The Coating of Magnesium Alloys

Surface coatings are applied to magnesium alloys against the destructive attack of salt spray or marine exposure, industrial atmospheres, etc. Most of these alloys contain aluminium and minute amounts of impurities which reduce the corrosion resistance of magnesium, whereas manganese improves its corrosion resistance. This article describes the various methods of treatment and painting used to preserve magnesium alloys, extensively used nowadays in castings where lightness is essential.