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High-brightness high-corrosion-resistance high-wear resistance nano compound electroplating layer composition

A nano-composite, electroplating technology, applied in coatings, electrolytic coatings, etc., can solve the problems of extinction, corrosion resistance, brittle coating, etc., to reduce production costs, improve corrosion resistance, and be easily popularized. Effect

Inactive Publication Date: 2002-11-20
重庆阿波罗机电技术有限公司
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

Later, composite plating was used for decorative plating, so there were nickel seals and forged nickel, etc., but they could not impart wear resistance at the same time. If the particle content in the coating was increased to increase its wear resistance, matting would occur and could not be obtained. The high-gloss coating sometimes even backfires, the coating becomes brittle, and the corrosion resistance is also reduced. Therefore, there is no combined coating that is bright, wear-resistant, corrosion-resistant and tough, and there are no patents or even research papers on related processes. report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: plate dark nickel 1.5 μm with standard Watt electrolytic solution, then electroplate composite nickel by following process formula and condition: nickel sulfate (NiSO 4 ·6H 2 O) 350g / L, boric acid 40g / L, sodium chloride 15g / L, α-Al 2 o 3 Composite nano slurry (primary grain size of nanoparticles is 65nm) 120g / L (solid), PH4.0, Dk3.5A / dm 2 t°C 60, electroplating composite nickel coating 7μm, nickel sulfate 350g / l, then electroplating bright nickel layer 4μm according to the conventional bright nickel process specification, and finally chromium plating 0.25μm, the obtained coating was evaluated by 24hCASS test. The corrosion resistance level is 9 / 8, and the defect area 0.07%, wear rate 0.003%, micro Vickers hardness value (HV0.1) 597.

Embodiment 2

[0024] Embodiment 2: test process is identical with example 1, wherein α-Al 2 o 3 The content of the composite nano-slurry (primary grain size of nano-particles is 65nm) is 80g / L (solid), and the obtained coating is evaluated as 9 / 8 by the 24hCASS test for corrosion resistance, with a defect area of ​​0.08%, wear rate of 0.006%, and micro-Vickers hardness Value (HV0.1) 596, its corrosion resistance and hardness almost unchanged, only a slight increase in wear rate.

[0025] Comparative experiment: According to the conventional high corrosion resistance three-layer nickel process (dark nickel / semi-bright nickel / high sulfur nickel / bright nickel), the total thickness of the coating is 25 μm, and then a 0.25 μm chromium layer is plated. The obtained coating is evaluated by 24hCASS test. The corrosion grade is 7 / 6, the defect area is 0.3%, the wear rate is 0.65%, and the micro Vickers hardness value (HV0.1) is 462, its corrosion resistance and hardness are much lower than the comp...

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Abstract

The present invention relates to a high-brightness high corrosion resistance high wearability composite plating layer composite whose total thickness is less than 13 micrometers includes dark nickel / nano composite nickel / bright nickel / chrome, and its electroplating method includes the following steps: firstly, plating dark nickel with thickness of 1.5-2.0 micrometers, plating nano composite nickel with thickness of 5-8 micrometers, plating bright nickel with thickness of 3-4 micrometers and plating chrome with thickness of 0.25-0.5 micrometer so as to obtain the invented plating layer composition, in which the nano composite nickel-plated layer contains 3-10% of composite oxide using alpha-Al2O3 as main crystal phase and with grain size of 40-80 nm, and is formed by means of electrodeposition in conventional electrolytic bath.

Description

(1) Technical field [0001] The invention relates to a new combination of coatings capable of obtaining both decoration and corrosion-resistant and wear-resistant functions and a new electroplating process. This coating combination can not only meet the purpose of high-brightness decorative electroplating, but also meet the requirements of decorative protection for products with high wear resistance, high corrosion resistance or corrosion resistance and wear resistance at the same time. (2) Technical background [0002] Since the 1960s, in order to obtain high corrosion-resistant coatings, Ambit Corporation of the United States invented multi-layer electroplating, from double nickel one to today's three-layer nickel and four-layer nickel, in order to improve the corrosion resistance of decorative coatings; In order to improve the function of the electroplating layer, during the same period, Tadao Hayashi and others in Japan made every effort to promote the development of comp...

Claims

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Application Information

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IPC IPC(8): C25D5/14C25D15/00
Inventor 李声泽陈敬全
Owner 重庆阿波罗机电技术有限公司
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