus alloys containing more than 8 % phosphorus on steel. Those coatings are sufficiently nonmagnetic for Test Method B499 to be suitable for that determination, as long as the measurement is made prior to any heat treatment.