ISO 27831-2:20 08规定了在制造、储存或使用的任何阶段清洁有色金属及其合金表面以去除任何不相关或不需要的沉积物或其他材料以及准备这些表面以进行进一步处理的过程。它不包括与初步清除运行服务期间积累的大量油、油脂或污垢、焊接准备或电触点清洁相关的清洁操作。 它涵盖了在施加以下表面涂层之前制备金属表面所需的工艺: 电沉积金属涂层； 自催化金属涂层（自催化型和置换型）； 转化涂料； 阳极氧化涂层； 热浸涂料；喷涂金属涂层； 由搪瓷釉生产的涂层； 通过铝和镉的物理气相沉积产生的涂层； 粉末涂料。 它描述了用于进行以下处理的方法: 脱脂； 除垢； 酸洗； 蚀刻； 除锈； 化学平滑； 化学抛光； 电增亮； 电解抛光； 氟化物阳极氧化（用于清洗镁合金）。 本发明涉及上述方法与以下金属: 铝和铝合金； 铜和铜合金； 镍合金； 钛和钛合金； 镁合金； 锌基合金； 锡和锡合金； 钨合金； 铅和铅合金； 镀锌、镉、铬和镀金物品。

ISO 27831-2:2008 specifies processes for the cleaning of the surfaces of non-ferrous metals and their alloys to remove any irrelevant or unwanted deposits or other material at any stage of manufacture, storage or service and for the preparation of these surfaces for further treatment. It does not cover cleaning operations associated with the preliminary removal of heavy deposits of oil, grease or dirt accumulated during operational service, preparations for welding or the cleaning of electrical contacts. It covers processes which are needed for the preparation of metal surfaces prior to the application of the following surface coatings:

• electrodeposited metal coatings;
• autocatalytic metal coatings (autocatalytic and displacement types);
• conversion coatings;
• anodic oxidation coatings;
• hot-dipped coatings;
• sprayed metal coatings;
• coatings produced by vitreous enamelling;
• coatings produced by physical vapour deposition of aluminium and cadmium;
• powder coatings.

It describes processes for carrying out the following treatments:

• degreasing;
• descaling;
• pickling;
• etching;
• de-rusting;
• chemical smoothing;
• chemical polishing;
• electrobrightening;
• electropolishing;
• fluoride anodizing (for cleaning magnesium alloys).

It relates the processes described above to the following metals:

• aluminium and aluminium alloys;
• copper and copper alloys;
• nickel alloys;
• titanium and titanium alloys;
• magnesium alloys;
• zinc-based alloys;
• tin and tin alloys;
• tungsten alloys;
• lead and lead alloys;
• zinc-, cadmium-, chromium- and gold-coated items.