Organic-inorganic composite coating on metal surface and preparation process thereof

Abstract

The invention discloses a preparation process of an organic-inorganic composite coating on a metal surface. The preparation process is characterized by comprising the following steps: (a) preparing sol of a carboxyl carbon nano tube coated by inorganic nano particles; (b) adding the sole into a solution of an organic polymer with a plurality of hydroxyl / amino groups; and (c) performing pulse electrodeposition on the organic-inorganic composite system at 30-55 DEG C and a 0.05-20Hz low voltage to ensure that the organic-inorganic composite system is formed on the metal surface. The invention also discloses the organic-inorganic composite coating prepared by the preparation process. Compared with the conventional dip coating process, the preparation process disclosed by the invention has lower requirements on the smoothness of the metal surface and can effectively realize controllable preparation; the prepared organic-inorganic composite coating is nontoxic and environment-friendly, the membranous layer is thicker, more compact and more uniform, and the organic-inorganic composite coating has a more lasting and stable protection effect on a metal matrix. Therefore, the corrosion-resistant composite coating prepared by the method has a very good application prospect.

Description

technical field [0001] The invention relates to a metal surface corrosion-resistant coating and a preparation process thereof, in particular to a metal surface organic-inorganic corrosion-resistant composite coating and a preparation process thereof. Background technique [0002] Metal corrosion is a natural phenomenon ubiquitous in nature. It is a phenomenon in which metal materials and the surrounding environment undergo chemical or electrochemical effects and are destroyed. The direct economic loss caused by metal corrosion accounts for about 3% of the gross national product every year. Therefore, metal corrosion and protection are related to the sustainable development of the entire national economy. Surface treatment of metal is a measure that is widely used and has remarkable effects. The traditional metal surface treatment technology is mainly chromate treatment and phosphate treatment technology, but the traditional metal surface treatment technology has great damag...

AI Technical Summary

Problems solved by technology

[0004]An important function of organic coatings is to block H2O, O2 and Cl- intrusion, however, once a defect occurs, the corrosion particles will easily reach the metal surface and localized corrosion will occur, that is, the protective effect of the pure organic coating on the metal substrate cannot last, which greatly limits its application in engineering. application

In addition, the coating prepared by the traditional dip coating method or spin coating method is limited by thickness and uniformity, and cannot provide lasting protection to the metal substrate.

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