C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/17 (2006.01)
Patent
CA 2236173
A combination of difunctional organic acid, preferably a hydroxy acid such as citric acid, or salt thereof with acrylic acid/acrylate polymers in zinc phosphate conversion coating forming liquid compositions, preferably also containing hydroxylamine, results in crystal size refinement in the coating formed and/or faster formation of a sufficiently thick conversion coating to protect against subsequent rusting of a ferrous substrate.
L'invention concerne une combinaison d'acide organique bifonctionnelle (de préférence un acide hydroxy comme l'acide citrique ou un sel de cet acide) et de polymères à base d'acide acrylique/acrylate intégrée à des compositions liquides pour revêtement de conversion en phosphate de zinc (contenant de préférence également de l'hydroxylamine). Ce type de composition donne un revêtement à base de cristaux plus fins et/ou à formation plus rapide d'une couche de conversion suffisamment épaisse, en vue de protéger un substrat ferreux contre la rouille à laquelle il peut être exposé ultérieurement.
Cormier Gerald J.
Kuhm Peter
Petschel Michael
Sienkowski Michael L.
Henkel Corporation
Swabey Ogilvy Renault
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