Method for preparing nichrome composite coating in environment-friendly trivalent chromium plating solution

A nickel-chromium alloy and composite coating technology is applied in the field of preparing a nickel-chromium alloy composite coating in an environment-friendly trivalent chromium plating solution, which can solve the problems of not mentioning the aesthetic modification and corrosion resistance of the coating, and the low thickness of the coating. Simple operation, continuous and uniform electroplating effect

Inactive Publication Date: 2011-05-04
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both of the above two patents do not mention the aesthetic modification and corrosion resistance of the obtained coating, a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Prepare the electroplating solution in the electroplating tank, the content is as follows:

[0041] CrCl 3 ·6H 2 O: 75g / L, NiSO 4 ·6H 2 O: 50g / L, NiCl 2 ·6H 2 O: 45g / L, NH 4 C1: 50g / L, KBr: 12.5g / L, H 3 BO 3 : 50g / L, sodium citrate: 130g / L, sodium formate: 62.5g / L, urea: 62.5g / L, sodium lauryl sulfate: 0.2g / L.

[0042] (2) Electroplating conditions:

[0043] The temperature is 25°C and the current density is 25A / dm 2 , the stirring method is mechanical stirring and the rotation speed is 100r / min, and the pH value of the plating solution is adjusted with hydrochloric acid or sulfuric acid and sodium hydroxide or ammonium sulfate.

[0044] (3) The anode is made of a carbon rod with a diameter of 8mm. Before electroplating, it is smoothed with sandpaper, rinsed with distilled water to remove surface impurities, and dried before use. The cathode is made of copper sheet, and its specification is 20mm×10mm×0.5mm, so that the ratio of the area of ​​the cathode t...

Embodiment 2

[0048] (1) The anode is a carbon rod with a diameter of 8 mm. Before electroplating, it is polished with sandpaper, rinsed with distilled water to remove surface impurities, and dried before use.

[0049] (2) The cathode is made of copper sheet, and its specification is 20mm×10mm×0.5mm, so that the ratio of the area of ​​the cathode to the anode is kept at S 阳 : S 阴 =1.4:1 or so. The cathode treatment process is: single-sided copper sheet → 200-mesh water sandpaper grinding → 600-mesh water sandpaper grinding to smooth and bright → alkali washing and degreasing → water washing → drying → weighing → activation → electroplating → take out the plated parts after the specified time.

[0050] (3) Constant temperature water bath 25 ℃, adjust the pH=2.50 of plating solution among the embodiment 1, the mechanical stirring speed is 100r / min, and the direct current electroplating current density is 25A / dm 2 , DC electroplating for 4 hours, you can get a bright, uniform nickel-chromium...

Embodiment 3

[0053] (1) Prepare the electroplating solution in the electroplating tank, CrCl 3 ·6H 2 O is 78g / L, and other components and content are with embodiment 1.

[0054] (2) electroplating condition: with embodiment 1.

[0055] (3) The anode is made of a carbon rod with a diameter of 8mm. Before electroplating, it is smoothed with sandpaper, rinsed with distilled water to remove surface impurities, and dried before use. The cathode is made of copper sheet, and its specification is 20mm×10mm×0.5mm, so that the ratio of the area of ​​the cathode to the anode is kept at S 阳 : S 阴 =1.4:1 or so. The cathode treatment process is: single-sided copper sheet → 200-mesh water sandpaper grinding → 600-mesh water sandpaper grinding to smooth and bright → alkali washing and degreasing → water washing → drying → weighing → activation → electroplating → take out the plated parts after the specified time.

[0056] (4) Constant temperature water bath at 25°C, adjust pH=2.50, mechanical stirrin...

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Abstract

The invention discloses a method for preparing a nichrome composite coating in environment-friendly trivalent chromium plating solution. A specific-content composite coordination agent is added into basic plating solution containing chromic chloride, nickel sulfate and nickel chloride, so that nickel and chromium are co-precipitated on the surface of a metal, and the nichrome composite coating with flat surface and firm combination with a base material is prepared. The method has the advantages that: the prepared nichrome composite coating has the thickness of 30-210 micrometers; compared with a chromium coating, the nichrome composite coating has higher rigidity, high corrosion resistance and excellent decoration performance; and the plating solution can be recycled to contribute to protecting environment.

Description

technical field [0001] The invention belongs to the technical field of nickel-based composite electroplating, in particular to a method for preparing a nickel-chromium alloy composite coating in an environment-friendly trivalent chromium plating solution. Background technique [0002] Electrodeposited nickel-chromium alloys have many excellent properties such as wear resistance, corrosion resistance, and high electrical resistance. The chromium content in the coating is different, and its performance is also very different. If the chromium content in the nickel-chromium alloy coating reaches a certain level, a layer of chromium amorphous structure is formed on the surface, and the coating has high corrosion resistance, which is comparable to or even better than stainless steel with similar chromium content. The performance of the deposited nickel-chromium alloy is comparable to that of the forged nickel-chromium alloy. It can be used as a chromium substitute coating for par...

Claims

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Application Information

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IPC IPC(8): C25D3/56C25D5/34
Inventor 杜登学张志鹏周磊李文鹏
Owner QILU UNIV OF TECH
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