PROCESS FOR MANUFACTURING A DECOLLETE AND ANODIZED 6XXX ALLOY MECHANICAL PIECE HAVING LOW ROUGHNESS AFTER ANODIZATION

摘要

The invention relates to a method for manufacturing a mechanical part in which successively is cast a billet of aluminum alloy composition, in% by weight, Si 0.4 - 3.0; Mg 0.6 - 2.0; Cu 0.20 - 1.0; Fe 0.15 - 1.8; Mn 0.5; Ni 1; Ti 0.15; Cr 0.35; Bi 0.8; Pb 0.4; Zr 0.04 other elements 0.05 each and 0.15 in total, remainder aluminum, homogenize said billet, spin said billet to obtain a spun product, quenched on spinning heat, optionally straighten and / or typically cold deformed by pulling and / or drawing, and / or said spun product is ripened, an income is obtained, optionally cold deformed typically by drawing said spun product, and the thus obtained spun product is produced to obtain mechanically décolletée, optionally the mechanical part thus obtained is shaped anodizing the mechanical part thus obtained, said anodization being carried out at a temperature between 15 and 40 ° C with a solution comprising 100 to 250 g / l of sulfuric acid and 10 to 30 g / l of oxalic acid and 5 to 30 g / l of at least one polyol. The mechanical parts cut and anodized obtained by the process according to the invention have in particular an advantageous roughness and are useful in particular as a brake piston or gearbox element.