Black surface composite coating and preparation method thereof

Abstract

The invention discloses a black surface composite coating and a preparation method thereof. The black surface composite coating is formed by sequentially plating an electrocoppering layer, a black nickel layer and a hexavalent black chromium layer on the surface of a base material. The method comprises the following steps of (i), carrying out electroplating pretreatment, specifically, cleaning thesurface of a metal substrate; (ii), electroplating a copper layer, namely plating the copper layer on the clean base material obtained in the step (i); (iii), electroplating the black nickel layer, and carrying out black nickel electroplating treatment on the clean copper layer obtained in the step (ii); and (iv), electroplating the black chromium layer, and carrying out black chromium electroplating treatment on the clean black nickel layer obtained in the step (iii). The black coating prepared by the method not only has matte black color, but also has the advantages of corrosion resistanceand high hardness.

Description

technical field [0001] The invention relates to a black surface composite coating and a preparation method thereof. Background technique [0002] In order to meet the anti-corrosion performance requirements of traditional kitchen and bathroom hardware products, the surface is basically coated with white chrome, showing a single metallic tone. Since 2018, with the development of kitchen and bathroom products in the direction of fashion, functionality, and intelligence, and the black post-modern industrial style has become popular all over the world, black kitchen and bathroom products have become more and more popular among consumers, and Kohler , Gaoyi, Hansgrohe and other well-known international sanitary ware companies are competing to develop one of the important directions. At present, black kitchen and bathroom hardware products are mainly realized through surface baking varnish technology, that is, a layer of black paint is sprayed on the surface of kitchen and bathro...

AI Technical Summary

Problems solved by technology

[0004] Both baked black paint products and electroplated hexavalent black chrome can obtain a high-blackness appearance, but the existing high-blackness black products have poor scratch resistance. The plating layer falls off, resulting in the exposure of the underlying substrate; the black new material product made of water mist nickel + hexavalent black chrome encounters a sharp product, and the surface of the top layer of black chromium is easy to scratch, and the bottom water mist nickel material is easy to see. There is an obvious difference in the color contrast between the bottom water mist nickel layer and the surface black chrome layer

Images