| 摘要 |
<p>A method for the treatment of aluminum or aluminum alloy material comprising treating the material in a series of alkaline baths and a series of acid baths connected in series in regular order, said alkaline baths having an alkali concentration gradient gradually decreasing from higher to lower values, the alkali concentration in the last stage bath being controlled to a defined level, and said acid baths having an acid concentration gradient of gradually decreasing from higher to lower values and the last stage bath being of pure water. The aluminum or aluminum alloy surface can be processed uniformly and economically by the instant process.</p> |
