| 摘要 |
<p>Triazine ring containing inhibitors, which have been widely taught in the prior art as excellent inhibitors for hydrochloric acid based pickling compositions, have been found not to be effective for prolonged use when the pickling compositions can dissolve significant amounts of zinc ions, because the inhibitor precipitates as a solid in the presence of both zinc and chloride ions. Other nitrogen containing pickling inhibitors are free from this difficulty and function effectively even in the presence of zinc. Combinations of alkyl aryl polyalkyleneamine and hexamethylene tetramine inhibitors are particularly effective.</p> |
