1.1 本试验方法包括使用螺旋收缩仪测量螺旋阴极电镀溶液产生的金属涂层的内应力。该试验方法可用于电解和自动催化沉积物。 1.2 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 1.3 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。 1.4 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 正确使用螺旋收缩仪将得出可重复的结果（见 9.5 )在广泛的应力值范围内。此方法的内应力极限可由电镀或电铸零件的买方和制造商指定。 5.2 具有较大拉伸应力的电镀将降低高强度钢制品的疲劳强度。可以指定最大应力限制以将其最小化。 受应力影响的其他性能包括耐腐蚀性、尺寸稳定性、开裂和剥落。 5.3 在电铸溶液的控制中，应力的影响得到了更广泛的认可，通常需要控制应力才能获得可用的电铸。可以为生产控制确定和规定内应力极限。 5.4 螺旋收缩仪获得的内应力值不一定反映在相同溶液中电镀零件上的内应力值。内应力随许多因素而变化，如涂层厚度、基板制备、电流密度和温度以及溶液组成。当测试条件与用于涂覆零件的条件匹配时，可以实现更紧密的相关性。

1.1 This test method covers the use of the spiral contractometer for measuring the internal stress of metallic coatings as produced from plating solutions on a helical cathode. The test method can be used with electrolytic and autocatalytic deposits. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.3 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. 1.4 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 spiral contractometer, properly used, will give reproducible results (see 9.5 ) over a wide range of stress values. Internal stress limits with this method can be specified for use by both the purchaser and the producer of plated or electroformed parts. 5.2 Plating with large tensile stresses will reduce the fatigue strength of a product made from high-strength steel. Maximum stress limits can be specified to minimize this. Other properties affected by stress include corrosion resistance, dimensional stability, cracking, and peeling. 5.3 In control of electroforming solutions, the effects of stress are more widely recognized, and the control of stress is usually necessary to obtain a usable electroform. Internal stress limits can be determined and specified for production control. 5.4 Internal stress values obtained by the spiral contractometer do not necessarily reflect the internal stress values found on a part plated in the same solution. Internal stress varies with many factors, such as coating thickness, preparation of substrate, current density, and temperature, as well as the solution composition. Closer correlation is achieved when the test conditions match those used to coat the part.