Chromium-plating manufacturing method for metal product

A manufacturing method and technology for metal products, applied in the direction of metal material coating process, etc., can solve the problems of unsatisfactory corrosion resistance of the coating, large porosity of the chrome layer structure, easy rust and aging, etc. The effect of a large number of micro-cracks in the coating and prolonging the service life

Inactive Publication Date: 2017-05-10
新昌县优优机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] If the hardware products are not electroplated, they are easy to rust and age, and the surface is not wear-resistant and not beautiful
Existing studies have shown that by properly adding Cr3+ to the plating solution, reducing the concentration of chromium, and appropriately increasing the ratio of sulfuric acid to chromium, the hardness of the chromium plating layer can be easily increased from about 750HV of traditional hard chrome plating to 115OHV. The structure porosity of the chromium plating layer obtained by this method is relatively large, and the corrosion resistance of the coating is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for manufacturing metal products by chrome plating, the steps are as follows:

[0043] 1) Degreasing: immerse the hardware to be plated in an alkaline degreasing agent at 68°C for 35 minutes, and the pH value of the alkaline degreasing agent is 8;

[0044] 2) The first cleaning: use sodium hydroxide solution with a pH value of 8 to clean the hardware to be plated, and use ultrasonic waves to dry;

[0045] 3) Steam treatment: put the hardware to be plated in a steam furnace at 500°C, make the temperature in the furnace drop sharply to 280°C, and then heat it to 500°C, feed steam at a flow rate of 0.15MPa / s and keep it in the furnace 0.24MPa constant pressure, heat again to 580°C, keep warm for 50 minutes, then cool down to 480°C, stop steaming and keep warm for 50 minutes, take out the furnace and cool to room temperature;

[0046] 4) Shot blasting treatment: put the hardware to be plated into the shot blasting machine for shot blasting treatment, and the proce...

Embodiment 2

[0075] A method for manufacturing metal products by chrome plating, the steps are as follows:

[0076] 1) Degreasing: immerse the hardware to be plated in an alkaline degreasing agent at 69°C for 37 minutes, and the pH value of the alkaline degreasing agent is 10;

[0077] 2) The first cleaning: use sodium hydroxide solution with a pH value of 11 to clean the hardware to be plated, and use ultrasonic to dry;

[0078] 3) Steam treatment: put the hardware to be plated in a steam furnace at 505°C, make the temperature in the furnace drop sharply to 290°C, and then heat it to 505°C, feed steam at a flow rate of 0.15MPa / s and keep it in the furnace 0.24MPa constant pressure, heat again to 590°C, keep warm for 50 minutes, then cool down to 480°C, stop steaming and keep warm for 55 minutes, take out the furnace and cool to room temperature;

[0079] 4) Shot blasting treatment: Put the hardware to be plated into the shot blasting machine for shot blasting treatment, and the processin...

Embodiment 3

[0108] A method for manufacturing metal products by chrome plating, the steps are as follows:

[0109] 1) Degreasing: immerse the hardware to be plated in an alkaline degreasing agent at 70°C for 40 minutes, and the pH value of the alkaline degreasing agent is 14;

[0110] 2) The first cleaning: use sodium hydroxide solution with a pH value of 14 to clean the hardware to be plated, and use ultrasonic to dry;

[0111]3) Steam treatment: put the hardware to be plated in a steam furnace at 510°C, make the temperature in the furnace drop sharply to 300°C, and then heat it to 510°C, feed steam at a flow rate of 0.15MPa / s and keep it in the furnace 0.24MPa constant pressure, heat again to 600°C, keep warm for 50 minutes, then cool down to 480°C, stop steaming and keep warm for 60 minutes, take out the furnace and cool to room temperature;

[0112] 4) Shot blasting treatment: Put the hardware to be plated into the shot blasting machine for shot blasting treatment, and the processing...

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PUM

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Abstract

The invention discloses a chromium-plating manufacturing method for a metal product. The method comprises the steps of degreasing, vapor treatment, shot blasting treatment, wax removal, oil removal, acidic-copper plating for bottoming, nickel plating for bottoming, golden nickel plating, returned etching conducted through a chromic acid plating solution, chromium plating, passivation, blowing and baking, wherein in the process, cleaning and acid activation are conducted for multiple times. When the method is applied to a high-performance chromium-plating process of the hardware product, a plating layer of the hardware product is high in deposition speed; the plating layer has a greater number of microcracks and better corrosion resistance; the hardness of the chromium-plating layer treated through the process is far higher than that of a chromium-plating layer treated according to traditional standards; and under the circumstance that binding force is qualified, better abrasion resistance and corrosion resistance are achieved, and the service life of a workpiece can be remarkably prolonged.

Description

technical field [0001] The invention relates to the technical field of metal electrochrome plating, in particular to a method for manufacturing metal products by chrome plating. Background technique [0002] If the hardware products are not electroplated, they are easy to rust and age, and the surface is not wear-resistant and not beautiful. At present, for hardware products, nickel plating or chrome plating is generally used. The chemical properties of metal chromium and metal nickel are relatively stable, and they are easily passivated in the air, and then form an extremely thin passivation film on the surface of steel products, which can better resist external corrosion. The chrome plating process has a lot to do with the strength and corrosion resistance of the coating, especially the pretreatment process of chrome plating has a great influence on the chromium layer. Many chrome plating failures are due to inadequate pretreatment work, such as degreasing, wax removal, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/14C25D5/34C25D5/48C25D3/38C25D3/12C25D3/04C23C22/48C25D3/02
CPCC25D5/14C23C22/48C25D3/02C25D3/04C25D3/12C25D3/38C25D5/34C25D5/48
Inventor 潘小良
Owner 新昌县优优机械有限公司
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