JPS55100998A - Continuous electrodeposition coating on anodic oxidation-treated aluminium - Google Patents

Abstract

PURPOSE: To obtain a desired film effectively by making electrification for a fixed hour by setting up voltage and current in advance according to the surface to be coated of an anodic oxidation-treated aluminium materials having various surface areas and shapes by using a specific water-soluble resin bath.

CONSTITUTION: Under the water-soluble resin bath conditions of pH 2W7 or 7W10, a resin concentration of 5W15%, a bath temperature of 20W25°C, and an electrode surface area ratio (object to be coated: counter electrode) of 2:1W1:1, an electrodeposition coating using the following electric circuit is performed on the anodic oxidation-treated aluminium materials (e.g., as building materials, etc.) having various surface areas and shapes, in which the relations between the surface area to be coated of the anodic oxidation-treated aluminium material, electrodeposition voltage or electrodeposition current, and the time of electrification are set up experimentally in advance to enable voltage or current to be set up according to the surface areas to be coated. In this method, the set voltage or current is built in the usual electric circuit and electrodeposition coating is performed.

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