| 摘要 |
<p>The invention relates to compositions and methods that are useful in etching a metal surface. In particular, the invention relates to novel acid compositions and methods of using such compositions in etching an aluminum surface prior to anodizing to dissolve impurities, imperfections, scale, and oxide. The composition is effective in maintaining its etching capacity and in removing smut produced by the etching of an aluminum surface as well as in general cleaning.</p> |
