| 摘要 |
PURPOSE:To manufacture the titled alumite substrate free from black spots and having superior smoothness and heat resistance by anodizing Al in a sulfamic acid soln. having a specified concn. at a specified bath temp., a specified current density and a specified voltage. CONSTITUTION:An Al or Al alloy material is anodizing by electrolysis in a sulfamic acid soln. having >=1wt%, preferably 5-18wt% concn. at 10-80 deg.C, preferably 20-50 deg.C bath temp., 0.1-10A/dm<2>, preferably 0.5-5A/dm<2> current density and 10-100V, preferably 20-80V voltage. The electrolysis time is about 10- 15min. It is preferable that the Al or Al alloy material has low Fe and Si contents.
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