ALUMINUM ALLOY SHEET HAVING BLUISH GRAY COLOR TONE AFTER ANODIC OXIDATION TREATMENT AND ITS PRODUCTION

摘要

PURPOSE: To produce a rolled sheet having a bluish dark gray color tone reduced in a tinge of yellow after anodic oxidation treatment. ;CONSTITUTION: This sheet is a rolled Al alloy sheet which consists of 1.2-5.5% Mg, 0.3-0.8% Mn, 0.0040-0.05% Ga, ≤0.5% Fe, ≤0.2% Si, ≤0.2% Cr, 0.003-0.20% Ti (combining 1 to 100ppm B), and the balance Al with inevitable impurities and in which Al₆Mn or Al₆(MnFe) having 0.05-1.5μm size is dispersed at (5×10 to 1×10⁷)pieces/mm density. The alloy is cast, preheated at 400-600°C for 0.5-24hr, and further heated, prior to hot rolling, at 350-530°C for 0.5-24hr, by which an Al-Mn intermetallic compound is precipitated. Then, primary cold rolling, process annealing, and final cold rolling are performed.;COPYRIGHT: (C)1996,JPO