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High-performance chromium plating process used for hardware product

A high-performance, product technology, applied in the field of hardware chrome electroplating, can solve the problems of unsatisfactory corrosion resistance of the coating, large porosity of the chromed layer structure, and reduced chromium concentration, etc., and achieves reasonable design of process steps and number of micro-cracks in the coating. More, good corrosion resistance effect

Inactive Publication Date: 2017-05-31
SHAOXING KOUFU FOOD
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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 high-performance chrome plating process for hardware products, 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 p...

Embodiment 2

[0075] A high-performance chrome plating process for hardware products, 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 proce...

Embodiment 3

[0108] A high-performance chrome plating process for hardware products, 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 proce...

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PUM

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Abstract

The invention discloses a high-performance chromium plating process used for a hardware product. The process comprises the steps of degreasing, steam treatment, shot blasting treatment, dewaxing, oil removal, acid copper plating bottoming, nickel plating bottoming, gold plating nickel brightening, chromic acid bath return etching, chromium plating, passivation, blowing and baking; in the process, repeated cleaning and acid activation are carried out. According to the high-performance chromium plating process used for the hardware product, the plating layer deposition speed is high, the number of plating layer micro-cracks is more, the plating has the better corrosion resistance, the chromium plating layer treated through the process is higher than a traditional standard chromium plating layer in hardness, under the condition that the combination force is qualified, the better wear resistance and corrosion resistance are achieved, and the service life of a workpiece can be obviously prolonged.

Description

technical field [0001] The invention relates to the technical field of hardware electrochrome plating, in particular to a high-performance chrome plating process for hardware products. 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 rem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/14C25D15/00C25D3/06C25D3/40C25D5/34C25D5/48
CPCC25D5/14C25D3/06C25D3/40C25D5/34C25D5/48C25D15/00
Inventor 黄奇涵
Owner SHAOXING KOUFU FOOD
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