Nickel-chromium plated parts and method of manufacture

Abstract

The invention discloses a nickel-chromium plating part and a manufacturing method thereof. The nickel-chromium plating part includes a substrate, a pretreatment coating and a decorative layer. The pretreatment coating is deposited on the entire substrate, and a copper plate layer and a functional layer are formed on the pretreatment coating; the functional layer is formed on the copper plate layer; the functional layer includes a low potential nickel layer and a microporous nickel layer formed on the low potential nickel layer; and the decorative layer is formed on the microporous nickel layer. Based on the micropores on the part surface and chrome plating technology, the low potential nickel layer is added to improve the corrosion resistance of the product, especially the corrosion resistance of trivalent chromium plating product, so as to promote the large scale popularization and application of the trivalent chromium product, which has better environmental protection performance.

Description

technical field [0001] The invention relates to a workpiece with a surface electroplating layer structure and its electroplating technology, in particular to a nickel-chrome plated part and its manufacturing method. [0002] In this application, the potential difference is the difference between the standard potentials measured by taking each of the two adjacent layers as a whole. Background technique [0003] The European market has increasingly stringent environmental protection requirements, and automobile factories have higher and higher requirements for electroplating corrosion resistance. At present, chromium electroplating cannot meet the corrosion requirements of specific environments (at the same time, it can meet the salt spray resistance test of 80h and the Russian mud resistance test. 336h). [0004] In the electroplating industry, the method of firstly plating double-layer nickel or triple-layer nickel and then chromium plating is generally used to improve the ...

AI Technical Summary

Problems solved by technology

Due to the use of microporous nickel or microcracked nickel alone, the improvement of corrosion resistance is limited; and the combination of microcracks and trivalent chromium has problems such as poor appearance, resulting in inapplicability for products with high corrosion resistance requirements

At the same time, in some existing technologies, it is disclosed to change the microporous nickel process to achieve noble potential characteristics, so as to meet the corrosion resistance requirements of trivalent chromium, but this process technology cannot achieve collinear production with hexavalent chromium and trivalent chromium. All components meet high-quality corrosion-resistant requirements

[0005] In the prior art, for example, the Chinese patent application (publication number: CN 101988211 A) relates to a multi-layer nickel plating process on metal surfaces with excellent anti-corrosion performance. The electroplating process flow is: A. metallization of the surface of plastic parts, B. bright copper , C. semi-bright nickel, D. high-sulfur nickel E. bright nickel, F. microporous nickel, G. washing, H. bright chromium, I. washing, J. drying; although the four-layer nickel is used in this technical scheme The electroplating of nickel electroplating solution on the plastic surface improves the corrosion resistance of plastic parts to a certain extent, but the corrosion resistance of this process is still not as good as that containing deicing salt (CaCl 2 ) Requirements for corrosive environment

And about the technique of introducing micro-crack nickel, as Chinese patent application (publication number: CN101705508A) relates to a kind of electroplating solution and application thereof for micro-crack nickel electroplating, the main composition of this micro-crack nickel electroplating solution is as follows: nickel chloride: 180-260 g / L, acetic acid: 20-60 mL / L, ELPELYT MR: 80-120 mL / L, 62A: 1-5 mL / L, the evaluation of the examples described in the patent literature is actually limited to hexavalent chromium plating , did not talk about trivalent chromium plating, and at the same time, it was verified that there were phenomena such as poor corrosion resistance and inconsistent appearance

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