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Extra-hardness chrome plating additive and application thereof

An additive and hardness technology, applied in the field of electrochrome plating, can solve the problems of increased labor intensity, cumbersome process, and fast accumulation of impurities, etc., and achieve the effect of eliminating the need for mechanical polishing process, simple process operation, and bright and meticulous coating

Active Publication Date: 2019-03-29
CHONGQING LIDAO SURFACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional hard chrome plating is obtained from standard chrome plating solution. The standard chromium is characterized by insufficient hardness (about 600-750HV), which cannot meet the hardness requirements of some workpieces and requires subsequent heat treatment.
In addition, the standard chromium plating is not bright and fine, and generally requires mechanical polishing, which undoubtedly makes the process cumbersome, increases the labor intensity of workers, and greatly reduces production efficiency.
Although adding fluorine ions or fluosilicic acid to the standard chrome plating solution can increase the current efficiency, and the bright area can expand to the high temperature and high current area, but the fluorine ions are very corrosive to the anode and the coating substrate, so the solution The accumulation of impurities is fast, the process is difficult to control, and it also makes the plating tank prone to aging and scrapping

Method used

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  • Extra-hardness chrome plating additive and application thereof
  • Extra-hardness chrome plating additive and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare ultra-high hardness chrome plating additives according to the following weight concentration:

[0033] Sodium methylene disulfonate: 10g / L

[0034] Cerium sulfate: 0.1g / L

[0035] Sodium tungstate: 0.5g / L;

[0036] The above components are mixed to obtain the composite chrome plating additive of this embodiment.

[0037] The standard chromium plating solution contains 220g / L chromic anhydride, 2.2g / L sulfuric acid, and 3g / L trivalent chromium. The above-mentioned ultra-high hardness chromium plating additives are added to the standard chromium electroplating solution. Process parameters: current density 60A / dm 2 , the temperature is 55°C, the ratio of anode to cathode area is greater than 2:1, and the electroplating time is 1 hour. Select an iron-based rod-shaped piece with a diameter of 10mm and a length of 100mm (substrate surface roughness Ra≤0.1) for plating, and inspect the coating.

[0038] The test results show that the coating is bright and fine, t...

Embodiment 2

[0045] Prepare ultra-high hardness chrome plating additives according to the following weight concentration:

[0046] Methanesulfonic acid: 5g / L

[0047] Formic acid: 5g / L

[0048] Cerium sulfate: 0.05g / L

[0049] Sodium molybdate: 1g / L;

[0050] The above components are mixed to obtain the composite chrome plating additive of this embodiment.

[0051] The standard chromium plating solution contains 220g / L chromic anhydride, 2.2g / L sulfuric acid, and 3g / L trivalent chromium. The above-mentioned ultra-high hardness chromium plating additives are added to the standard chromium electroplating solution. Process parameters: current density 60A / dm 2 , the temperature is 55°C, the ratio of anode to cathode area is greater than 2:1, and the electroplating time is 1 hour. Select an iron-based rod-shaped piece with a diameter of 10mm and a length of 100mm for plating, and inspect the coating.

[0052] The test results show that the coating is bright and fine, the Vickers hardness...

Embodiment 3

[0056] Prepare ultra-high hardness chrome plating additives according to the following weight concentration:

[0057] Methanesulfonic acid: 5g / L

[0058] Sodium methylene disulfonate: 5g / L

[0059] Cerium sulfate: 0.1g / L

[0060] Sodium tungstate: 1g / L;

[0061] The standard chromium plating solution contains 220g / L chromic anhydride, 2.2g / L sulfuric acid, which contains 3g / L. The above-mentioned ultra-high hardness chromium plating additives are added to the standard chromium electroplating solution. Process parameters: current density 60A / dm 2 , the temperature is 55°C, the ratio of anode to cathode area is greater than 2:1, and the electroplating time is 1 hour. Select an iron-based rod-shaped piece with a diameter of 10mm and a length of 100mm for plating, and inspect the coating.

[0062] The test results show that the coating is bright and fine, the Vickers hardness is stable above 1150HV, the brightness of the coating is basically stable at grade I, and the thickn...

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Abstract

The invention relates to an extra-hardness chrome plating additive. The extra-hardness chrome plating additive comprises organic compounds containing single carbon atom, rare-earth cerium salts and VIB family oxysalts, wherein the mass ratio of the organic compounds containing the single carbon atom to the rare-earth cerium salts to the VI B family oxysalts is 1-5:0.002-0.1:0.02-0.04. Adding theadditive into the standard chrome plating solution for use, an obtained coating has a high hardness of 1150-1250HV, and meanwhile, the coating is good in brightness and has characteristics of omittingsubsequent mechanical polishing. No halogen family elements such as F are contained in the additive, the covering power and the current efficiency of the plating solution containing the additive arehigh, the plating solution has little corrosion to an anode, the operation process is simple, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of electrochrome plating, and relates to an ultra-high hardness chrome plating additive and its application. Background technique [0002] As early as 1856, the Germans invented the deposition of chromium metal from a chromium solution. It was not until 1926 that Professor C.G.Fh and others in the United States invented the patent for depositing bright chromium from a chromic acid solution containing sulfuric acid, and the chromium plating process was truly real. It is widely used in industrial production; in 1925, Fink and Eldridge proposed the electroplating chromium process, pointing out that CrO 3 and SO 4 2- When the ratio relationship was 100:1, the commercial chrome plating technology was developed, and gradually formed what was later called the standard chrome plating process. However, the standard chromium plating process has the disadvantages of low current efficiency (8%-15%), poor deep plating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/04
CPCC25D3/04
Inventor 胡国辉肖春艳包海生刘军李礼
Owner CHONGQING LIDAO SURFACE TECH
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