MANUFACTURE OF ALUMINUM ALLOY SHEET CAPABLE OF OBTAINING ANODICALLY OXIDIZED FILM HAVING UNIFORM COLOR TONE AND EXCELLENT IN CORROSION RESISTANCE

摘要

PURPOSE: To attain the stabilization of quality by subjecting an Al allay contg. specified amounts of Si, Fe and Mg to heat treatment and hot rolling under specified conditions, executing cold rolling and intermediate heat treatment and subjecting it to cold rolling at a specified rate of decrease. ;CONSTITUTION: An Al alloy is constituted of, by weight, 0.05 to 0.5% Si, 0.15 to 0.9%. Fe, 0.30 to 1.0% Se+Fe as well as Si≤Fe, 0.01 to 0.O5% Ti and (Si%)×(0.3 to 1.0)% Mg, and the balance ≥99.00% Al with ≤0.05% inevitable impurities. This Al alloy is made into an ingot, which is thereafter subjected to heat treatment at 450 to 600°C for 1 to 20hr, its hot rolling is started at 450 to 550°C and the rolling is finished at 200 to 300°C material temp. It is subjected to cold rolling and intermediate heat treatment at ≤400°C for ≥30min, and final cold rolling is executed at ≥30% rate of decrease. In this way, the corrosion resistance of the objective alloy can be improved, and the service life of the product can be prolonged.;COPYRIGHT: (C)1993,JPO&Japio