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Nickel-phosphorus nanometer silicon dioxide composite plating of magnesium alloy and method for preparing nickel-phosphorus nanometer silicon dioxide composite plating

A technology of nano-silica and composite coating, which is applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve the problem of high cost, and achieve the effect of low cost, cost reduction and corrosion reduction

Inactive Publication Date: 2016-08-24
CHINA WEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses basic nickel carbonate as nickel source, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The nickel-phosphorus nano-silicon dioxide composite coating of magnesium alloy is prepared by the following process:

[0027] (1) Pretreatment

[0028] Including mechanical grinding, degreasing, pickling and caustic cleaning; distilled or deionized water is used for rinsing or rinsing between each step.

[0029] Mechanical grinding uses 200#~1200# SiC water-based sandpaper to polish and level off on the polishing machine to remove mud, sand and oxide film, etc.;

[0030] Put the polished magnesium alloy parts in acetone for 10 minutes at room temperature, and then wash and soak them in alkaline solution for 15 minutes. The temperature of the alkaline solution is 55-65 degrees Celsius;

[0031] Described alkaline solution is the mixture of concentration 15g / L sodium hydroxide solution, 20g / L phosphate solution, 20g / L carbonate solution;

[0032] Pickling uses 100mL / L phosphoric acid solution for 90 seconds at room temperature; activates after pickling, and uses 10mL / L...

Embodiment 2

[0043] The nickel-phosphorus nano-silicon dioxide composite coating of magnesium alloy is prepared by the following process:

[0044] (1) Pretreatment

[0045] Including mechanical grinding, degreasing, pickling and caustic cleaning; distilled or deionized water is used for rinsing or rinsing between each step.

[0046] Mechanical grinding uses 200#~1200# SiC water-based sandpaper to polish and level off on the polishing machine to remove mud, sand and oxide film, etc.;

[0047] Put the polished magnesium alloy parts in acetone for 12 minutes at room temperature, and then wash and soak them in alkaline solution for 12 minutes. The temperature of the alkaline solution is 55-65 degrees Celsius;

[0048] Described alkaline solution is the mixture of concentration 60g / L sodium hydroxide solution, 15g / L phosphate solution, 40g / L carbonate solution;

[0049] Pickling with 300mL / L phosphoric acid solution at room temperature for 60 seconds; after pickling, activate with 300mL / L hyd...

Embodiment 3

[0060] The nickel-phosphorus nano-silicon dioxide composite coating of magnesium alloy is prepared by the following process:

[0061] (1) Pretreatment

[0062] Including mechanical grinding, degreasing, pickling and caustic cleaning; distilled or deionized water is used for rinsing or rinsing between each step.

[0063] Mechanical grinding uses 200#~1200# SiC water-based sandpaper to polish and level off on the polishing machine to remove mud, sand and oxide film, etc.;

[0064] Put the polished magnesium alloy parts into acetone for 15 minutes at room temperature, and then wash and soak them in an alkaline solution for 10 minutes. The temperature of the alkaline solution is 55 degrees Celsius;

[0065] Described alkaline solution is the mixture in concentration 45g / L sodium hydroxide solution, 5g / L phosphate solution, 30g / L carbonate solution;

[0066] Pickling with 500mL / L phosphoric acid solution at room temperature for 30 seconds; after pickling, activate with 30g / L ammo...

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Abstract

The invention relates to methods for treating magnesium alloy surfaces, in particular to nickel-phosphorus nanometer silicon dioxide composite plating of magnesium alloy and a method for preparing the nickel-phosphorus nanometer silicon dioxide composite plating. The method includes mechanical polishing, oil removing, acid washing and alkali washing pretreatment. Chemical plating includes two steps implemented by the aid of fluorine-containing plating solution A without nanometer silicon dioxide and nanometer-silicon-dioxide-containing plating solution B without fluorine. The nickel-phosphorus nanometer silicon dioxide composite plating and the method have the advantages that composite nanometer silicon dioxide is added into the plating solution B, so that the corrosion resistance of the nickel-phosphorus nanometer silicon dioxide composite plating can be enhanced; preparation of nanometer oxide concentrated solution or pretreatment on the nanometer silicon dioxide can be omitted, inexpensive nickel sulfate hexahydrate is used as major salt, only the fluorine-containing plating solution is applied at the first step in plating processes, the plating solution for the second step does not contain fluoride, accordingly, the usage of fluorine can be effectively reduced, and the cost can be lowered.

Description

technical field [0001] The invention relates to a surface treatment method of a magnesium alloy, in particular to a nickel-phosphorus nano-silicon dioxide composite coating of a magnesium alloy and a preparation method of the coating. Background technique [0002] Magnesium alloy is currently the lightest alloy material, its density is only 2 / 3 of aluminum and 1 / 4 of iron. At the same time, magnesium alloy also has many advantages such as high strength-to-mass ratio, good damping, fast heat dissipation, good dimensional stability, easy recycling, and good electromagnetic shielding ability. Magnesium alloy consumes the least energy to produce the same volume of magnesium alloy, iron and aluminum, and it is becoming the third largest metal engineering material after the latter two, enjoying the reputation of "green engineering material in the 21st century". [0003] However, the electrode potential of magnesium alloy is low, and its surface cannot form a dense protective film...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36C23C18/18
CPCC23C18/1637C23C18/1662C23C18/1834C23C18/36
Inventor 谢治辉李丹陈芳
Owner CHINA WEST NORMAL UNIVERSITY
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