Outer covering protection layer structure of car decorating part

Abstract

The invention belongs to the technical field of car accessories, and provides an outer covering protection layer structure of a car decorating part. The outer covering protection layer structure of the car decorating part sequentially comprises a first layer, a second layer, a third layer, a fourth layer and a fifth layer from inside to outside, wherein the first layer is a semi-bright nickel layer; the second layer is a full-bright nickel layer; the third layer is a microcrack nickel layer; the fourth layer is a micropore nickel layer; the fifth layer is a decorative layer; the microcrack nickel layer and the micropore nickel layer are compounded together to form an anti-corrosion protection layer; the potential difference of the micropore nickel layer and the microcrack nickel layer ranges from 10 mv to 120 mv. The outer covering protection layer structure of the car decorating part has the advantages that the microcrack nickel layer and the micropore nickel layer are compounded together to form the anti-corrosion protection layer, so that the appearance brightness feature of the micropore nickel layer is ensured; due to the double anti-corrosion property of the micropore nickel and the microcrack nickel, products can achieve the ultra-high anti-corrosion performance.

Description

technical field [0001] The invention belongs to the technical field of auto parts, and relates to a car decoration outer covering protective layer structure for improving the corrosion resistance of products. Background technique [0002] The protective layer on the exterior of the existing automotive trim includes semi-bright nickel layer + bright nickel layer + crack-free chrome layer, or semi-bright nickel + bright nickel + microporous nickel + crack-free chrome layer, or semi-bright nickel layer + bright nickel layer + micro-crack nickel layer + crack-free chromium layer, but its own stress is large, it is difficult to obtain a chromium plating protection layer (including hexavalent chromium and trivalent chromium plating) without cracks or pores in the industry, exposed to air After the chromium electroplating protective layer is passivated, its potential is more positive than that of nickel. When it encounters the corrosive medium in the atmosphere, it will form a corr...

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Problems solved by technology

[0002] The protective layer on the exterior of the existing automotive trim includes semi-bright nickel layer + bright nickel layer + crack-free chrome layer, or semi-bright nickel + bright nickel + microporous nickel + crack-free chrome layer, or semi-bright nickel layer + bright nickel layer + micro-crack nickel layer + crack-free chromium layer, but its own stress is large, it is difficult to obtain a chromium plating protection layer (including hexavalent chromium and trivalent chromium plating) without cracks or pores in the industry, exposed to air After the chromium electroplating protective layer is passivated, its potential is more positive than that of nickel. When it encounters the corrosive medium in the atmosphere, it will form a corrosion battery with the nickel layer, resulting in a large number of irregularities in the decorative chromium electroplating protective layer in extreme environments. Regular corrosion, even the complete dissolution of the chromium electroplating protective layer, in order to further improve the anti-corrosion ability of the coating, a micro-cracked nickel layer is applied to the light nickel coating, and a high-stress special nickel layer is plated on the light nickel layer with micro-cracked nickel. When chrome plating, a large number of microcracks will be produced due to stress. Because the microcracked nickel layer is used alone, the surface of the product can be fogged and the brightness is poor, so the improvement of corrosion resistance is limited.

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