1.1 这些实践包括两类处理，用于涂装镁合金表面的制备，如下所示: I级-- 化学处理。 II级-- 阳极处理。 一般来说，后一种治疗方法是这两类中保护性更强的。机械（研磨）处理、溶剂清洗、碱性溶液处理和酸洗不产生保护性转化涂层，仅适用于暴露在轻度腐蚀性（室内）环境中的金属。 当需要高度的防腐和油漆附着力时，如在许多室外环境中，需要通过上述转化涂层类别之一进行表面处理。不推荐使用基于六价铬的方法，因为六价铬是一种已知的致癌物。 注1: 涂层测试-- 涂层的质量控制测试通常是可取的，这些测试通常包括暴露在盐雾、湿度或自然环境中，无论是否有油漆，并采用适当的程序来评估固定时间间隔后的击穿程度。 建议涂层的质量控制试验应尽可能使用高纯度材料（例如AZ31A合金）进行， 2. 其固有腐蚀速率在不同批次之间相对一致，并且在涂覆涂层之前应采取预防措施去除表面污染。应通过酸洗去除此类污染物，酸洗深度至少为每侧0.001英寸（25μm）。 1.2 本标准可能涉及危险材料、操作和设备。 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。（请参见 附注11 ） 1.3 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 These practices cover two classes of treatment for preparation of magnesium alloy surfaces for painting, as follows: Class I— Chemical Treatments. Class II— Anodic Treatments. In general, the latter treatments are the more protective of the two classes. Mechanical (abrasive) treatments, solvent cleaning, alkaline solution treatments, and acid pickles not resulting in protective conversion coatings are suitable preliminary treatments only for metal to be exposed under mildly corrosive (indoor) exposures. When a high degree of corrosion protection and paint adhesion are desired, as in many outdoor environments, surface preparation by one of the above conversion-coat classes is necessary. The hexavalent chromium based methods given are not recommended as hexavalent chromium is a known carcinogen. Note 1: Testing of Coatings— Quality control tests of coatings are frequently desirable, and these generally consist of exposures, with or without paint, to salt spray, humidity, or natural environments, with suitable procedures for assessing the degree of breakdown suffered after fixed time intervals. It is recommended that quality control tests of coatings shall be made as far as possible with high-purity material (for example AZ31A alloy), 2 the inherent corrosion rate of which is relatively consistent from batch to batch and that precautions shall be taken to remove surface contamination before coatings are applied. Such contamination shall be removed by acid pickling to a depth of at least 0.001 in. (25 μm) per side. 1.2 This standard may involve hazardous materials, operations, and equipment. 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. (See Note 11 .) 1.3 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.