意义和目的
5.1 涂层的厚度通常对其性能非常重要. For most nonferrous metal coating on the steel, magnetic method for nondestructive measurement of coating thickness is reliable, suitable for specification acceptance testing and SPC/SQC application.

5.2 this test method is not applied to determine the thickness of electrodeposited nickel coating on steel. 测试方法 B530 适用于本测定.

ASTM B499-2021 “通过磁化测量磁性贱金属材料上未磁化涂层厚度的试验方法”

The scope of
1.1 the test methods include the use of magnetic equipment for black metal or other non-magnetic coating thickness on the magnetic base metal nondestructive measurement. It is intended to complement the manufacturer’s instructions for the operation of the instruments and is not intended to replace them.

笔记 1: contains more than 8% phosphorus autocatalytic deposition ni-p alloy with sufficient non-magnetic, as long as the measured before any heat treatment, can use this kind of test methods for measuring.

1.2 these instruments measure the magnets and magnetic attraction between parent metal, affected by the presence of coating (分类为 “磁力拉脱”), or the change of the magnetic flux density inside probe (分类为 “电子的”). 这些仪器无法区分各个层的厚度. They can only measure the probe the cumulative thickness, and all layers below until the base metal.

ASTM B499-2021 “通过磁化测量磁性贱金属材料上未磁化涂层厚度的试验方法”

1.3 Measurements made according to this test method will comply with the requirements of ISO International Standard 2178.

1.4 单位 – SI单位应被视为标准. 括号内的数值仅供参考.

1.5 本标准并非旨在解决所有安全问题, 如果有的话, 与其使用相关. 本标准的使用者有责任建立适当的安全机制, 健康和环境实践，并在使用前确定监管限制的适用性.

1.6 这个国际标准就是技术性贸易壁垒, 根据世界贸易组织委员会发布的 “关于制定国际标准, 决定原则的指导方针和建议” 建立国际公认的标准化原则.