| 摘要 |
PROBLEM TO BE SOLVED: To inexpensively produce an Al product having antibacterial properties by subjecting Al or an Al alloy to a.c. electrolysis in an electrolytic bath contg. a water soluble silver compound. SOLUTION: An extruded shape material of an Al alloy, e.g. subjected to pretreatment of degreasing (immersion in an aq. soln. of 10wt.% nitric acid), etching immersion in an aq. soln. of 5wt.% caustic soda heated at 60 deg.C for 7min) and desmutting (immersion in an aq. soln. of 10wt.% nitric acid) is subjected to electrolytic treatment for 15min by a dinusoidal current under 18V using an electrolytic bath obtd. by adding 0.2g/L silver nitrate to an aq. soln. having 130g/L nitric acid concn. and held to 20 deg.C soln. temp. Then, oxidized coating of about 9μ(is formed on the surface of the extruded shape material. Next, it is subjected to boiling water sealing treatment for 20min in a sealing soln. contg. a surfactant. In this way, when the potential of the material to be treated is made negative, silver is precipitated into anodically oxidized coating layer, and, by the antibacterial action characteristic of silver, antibacterial properties are imparted to the Al or Al alloy.
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