| 摘要 |
A trivalent cerium ion-containing solution is provided comprising (A) trivalent cerium ions, and (B) a substance selected from (i) an organic acid or salt thereof having a reducing action in an acidic region, (ii) a non-organic acid substance having a reducing action in an acidic region, and (iii) a substance having a chelating action in an acidic region. Trivalent cerium ions remain stable without precipitation of cerium compounds when the solution is processed in a neutral to weakly acidic region. The solution is useful as a corrosion inhibitor.
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