1.1本试验方法涵盖了通过电化学方法测量钢中扩散氢的程序。 1.2本试验方法仅限于碳钢或合金钢，不包括奥氏体不锈钢。 1.3本试验方法仅限于可连接电池的扁平试样（见4.6和4.8）。 1.4本试验方法描述了在移除钢板后对裸钢或电镀钢进行的试验（见4.4）。 1.5本试验方法仅限于在室温（20至25℃）下进行测量 ° C（68至77 ° F） 。 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和健康实践，并确定监管限制的适用性。 ====意义和用途====== 钢中氢的临界水平是氢，氢在高三轴应力点积聚到高浓度，导致钢脆化，从而导致灾难性损伤。 这种氢可以通过各种方式进入，例如在酸洗和电镀过程中。规范中给出了在加工过程中减少氢气的方法 B766 和实践 B183 和 B242 . 然而，仍然有必要了解这些方法的有效性。尽管测量氢的最终原因是将其与脆化联系起来，但这不在本试验方法的范围内。由于氢脆敏感性是合金类型、热处理、预期用途等的函数，因此用户必须根据方法确定氢的公差 F519页 . 尽管本试验方法中未确定实际氢浓度，但电流密度已被证明可用于指示相对氢浓度 (1-3) 因此氢脆的程度 (1,2) . 因此，可以相互比较测量值（见4.1和7.1）。 本试验方法适用于作为加工的质量控制工具（如监测电镀和烘烤）或测量腐蚀引起的氢吸收。 该试验方法是无损的；然而，如果有涂层，则必须通过已证明既不会损坏钢也不会引入氢气进行测量的方法将其去除。 本试验方法也适用于产生连续氢渗透的情况，如高压氢气瓶或腐蚀过程。然而，结果需要不同的处理和解释 (4) . 本试验方法也适用于小零件，如紧固件。然而，必须改变技术、程序和解释。 由于动力学不同，在奥氏体不锈钢和其他面心立方（FCC）合金上使用本试验方法需要不同的测量时间和结果解释。 只要垫圈定义了一个可重复的区域，该试验方法可用于稍微弯曲的表面。但是，必须更改面积计算。

1.1 This test method covers the procedure for measuring diffusible hydrogen in steels by an electrochemical method. 1.2 This test method is limited to carbon or alloy steels, excluding austenitic stainless steels. 1.3 This test method is limited to flat specimens to which the cell can be attached (see 4.6 and 4.8). 1.4 This test method describes testing on bare or plated steel after the plate has been removed (see 4.4). 1.5 This test method is limited to measurements at room temperature, 20 to 25 ° C (68 to 77 ° F). 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== The critical level of hydrogen in steels is that hydrogen which can build up to high concentrations at points of high triaxial stress causing embrittlement of the steel which can lead to catastrophic damage. This hydrogen can enter by various means, such as during pickling and electroplating. Means of reducing this hydrogen during processing are given in Specification B766 and Practices B183 and B242 . It is still necessary, however, to know how effective these methods are. Though the ultimate reason for measuring this hydrogen is to relate it to embrittlement, this is not within the scope of this test method. As susceptibility to hydrogen embrittlement is a function of alloy type, heat treatment, intended use,and so forth, the tolerance for hydrogen must be determined by the user according to Method F519 . Though the actual hydrogen concentration is not determined in this test method, the current densities have been shown to be useful as an indication of relative hydrogen concentrations (1-3) , and therefore the degree of hydrogen embrittlement (1,2) . Thus, measurements can be compared to one another (see 4.1 and 7.1). This test method is applicable as a quality control tool for processing (such as to monitor plating and baking) or to measure hydrogen uptake caused by corrosion. This test method is nondestructive; however, if there is a coating, it must be removed by a method which has been demonstrated to neither damage the steel nor introduce hydrogen to make the measurement. This test method is also applicable to situations producing continuous hydrogen permeation, such as high pressure hydrogen cylinders or corrosion processes. The results, however, would require a different treatment and interpretation (4) . This test method is also applicable to small parts, such as fasteners. The technique, procedure, and interpretation would, however, have to be altered. Use of this test method on austenitic stainless steels and other face centered cubic (FCC) alloys would require different measurement times and interpretation of results because of differing kinetics. This test method can be used on slightly curved surfaces as long as the gasket defines a reproducible area. The area calculation must, however, be changed.