1.1 本规程描述了用于干膜厚度测量的磁性和涡流计的使用。本规程旨在补充制造商关于仪表手动操作的说明，而不是取代这些说明。它包括关键术语的定义、参考文件、实践的意义和使用、涂层测厚仪的优点和局限性，以及试样的描述。它描述了验证量规精度和调整设备的方法和建议频率，并列出了报告建议。 1.2 这些程序不适用于在测量量规/探头负载下容易变形的涂层，因为量规探头必须直接放置在涂层表面上以获得读数。软涂层或粘性涂层的测量规定见 5.7 . 1.3 可以使用各种量规测量涂层厚度。这些测量仪分为“磁性拉脱”和“电子式”他们使用传感探头或磁铁测量基底金属和探头之间的间隙（距离）。该测量距离通过量规显示为涂层厚度。 1.4 涂层厚度在整个表面上变化很大。因此，获得单点测量可能无法准确表示实际涂层系统厚度。SSPC-PA 2规定了基于涂层区域大小的涂层厚度测量频率。SSPC-PA 2附录中还提供了涂层钢梁（主梁）和涂层试板的测量频率。管理规范负责为用户提供每层以及整个涂层系统的最小和最大涂层厚度。 1. 5. 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考，不被视为标准值。 1.6 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。 1.7 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 本规程描述了确保准确测量涂层厚度所需的三个操作步骤:校准、验证和调整涂层测厚仪，以及在黑色金属和有色金属基材上获得涂层厚度测量的正确方法。 4.2 商业和工业涂料项目的许多规范规定了涂层系统中每层的最小和最大干膜厚度。此外，大多数高性能涂料制造商将在一定程度上根据每层和总涂层系统的适当厚度对涂层系统进行保修。 即使未提供项目规范，产品数据表上公布的涂层制造商建议也可以成为管理文件。设备制造商生产无损涂层测厚仪，用于测量涂层干燥后的累积或单个厚度。制造商通常以操作说明的形式提供这些仪表的调整和使用信息。该设备的用户必须了解这些设备的正确操作，包括在使用之前、期间和之后验证设备准确性的方法以及测量程序。

1.1 This practice describes the use of magnetic and eddy current gages for dry film thickness measurement. This practice is intended to supplement the manufacturers’ instructions for the manual operation of the gages and is not intended to replace them. It includes definitions of key terms, reference documents, the significance and use of the practice, the advantages and limitations of coating thickness gages, and a description of test specimens. It describes the methods and recommended frequency for verifying the accuracy of gages and for adjusting the equipment and lists the reporting recommendations. 1.2 These procedures are not applicable to coatings that will be readily deformed under the load of the measuring gages/probes, as the gage probe must be placed directly on the coating surface to obtain a reading. Provisions for measuring on soft or tacky coatings are described in 5.7 . 1.3 Coating thickness can be measured using a variety of gages. These gages are categorized as “magnetic pull-off” and “electronic.” They use a sensing probe or magnet to measure the gap (distance) between the base metal and the probe. This measured distance is displayed as coating thickness by the gages. 1.4 Coating thickness can vary widely across a surface. As a result, obtaining single-point measurements may not accurately represent the actual coating system thickness. SSPC-PA 2 prescribes a frequency of coating thickness measurement based on the size of the area coated. A frequency of measurement for coated steel beams (girders) and coated test panels is also provided in the appendices to SSPC-PA 2. The governing specification is responsible for providing the user with the minimum and the maximum coating thickness for each layer, and for the total coating system. 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.6 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. 1.7 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 practice describes three operational steps necessary to ensure accurate coating thickness measurement: calibration, verification and adjustment of coating thickness measuring gages, as well as proper methods for obtaining coating thickness measurements on both ferrous and non-ferrous metal substrates. 4.2 Many specifications for commercial and industrial coatings projects stipulate a minimum and a maximum dry film thickness for each layer in a coating system. Additionally, most manufacturers of high performance coatings will warranty coating systems based upon, in part, achieving the proper thickness of each layer and the total coating system. Even if a project specification is not provided, the coating manufacturer’s recommendations published on product data sheets can become the governing document(s). Equipment manufacturers produce nondestructive coating thickness testing gages that are used to measure the cumulative or individual thickness of the coating layers, after they are dry. The manufacturers provide information for the adjustment and use of these gages, normally in the form of operating instructions. The user of this equipment must be knowledgeable in the proper operation of these devices, including methods for verifying the accuracy of the equipment prior to, during and after use as well as measurement procedures.