Preparation of nonferrous metals for painting

摘要

Metals to be painted should be cleaned to remove oily soils and loose materials. It may not be necessary to remove the natural oxides if they are solid, such as the blue scale on heated steel; however, for many active metals it may be advantageous to remove the natural oxides and replace them with artificially formed oxides by "anodizing." For the preparation of aluminum, see both "Paint Pretreatments for Aluminum" and "Anodizing as a Pretreatment for Aluminum," in this section of the Guidebook. The preparation of cadmium, chromium, cobalt, copper, lead, magnesium, molybdenum, nickel, silver , stainless steels, titanium, zinc, and alloys of zinc-nickel and tin-zinc are covered here. Each metal requires its own processing, but a few general steps are the same for all Metals.