Surface treatment method of conductive substrate

Abstract

The invention discloses a surface treatment method of a conductive substrate. The surface treatment method comprises the following steps: carrying out one or two of pretreatments such as wire drawing, sand blasting or polishing on the surface of the conductive substrate; then carrying out primary electrophoretic coating or spraying treatment to form a layer of first-time electrophoretic paint or spraying paint with the color different from the original color of the conductive substrate; then carrying out primary laser carving or diamond carving treatment so as to form a first pattern exposing the original color of the conductive substrate and a second pattern with thinned primary electrophoretic (or spraying) paint; and next, carrying out roughing treatment including chemical roughing (weak acid or weak alkaline or a skin film) and physical roughing (plasma bombardment or sand blasting), then carrying out secondary electrophoretic coating or spraying treatment to form electrophoretic (or spraying) paint with color and high transparency or electrophoretic (or spraying) paint with no color and extremely-high transparency.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a surface treatment method of a conductive substrate. Background technique [0002] The electrophoretic coating process has many advantages such as easy automatic control, non-toxic, environmental protection, full coating, uniformity, smoothness, and smoothness, and the hardness, adhesion, corrosion resistance, and impact resistance of the electrophoretic coating are significantly better than other coatings. Therefore, the electrophoretic coating process is widely used in the coating treatment of the workpiece surface. [0003] In the past, in the electrophoretic coating process, only the appearance of a single color effect can be produced, and it cannot be satisfied with the appearance effect of different colors on the surface of the product. Later, the industry has made research and improvement on this, such as the patent application number 201110406662.5 The coating...

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Problems solved by technology

[0003] In the past, in the electrophoretic coating process, only the appearance of a single color effect can be produced, and it cannot be satisfied with the appearance effect of different colors on the surface of the product. Later, the industry has made research and improvement on this, such as the patent application number 201110406662.5 The coating method disclosed in the literature is to form the first coating layer by performing the first color electrophoresis on the surface of the substrate, and the electrophoresis voltage is 150-340V for 2-3 minutes; then the first laser engraving is performed, The engraved part removes the first coating layer, and then carries out the second electrophoretic coating, and forms a second coating layer with a color different from the first coating layer at the first laser engraving treatment part. In this way, the surface of the substrate is obtained Different colors make the surface of the substrate present a colorful appearance; the metal substrates that can be treated by the above process include stainless steel, aluminum or aluminum alloy

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