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Method for plating chromium by using trivalent chromium

A technology of trivalent chromium and plated parts, which is applied in the field of electrochemistry, can solve problems such as unfavorable clean production in the electroplating industry, and achieve the effect of improving wear resistance

Inactive Publication Date: 2010-06-23
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chloride solution system and the sulfate-chloride mixed solution system are used for chrome plating, and the anode will affect the environment due to the generation of chlorine gas, which is not conducive to the clean production of the electroplating industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 2.9320g of lanthanum oxide in a 100mL small beaker, add 15mL of concentrated nitric acid under stirring, heat to dissolve it, and after it cools down, transfer it to a 50mL volumetric flask and dilute to the mark with water. The concentration of lanthanum in the solution is 50g / L.

[0026] Add 200g of chromium sulfate, 150g of aluminum sulfate, 30g of sodium fluoride, 30g of urea, 15g of formic acid, and 15g of citric acid into a 1L beaker, add 985mL of water to dissolve, add 1mL of the above solution with a concentration of lanthanum of 50g / L, stir well, and use Adjust the pH value of the solution to 1 with sodium bicarbonate solution, transfer it into a 1L volumetric flask, and dilute to the mark with water to prepare the electroplating solution.

[0027] Transfer the above electroplating solution into a 1L beaker, put the 80mm×80mm×0.5mm steel plate to be plated into the electroplating solution as the cathode, and the anode as the 150mm×100mm×2mm Ir-Ta oxide-co...

Embodiment 2

[0031] Weigh 1.1664g of neodymium oxide in a 100mL small beaker, add 6mL of concentrated nitric acid under stirring, heat to dissolve it, and after it cools down, transfer it to a 50mL volumetric flask and dilute to the mark with water. The concentration of neodymium in the solution is 20g / L.

[0032] Add 400g potassium chromium sulfate, 300g aluminum sulfate, 50g sodium fluoride, 300g urea, 100g tartaric acid into a 1L beaker, add 935mL water to dissolve, add 50mL of the above-mentioned solution with a concentration of neodymium of 20g / L, stir well, and use sodium bicarbonate Adjust the pH value of the solution to 2, transfer it into a 1L volumetric flask, and dilute to the mark with water to prepare an electroplating solution.

[0033] Transfer the above electroplating solution into a 1L beaker, put the 80mm×80mm×0.5mm steel plate to be plated into the electroplating solution as the cathode, and the anode as the 150mm×100mm×2mm Ir-Ta oxide-coated Ti plate, magnetically stir ...

Embodiment 3

[0037] Weigh 2.8948g of europium oxide in a 100mL small beaker, add 15mL of concentrated nitric acid under stirring, heat to dissolve it, and after it cools down, move it to a 50mL volumetric flask and dilute to the mark with water. The concentration of europium in the solution is 50g / L.

[0038] Add 300g potassium chromium sulfate, 250g aluminum sulfate, 35g sodium fluoride, 200g urea, 50g aminoacetic acid into a 1L beaker, add 935mL water to dissolve, add 50mL of the above-mentioned solution with a concentration of europium of 50g / L, stir well, and use bicarbonate Adjust the pH value of the solution to 3 with sodium solution, transfer it into a 1L volumetric flask, and dilute to the mark with water to prepare the electroplating solution.

[0039] Transfer the above electroplating solution into a 1L beaker, put the 80mm×80mm×0.5mm steel plate to be plated into the electroplating solution as the cathode, and the anode as the 150mm×100mm×2mm Ir-Ta oxide-coated Ti plate, magneti...

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Abstract

The invention discloses a method for plating chromium by using trivalent chromium. The method comprises that rare earth oxide is dissolved in acid and is prepared into rare earth salt solution; water is used to dissolve chromium sulfate salt, aluminum sulfate, sodium fluoride, urea and complexing agent, the obtained mixture is added with the obtained rare earth salt solution, sodium hydrogen carbonate solution is used to adjust the pH value of the solution and the obtained solution is prepared into plating solution containing chromium sulfate salt, aluminum sulfate, sodium fluoride, urea, complexing agent and rare earth salt; a part to be plated is put into the plating solution and is plated, and the technological conditions for plating control are that: current density is 28-90A / dm2, the pH value of the plating value is 1-4, the temperature is 25-60 DEG C, the agitator speed is 100-600rpm and the plating time is 30-90min; and after the plating is completed, the plated part is washed by water and is air-dried, so the plating of the part to be plated by using the trivalent chromium is completed. The rigidity and the wear resistance of the obtained chromium-plated layer are obviously improved, the rigidity is more than or equal to 815HV and the wear mass is less than or equal to 0.08mg.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, that is, the invention relates to a method for plating chromium with trivalent chromium. Background technique [0002] Chrome plating has good hardness, wear resistance, corrosion resistance and decorative appearance. It is not only used for decorative coatings, but also widely used for functional coatings, so it is listed as one of the three major plating types. The chromic acid in the traditional hexavalent chromium solution is highly toxic, is a strong carcinogen, and causes great environmental pollution. In order to replace the hexavalent chromium plating process, a lot of research has been done on trivalent chromium plating. The current trivalent chromium plating systems mainly include sulfate solution system, chloride solution system and sulfate-chloride mixed solution system. Chromium plating with chloride solution system and sulfate-chloride mixed solution system will affect th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/06
Inventor 刘小珍陈捷
Owner SHANGHAI INST OF TECH
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