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Abstract
The oxidation layer formed on the surface of aluminum brass corroded in sea water at 40° C for 15 days was analysed by using different techniques (chemical analysis after selective dissolution, X-ray diffreactometry and Auger spectroscopy) and was found to be formed by Cu oxychlorides, basic Zn sulfates, Al and Mg Car bonates, Al oxides.
Chemical and diffractometric analyses yield an average value of the composition of the corrosion layer, whose thickness should be greater than 60-80° Å for chemical and than 100 Å for diffraacto metric analysis.
Auger speactroscopy permits the analysis of thin films and of small surface areas, and gives results that agree with those of the other two techniques when the corrosion layer is homogeneous.
