C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/18 (2006.01)
Patent
CA 2174337
The formation on the surface of Mg-containing metal of a highly corrosion-resistant, highly rust-inhibiting, and strongly paint- adherent conversion coating, using a chromic acid-free treatment bath, is achieved by treatment with a pH 2.0 - 5.0 aqueous bath that contains phosphoric acid, manganese ion, and amine, thereby forming a conversion coating that contains P-Mn and Mn-N and/or other nitrogen compounds.
On réalise un revêtement de conversion extrêmement résistant à la corrosion, à pouvoir anti-rouille-élevé, et favorisant l'adhérence de la peinture, sur la surface d'un métal contenant du magnésium, au moyen d'un bain de traitement exempt d'acide chromique, par l'intermédiaire d'un traitement avec un bain aqueux, dont le pH est compris entre 2 et 5 et contenant de l'acide phosphorique, des ions manganèse et une amine. On obtient ainsi un revêtement de conversion contenant P-Mn et Mn-N et/ou d'autres composés azotés.
Ishizaki Sadao
Nishida Masahiko
Sato Yokichi
Fetherstonhaugh & Co.
Henkel Corporation
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