PROCESS FOR FORMING A SURFACE LAYER ON ALUMINUM AND ALUMINUM ALLOY ARTICLES AND SO FORMED ARTICLES

摘要

A process for forming a surface layer on aluminum and aluminum alloy articles, characterized by forming on the surface of the article a coating comprising maganese and reaction products of manganese with oxygen and nitrogen or with oxygen, nitrogen and sulphur. An article comprising at least a surface part of aluminum or aluminum alloy, characterized in that the aluminum or aluminum alloy surface is provided with a surface coating comprising manganese and reaction products of maganese with oxygen and nitrogen, or with oxygen, nitrogen and sulphur, preferably as particles dispersed in a manganese surface layer matrix.