CORROSION PROPERTIES OF MATERIALS - CONTINUED

摘要

Stainless steels are iron alloys which depend on a very thin, transparent, passive surface film of chromium oxide to provide resistance to corrosion. This film will form, stay intact and repair in air at room temperature as long as two conditions are met:· the matrix material must have at least 11 per cent chromium dissolved in it and· there must be a ready supply of oxygen.If these conditions are met, stainless steels will exhibit excellent resistance to many corrosive environments. There are, however, a number of problems which can arise that can cause the protective surface film to break down resulting in different types of corrosion.