Anodic electrophoretic coating method

C - Chemistry – Metallurgy – 25 – D

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C25D 13/24 (2006.01) C25D 13/04 (2006.01) C25D 13/10 (2006.01)

Patent

CA 2318202

A method for anodic electro-dip lacquer coating, wherein coating medium which is consumed in an anodic electro-dip bath is compensated for by an under- neutralised anodic replenishment material, wherein the replenishment material comprises A) a pigment-free aqueous binder vehicle component with a solids content of 40 to 70 % by weight, an MEQ value of 15 to 40 and a content of organic solvent of <= 0.5 % by weight, and B) a pigment-containing aqueous paste resin component with a solids content of 60 to 75 % by weight, an MEQ value of 5 to 15 and a content of organic solvent of <= 1.0 % by weight, wherein A) and B) are present in a ratio by weight of 1:1 to 4 :1 and the mixture of A) and B) has a solids content of 45 to 73 % by weight, a solvent content of <= 0.75 % by weight and an MEQ value which is 50 to 70 % lower than the MEQ value of the electro-dip bath.

L'invention concerne un procédé de trempage électrophorétique anodique, selon lequel un matériau de revêtement consommé dans un bain électrophorétique anodique est compensé par un matériau de remplissage anodique sous-neutralisé. Ce matériau de remplissage contient A) un liant aqueux sans pigment présentant une teneur en extrait sec comprise entre 40 et 70 % en poids, une valeur mEq comprise entre 15 et 40 et une teneur en solvant organique </=0,5 % en poids, et B) une résine pâteuse aqueuse renfermant un pigment, présentant une teneur en extrait sec comprise entre 60 et 75 % en poids, une valeur mEq comprise entre 5 et 15, et une teneur en solvant organique </=1,0 % en poids. Le rapport en poids entre A) et B) est compris entre 1:1 et 4:1, le mélange de A) et B) présente une teneur en extrait sec comprise entre 45 et 73 % en poids, une teneur en solvant </=0,75 % en poids, et une valeur mEq inférieure de 50 à 70 % à celle du bain électrophorétique.

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