SURFACE TREATMENT OF ALUMINUM OR ALUMINUM ALLOYS

摘要

Surface treatment for Al alloy with an anodically oxidised surface film starts with electrolysing the alloy article in a first solution containing at least one salt selected from Ca, Mg, Ba, Sr, Zn, Pb, Ti and Al salts to cause the salts to penetrate the microporse of the film to form a product within them. The article is then dipped in a second solution containing one or more substances that react with the product to convert it into a white or greyish white compound or is electrolysed in it.