C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/78 (2006.01)
Patent
CA 2283387
A pretreatment before phosphating conversion coating is effected by contacting a metal substrate to be coated with a pretreatment composition that has a pH from 4 to 13 and contains dispersed fine particle size alkali metal or ammonium salts and divalent or trivalent metal phosphates. The conditioning achieved is as good as with conventional Jernstedt salts and the pretreatment compositions according to the invention are more storage stable.
La présente invention concerne un prétraitement préalable à la phosphatation que l'on réalise en mettant un substrat de métal à enduire en contact avec une composition de prétraitement dont le pH est compris entre 4 et 13, et qui contient en dispersion de fines particules de sels de métaux alcalins ou d'ammonium et des phosphates de métaux divalents ou trivalents. Le conditionnement réalisé est aussi bon qu'avec les sels conventionnels de Jernstedt, les compositions de prétraitement de l'invention étant plus stable au stockage.
Nagashima Yasuhiko
Nakayama Takaomi
Shimoda Kensuke
Henkel Corporation
Henkel Kommanditgesellschaft Auf Aktien
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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