The Analysis and Composition Of Aluminum Corrosion Products^★

The various techniques applicable to investigation of aluminum corrosion products are discussed. Analytical procedures suitable for the determination of the various constituents in aluminum products are outlined. Methods reported include X-ray diffraction, X-ray fluorescense, differential thermal analysis,, electrographic methods, spectrographic analysis, microscopic examination, and qualitative and quantitative tests. Analytical data are presented for a number of corrosion products investigated. A study is made of corrosion products found in the following environments: fresh water, sea water and the atmosphere. Other topics discussed include presence of copper and mercury in aluminum corrosion products, pH of surface and water extract, and effect of chlorides. Data reported include effect of sea velocity on composition of corrosion products formed in 99.5 percent aluminum tubing, constituent/alumina ratios for sea water pipe products and composition of corrosion products of different alloys exposed in various industrial atmospheres. 3.4.3