Cationic electrodeposition coating composition

Details Cationic electrodeposition coating composition Cationic electrodeposition coating composition

C - Chemistry, Metallurgy

09

D

C09D 5/44 (2006.01) C25D 13/06 (2006.01) C25D 13/10 (2006.01) C09D 5/08 (2006.01)

Patent

CA 2319814

A cationic electrodeposition paint composition, characterized by comprising (A) a resin for cationic electrodeposition, (B) a compound containing a metal selected from among bismuth, lanthanum and molybdenum, and (C) a metal hydroxide represented by the following general formula: M(1-x)Al x(OH)(2+x).cndot.mH2O (wherein M is Mg or Zn; and x and m are values satisfying the relationships: 0<=x<=1 and 0<=m < 2). The composition makes it possible to form coating films which exert an excellent rustproofing effect on untreated steel sheets and have excellent smoothness without using harmful substances such as lead or chromium compounds.

L'invention concerne une composition de peinture pour électrodéposition cationique renfermant: A) une résine pour électrodéposition cationique; B) un composé contenant un métal choisi parmi le bismuth, le lanthane, et le molybdène; et C) un hydroxyde métallique représenté par la formule générale suivante: M(1-x)Alx(OH)(2+x) •mH2O (dans laquelle M représente Mg ou Zn; et x et m sont des valeurs correspondant aux rapports: 0</=x</=1 et 0</=m<2). La composition de cette invention permet de former des films de revêtement qui exercent un excellent effet anticorrosion sur des tôles d'acier non traitées, et présentent un aspect extrêmement lisse sans pour autant utiliser de substances nocives, par exemple des composés de plomb ou de chrome.

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