1.1 这些方法提供了一种控制蚀刻剂有效性的方法，蚀刻剂通常用于制备铝合金表面以进行后续粘接。当蚀刻剂与铝反应时，六价铬转化为三价铬；二者的测量值和差值可用于确定所用重铬酸盐的量。 1.2 通过将重铬酸钠和硫酸恢复到原始配方水平，可以补充亚硫酸铬酸盐溶液。有效性的下限取决于溶液储存、使用的粘合剂、粘结能力的临界性质、加工的金属种类等。 并应予以确定。补充将限于化学成分可以恢复和维持到所需水平的次数，并应由用户决定。通过定期清除污泥，应尽量减少收集在储罐底部的污泥。对于某些应用，六价铬不应低于三价铬含量。 1.3 典型的亚硫酸盐水蚀刻溶液配方如下: 重铬酸钠（Na 2. Cr公司 2. O 7. ) 4.5盎司/加仑（33.7克/升） 硫酸（sp gr 1。 84) 45盎司/加仑（337.1克/升） 1.4 建议通过适当添加重铬酸钠或硫酸来维持水浓度。 重铬酸钠 3.0至6.0盎司/加仑（22.5至44.9克/升） 硫酸 40至50盎司/加仑（299.6至374.5克/升） 1.5 方法A用于测量亚硫酸铬酸盐溶液中的硫酸含量。方法B用于测量亚硫酸铬溶液中的六价和三价铬含量。方法C旨在作为测量亚硫酸铬溶液中六价和三价铬含量的替代方法。 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。

1.1 These methods offer a means for controlling the effectiveness of the etchant which is normally used for preparing the surface of aluminum alloys for subsequent adhesive bonding. As the etchant reacts with the aluminum, hexavalent chromium is converted to trivalent chromium; a measure of the two and the difference can be used to determine the amount of dichromate used. 1.2 The sulfochromate solution can be replenished by restoring the sodium dichromate and the sulfuric acid to the original formulation levels. The lower limit of usefulness will vary depending upon solution storage, adhesives used, critical nature of bond capability, variety of metals processed, etc. and should be determined. Replenishment will be limited to the number of times the chemical ingredients can be restored and maintained to the required levels and should be determined by the user. Sludge collecting in the bottom of a tank should be minimized by periodic removal of sludge. For some applications, the hexavalent chromium should not fall below the trivalent chromium content. 1.3 A typical aqueous sulfochromate acid etch solution formulation is as follows: Sodium dichromate (Na 2 Cr 2 O 7 ) 4.5 oz/gal (33.7 g/litre) Sulfuric acid (sp gr 1.84) 45 oz/gal (337.1 g/litre) 1.4 Maintenance of the aqueous concentrations is suggested as follows by appropriate additions of sodium dichromate or sulfuric acids. Sodium dichromate 3.0 to 6.0 oz/gal (22.5 to 44.9 g/litre) Sulfuric acid 40 to 50 oz/gal (299.6 to 374.5 g/litre) 1.5 Method A is intended for measuring the sulfuric acid content of a sulfochromate solution. Method B is intended for measuring the hexavalent and trivalent Chromium content of a sulfochromate solution. Method C is intended as an alternative method for measuring the hexavalent and trivalent Chromium content of a sulfochromate solution. 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.