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Method for chemical plating nickel-phosphorus alloy on surface of magnesium alloy

A technology of surface chemistry and magnesium alloy, which is applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve the problems that it is not easy to obtain nickel-phosphorus alloy with good appearance, the process parameters are easy to get out of control, and the operating temperature is high. Good decoration, improve appearance and reduce pollution

Inactive Publication Date: 2008-10-01
周学华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, during pickling with chromic acid, hexavalent chromium is a strong carcinogen and poor in environmental protection; when dipping in alkaline solution, the operating temperature is high and the process parameters are easy to get out of control, and it is not easy to obtain a good-looking nickel-phosphorus alloy on the surface of magnesium alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for electroless nickel-phosphorus alloy plating on the surface of a magnesium alloy, comprising the steps of:

[0028] 1) Degreasing: Degreasing the magnesium alloy in a phosphorus-free alkaline degreasing solution at 55°C;

[0029] 2) Pickling: Under the condition that the reaction temperature is 40°C, a mixed solution of 5 parts of lactic acid, 3 parts of tartaric acid, 2 parts of citric acid, 1 part of sodium benzenesulfonate and 1000 parts of water is used as the magnesium alloy pickling solution. Wash to remove the oxide film on the surface of the magnesium alloy, rinse with water after pickling;

[0030] 3) Surface adjustment: the magnesium alloy after pickling is subjected to surface adjustment in an alkaline surface adjustment solution at 80°C;

[0031] 4) Activation: Activate the surface-adjusted magnesium alloy in 400g / L hydrofluoric acid solution for 2 minutes, and then rinse it with water;

[0032] 5) Acid zinc dipping: the activated magnesium all...

Embodiment 2

[0035] A method for electroless nickel-phosphorus alloy plating on the surface of a magnesium alloy, comprising the steps of:

[0036] 1) Degreasing: Degreasing the magnesium alloy in a phosphorus-free alkaline degreasing solution at 65°C;

[0037] 2) Pickling: Under the condition that the reaction temperature is 50°C, use a mixed solution of 20 parts of lactic acid, 20 parts of tartaric acid, 20 parts of citric acid, 20 parts of glycine, 10 parts of sodium lauryl sulfate and 1000 parts of water as magnesium Alloy pickling solution, pickling to remove the oxide film on the surface of the magnesium alloy, rinse with water after pickling;

[0038] 3) Surface adjustment: surface adjustment is performed on the magnesium alloy after pickling in an alkaline surface adjustment solution at 90° C., and then rinsed with water;

[0039] 4) Activation: Activate the surface-adjusted magnesium alloy in 400g / L hydrofluoric acid solution for 2 minutes, and then rinse it with water;

[0040]...

Embodiment 3

[0043] A method for electroless nickel-phosphorus alloy plating on the surface of a magnesium alloy, comprising the steps of:

[0044] 1) Degreasing: Degreasing the magnesium alloy in a phosphorus-free alkaline degreasing solution at 60°C;

[0045] 2) Pickling: Under the condition that the reaction temperature is 45°C, use a mixed solution of 10 parts of lactic acid, 10 parts of tartaric acid, 10 parts of citric acid, 10 parts of glycine, 5 parts of sodium lauryl sulfate and 1000 parts of water as magnesium Alloy pickling solution, pickling to remove the oxide film on the surface of the magnesium alloy, rinse with water after pickling;

[0046] 3) Surface adjustment: surface adjustment is performed on the magnesium alloy after pickling in an alkaline surface adjustment solution at 100° C., and then rinsed with water;

[0047] 4) Activation: activate the surface-adjusted magnesium alloy in 400g / L hydrofluoric acid solution for 2.5 minutes, and then rinse it with water;

[004...

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PUM

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Abstract

The invention relates to a method of electroless Ni-P alloy on surface of magnesium alloy, comprising following steps: (1) degreasing: the magnesium alloy is degreased in non-phosphate alkaline degreasing solution with a temperature of 55 deg C to 65 deg C; (2) acid cleaning: a mixture of organic acid and anionic surfactant is used as magnesium alloy acid cleaning solution instead of traditional chromic acid solution to remove oxide film of the surface of the magnesium alloy; (3) surface conditioning: the acid cleaned magnesium alloy is processed surface conditioning in alkaline surface conditioning solution with a temperature of 80 deg C to 100 deg C; (4) activating: the surface conditioned magnesium alloy is processed activation in HF solution; (5) acid dipping zinc; (6) nickel plating: in a condition that the temperature is 80 deg C to 90 deg C and ph value is in the range of 5 to 6, a brightener is added into electroless nickel solution to process nickel plating reaction Ni-P alloy coating. The invention has following beneficial effects: (1) reducing pollution for environment and damage for bodies of operators, and at the same time, easily controlling the operation and uneasily losing control for process parameters; (2) improving appearance of the Ni-P alloy coating, and being provided with better decorative.

Description

technical field [0001] The invention relates to a method for chemically treating the surface of a metal material, in particular to a method for chemically plating nickel-phosphorus alloy on the surface of a magnesium alloy. Background technique [0002] Magnesium alloy has the advantages of light weight, good shock absorption performance, and easy recycling. But its poor corrosion resistance limits the large-scale application of magnesium alloys. Electroless nickel plating is one of the effective ways to improve the corrosion resistance of magnesium alloys. The traditional process includes the following steps: 1) degreasing; 2) pickling with chromic acid; 3) surface adjustment; 4) activation with hydrofluoric acid solution; 5) zinc dipping with alkaline solution; 6) nickel plating . In this process, the pre-treatment adopts chromic acid pickling and alkaline solution zinc dipping. Among them, during pickling with chromic acid, hexavalent chromium is a strong carcinogen a...

Claims

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Application Information

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IPC IPC(8): C23C18/32C23C18/18C23C18/30
Inventor 贺东奎陈开生周学华
Owner 周学华
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