Abstract
Cationic electrodeposition coatings were cured with a penetrative crosslinker at ambient temperature. This method is based on a novel technology in which coating films are dipped in aqueous crosslinker solution which moves into the film, accompanied by crosslinking. Pencil hardness, impact strength, solvent resistance and water resistance were improved with dipping time, that is, with the penetration of crosslinking. On the contrary, corrosion resistance was controlled by two opposing factors arising from the crosslinking—strengthening of the coating barrier property and weakening of the adhesion force. Excellent protective coatings were obtained by selection of resins and control of crosslinking.
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