Method for treating surface of magnesium or alloy thereof

A surface treatment and alloy technology, applied in the field of surface treatment of magnesium or its alloys, can solve the problems of many pretreatment processes and difficult waste liquid treatment, and achieve the effects of simple process flow, shortened production time, and short treatment time.

Inactive Publication Date: 2006-09-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cr 6+ , HF and other chemical substances that are harmful to the human body and the environment, and there are many pre-treatment processes, which brings about the problem of difficult waste liquid treatment

Method used

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  • Method for treating surface of magnesium or alloy thereof
  • Method for treating surface of magnesium or alloy thereof
  • Method for treating surface of magnesium or alloy thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Get medicine according to following formula (quantity): oxalic acid 20g, phosphoric acid 20ml, ammonium bifluoride 50g, hexamethylenetetramine 3g, sodium laurylsulfonate 0.005g, after above-mentioned medicine is dissolved with a small amount of deionized water respectively Mix and dilute to one liter.

[0028] The magnesium alloy parts of four grades shown in the table below were degreased and then placed in a stirred chemical solution. From the test process, it can be seen that the reaction was stable and the hydrogen generated on the surface of the workpiece was removed in time. After 5 minutes, the workpiece was taken out and placed on an electronic balance. Weighing, comparison of the weight loss ratio of the workpiece before and after treatment (see Table 1) shows that the use of the treatment solution of the present invention has a moderate degree of corrosion on the magnesium alloy parts, and its loss rate is far lower than that of using the U.S. Dow process. fig...

Embodiment 2

[0032] Take medicine according to following formula weighing (quantity): oxalic acid 10g, phosphoric acid 50ml, ammonium bifluoride 100g, thiourea 5g, polyethylene glycol 0.001g, above-mentioned medicine is dissolved with a small amount of deionized water respectively and mixed and diluted to one liter.

[0033] Preparation of electroless nickel plating solution, the solution is composed of: nickel acetate 20g / L, sodium hypophosphite 20g / L, citric acid 5g / L, lactic acid 5ml / L, ammonium bifluoride 10g / L, ammonia water 30ml / L, saccharin 3g / L , thiourea 0.5mg / L, lead acetate 0.5mg / L, potassium iodide 50mg / L, and the balance is water.

[0034] After degreasing the magnesium alloy parts, place them in a stirred chemical solution. After 2 minutes, take out the workpieces, wash them with deionized water, put them into the 80°C electroless nickel plating solution prepared above, and observe them under a scanning electron microscope after plating for 2 hours. surface topography (see ...

Embodiment 3

[0037] Weigh (amount) the medicine according to the following formula: oxalic acid 50g, phosphoric acid 100ml, ammonium bifluoride 80g, citric acid 3g, sodium dodecylsulfonate 0.001g, dissolve the above-mentioned medicines with a small amount of deionized water respectively, mix and dilute to one Lift.

[0038] Prepare anodic oxidation solution, the solution composition is: potassium hydroxide 120g / L, sodium metaaluminate 30g / L, sodium tetraborate 110g / L, potassium fluoride 30g / L, sodium phosphate 30g / L. Anodizing process parameters are: temperature room temperature, voltage 80V, 10min.

[0039] After the magnesium alloy parts are degreased, they are placed in a stirring chemical solution. After 1 minute, the workpieces are taken out, rinsed with deionized water for 5 minutes, and placed in the above-mentioned anodizing solution to anodize the magnesium alloy parts for 10 minutes. Observe the surface topography (see Figure 5 ); According to the national standard GB / T6461-20...

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Abstract

This invention provides a method of surface treatment for magnesium or its alloy, which comprises the following steps: first, degreasing the surface of works, then immersing magnesium or its alloy into the treatment fluid and stirring the solution, the immersed temperature is indoor temperature, the immersed time is 0.5-10min. Said treatment fluid comprises 0.5%-10% oxalic acid, 0.5%-15% phosphorus acid, 1%-10% ammonium acid fluoride, 1%-3% inhibitor, 0.0005%-0.001% humectant by mass percent,and deionized water which is residual. Said inhibitor is one or more than of thiourea, hexamethylenetetramine and citric acid, and its proportioning is optional. Said humectant is sodium dodecyl sulfonate, OP-10 or carbowax. The invention has the merits such as high processing speed, simple process, less depletion and environmental protection.

Description

Technical field: [0001] The invention relates to a surface treatment method for removing oxide film, scale and stressed plastically deformed surface skin on the surface of magnesium and magnesium alloy workpieces with high efficiency, rapidity, low loss and high quality, and making the surface catalytically active. The process is simple, It is non-polluting to the environment and can be used as a pretreatment solution for surface treatment processes such as chemical plating, electroplating, anodizing, micro-arc oxidation, and chemical conversion coating. Background technique: [0002] Magnesium and its alloys are one of the lightest structural materials for engineering applications. They have high specific strength and specific stiffness, are non-magnetic, have excellent shielding electromagnetic interference capabilities, good cutting processing, electrical and thermal conductivity and damping properties, and high product recovery rates. It is non-toxic and non-polluting, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/04C23G1/12
Inventor 余新泉郑臻徐剑刚孙扬善薛烽
Owner SOUTHEAST UNIV
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