Automobile body-coating method

Abstract

An automobile body-coating method which comprises optionally subjecting an aluminum material in the automobile body to a surface treatment, followed by subjecting to an oxidizing film treatment, essentially or optionally, respectively and successively forming a curable electrodeposition coating film, a water based chipping primer coating film, an intercoat coating film, and a curable topcoat coating film, or comprises applying a film racing material onto an aluminum material or coating film-coated aluminum material, and comprises forming respective multi-layer coating films onto the steel material in the automobile body respectively.

What is claimed is:  
     
         1 . An automobile body-coating method which comprises optionally subjecting an outer plate area and/or an inner plate area of an automobile body comprising an aluminum material, an aluminum material-coated steel material or an aluminum material and steel material-combined metal material to a surface treatment, successively followed by coating a heat-curable electrodeposition coating composition to form a curable electrodeposition coating film, (1) coating a heat-curable water based intercoat coating composition to form a water based intercoat coating film or coating a heat-curable intercoat powder coating composition to form an intercoat powder coating film, (2) coating a water based chipping primer to form a water based chipping primer coating film followed by coating a heat-curable water based intercoat coating composition to form a water based intercoat coating film or coating a heat-curable intercoat powder coating composition to form an intercoat powder coating film, or (3) coating a water based chipping primer to form a water based chipping primer coating film, and coating a topcoat coating composition to form a curable topcoat coating film, respective coating films being heat-cured independently from each other to cure all of the respective coating films, or at least one multi-layer coating film selected from the group consisting of successively formed at least two-layer coating films being heat-cured simultaneously and at least one remaining coating film being independently cured respectively.  
     
     
         2 . An automobile body-coating method for coating an outer plate area and/or an inner plate area of an automobile body comprising an oxidized aluminum material or an oxidized aluminum material and steel material-combined metal material, which method comprises (1) electrodeposition coating a heat-curable electrodeposition coating composition onto the surface of the oxidized aluminum material in the outer plate area and/or the inner plate area of the automobile body to form an electrodeposition coating film followed by heat curing, optionally the steel material being subjected to a surface treatment followed by being subjected to an electrodeposition coating, or (2) coating a heat-curable water based intercoat coating composition or a heat-curable intercoat powder coating composition onto the outer plate area and/or the inner plate area of the automobile body to form a water based intercoat coating film or an intercoat powder coating film respectively, followed by coating a curable topcoat coating composition to form a curable topcoat coating film, and heat curing both coating films independently from each other or simultaneously, optionally the steel material being subjected to an electrodeposition coating.  
     
     
         3 . An automobile body-coating method which comprises applying a film facing material onto the surface of an aluminum material or an aluminum material-coated steel