Inhibited pickling acids containing chloride and zinc ions

C - Chemistry – Metallurgy – 23 – G

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C23G 1/06 (2006.01)

Patent

CA 2226887

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.

Des inhibiteurs contenant un noyau triazine, lesquels ont été largement vantés dans les techniques actuelles comme étant d'excellents inhibiteurs de compositions décapantes à base d'acide chlorhydrique, ne se sont pas révélés efficaces lors d'une utilisation prolongée quand les composition décapantes peuvent dissoudre des quantités importantes d'ions zinc, car l'inhibiteur précipite comme un solide en présence à la fois d'ions zinc et d'ions chlorure. D'autres inhibiteurs de décapants contenant de l'azote ne présentent pas cet inconvénient et fonctionnent de manière efficace, même en présence de zinc. Des combinaisons d'inhibiteurs de polyalkylèneamine d'alkyle aryle et de tétramine d'hexaméthylène sont particulièrement efficaces.

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