ALUMINUM ALLOY FOR MICROPOROUS HOLLOW MATERIAL WHICH HAS EXCELLENT EXTRUDABILITY AND GRAIN BOUNDARY CORROSION RESISTANCE, AND METHOD FOR PRODUCING SAME
An aluminum alloy for microporous hollow shape material use constituted by an aluminum alloy which has excellent corrosion resistance and extrudability which keeps down the content of Cu which poses a problem in intergranular corrosion resistance, which maintains the natural potential noble, which adds transition metals which do not obstruct the extrudability is provided, that is, an aluminum alloy which has a chemical composition which contains, by mass%, Fe: 0.05 to 0.20%, Si: 0.10% or less, Cu: 0.15 to 0.32%, Mn: 0.08 to 0.15%, Zr: 0.05% or less, Ti: 0.06 to 0.15%, Cr: 0.03% or less, and balance: Al and unavoidable impurities and has an amount of gas in the alloy billet of 0.25 cc/100 g or less, and a method of production of an aluminum alloy which produces a DC cast billet having the above chemical composition so as to reduce the gas content and render it 0.25 cc/100 g or less by the casting conditions and melt treatment, then subjects it to a homogenization treatment comprising: heating it at a rate of 8
