1.1 本试验方法定义了评估涂层系统对ASTM材料环境氢脆敏感性影响的程序和试验 F3125 等级 A490 高强度结构螺栓。 1.2 本试验方法应证明涂层系统适用于任何尺寸的涂层 F3125 等级 A490 螺栓（即， 1. / 2. 至1- 1. / 2. 英寸。）与EHE相关的高强度结构螺栓。 1.3 本试验方法要评估的特征是，由于涂层牺牲电偶腐蚀对钢螺栓的腐蚀保护而产生的氢对EHE的敏感性。 测试应在ASTM涂层试样上进行 F3125 等级 A490 按照最大敏感抗拉强度值制造的螺栓（参见 表1 )螺栓（参见第节 5. 试样螺栓要求）。当通过本试验方法测试EHE时，内部氢脆敏感性也将从本质上进行评估。无需单独进行IHE敏感性测试。 1.4 以英寸-磅为单位的数值应视为标准值。本标准不包括其他计量单位。 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====== 4.1 本试验方法描述了用于鉴定正在考虑用于ASTM的涂层系统的试验程序 F3125 等级 A490 由工程师允许的任何钢成分制成的高强度结构螺栓 F3125 等级规范 A490 螺栓。该测试方法测量了涂层试样螺栓对外加电势影响的敏感性（见 7.2.3.3 )通过测试盐溶液环境中的脆化阈值。

1.1 This test method defines the procedures and tests to evaluate the effect of a coating system on the susceptibility to environmental hydrogen embrittlement (EHE) of an ASTM F3125 Grade A490 high strength structural bolt. 1.2 This test method shall qualify a coating system for use with any size of F3125 Grade A490 bolts (that is, 1 / 2 to 1- 1 / 2 in.) high strength structural bolts, relative to EHE. 1.3 The characteristic to be evaluated by this test method is the susceptibility to EHE caused by hydrogen generated from corrosion protection of the steel bolt by sacrificial galvanic corrosion of the coating. Testing shall be performed on coated, specimen ASTM F3125 Grade A490 bolts manufactured to the maximum susceptible tensile strength values (see Table 1 ) of the bolt (see Section 5 Specimen Bolt Requirements). The internal hydrogen embrittlement (IHE) susceptibility will also be inherently evaluated when the EHE is tested through this test method. There is no need for a separate IHE susceptibility test. 1.4 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard. 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 ====== 4.1 This test method describes the testing procedure that shall be used to qualify a coating system that is under consideration for use on ASTM F3125 Grade A490 high strength structural bolts made of any steel composition permitted by the F3125 specification for Grade A490 bolts. The test method measures the susceptibility of coated specimen bolts to the influence of an externally applied potential (see 7.2.3.3 ) by testing for the threshold of embrittlement in a salt solution environment.