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Fluorine-free phosphating process of AZ91 magnesium alloy

1. AZ91, magnesium alloy technology, applied in the direction of metal material coating process, etc., can solve serious problems, environmental pollution, harmful substances, etc., to achieve the effect of improving corrosion resistance, reducing production costs, and using less

Inactive Publication Date: 2015-04-15
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that there are many harmful substances in the phosphating waste liquid, and the pollution to the environment is quite serious.

Method used

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  • Fluorine-free phosphating process of AZ91 magnesium alloy
  • Fluorine-free phosphating process of AZ91 magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1. Alkali washing and degreasing: use an alkali washing solution to remove oil, wherein the composition of the alkali washing solution is as follows by mass ratio: 1.0% sodium hydroxide, 0.5% sodium silicate, 0.5% sodium carbonate, and 0.1% OP-10. The AZ91 magnesium alloy was dipped in the above alkali cleaning solution for 3 seconds at room temperature. Removing oil stains on magnesium alloy parts does not change the size of magnesium alloy parts, and at the same time ensures that the surface color does not turn black.

[0027] Step 2. Activation: The composition of the activation solution is: each liter of the activation solution includes 60g of sodium hydroxide, 30g of sodium citrate, 1.5g of sodium dodecylsulfonate, 10g of sodium tripolyphosphate, and the activation time is 5 minutes;

[0028] Step 3. phosphating: the composition of phosphating treatment solution is: comprise phosphoric acid 27.0g in every liter of solution, zinc oxide 7.0g, tartaric acid 1.0g,...

Embodiment 2

[0030] Step 1. Alkali washing and degreasing: use alkali washing solution to remove oil, wherein the composition of the alkali washing solution is: 2.0% sodium hydroxide, 1.0% sodium silicate, 1.0% sodium carbonate, 0.3% OP-10, using The AZ91 magnesium alloy was dipped in the above alkaline cleaning solution for 5 seconds at room temperature. Removing oil stains on magnesium alloy parts does not change the size of magnesium alloy parts, and at the same time ensures that the surface color does not change from black;

[0031] Step 2. Activation: The composition of the activation solution is: 60 g of sodium hydroxide, 30 g of sodium citrate, 2.0 g of sodium dodecylsulfonate, 10 g of sodium tripolyphosphate, and the activation time is 10 minutes per liter of activation solution ;

[0032] Step 3. Phosphating: the composition of phosphating treatment solution is: comprise phosphoric acid 27.0g, zinc oxide 7.0g, tartaric acid 3.0g, D-sodium gluconate 2.5g, sodium tetraborate 2.2g, ...

Embodiment 3

[0034] Step 1. Alkaline cleaning and degreasing: Use organic solvents to remove oil stains on the surface of AZ91 magnesium alloys, without changing the size of magnesium alloy parts, and at the same time ensuring that the surface color does not turn black;

[0035] Step 2. Activation: The composition of the activation solution is as follows: each liter of the activation solution includes 60 g of sodium hydroxide, 30 g of sodium citrate, 1.5 g of sodium dodecylsulfonate, 10 g of sodium tripolyphosphate, and the activation time is 10 minutes ;

[0036] Step 3. Phosphating: the composition of phosphating treatment solution is: comprise phosphoric acid 27.0g, zinc oxide 7.0g, tartaric acid 2.0g, D-sodium gluconate 2g, sodium tetraborate 1.0g, ammonium molybdate 1.5g in every liter of solution , sodium tungstate 0.5g, urea + A 2.0g; the preparation method of phosphating treatment solution is: first mix zinc oxide and tartaric acid, stir until the zinc oxide is dissolved, then diss...

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Abstract

A fluorine-free phosphating process of AZ91 magnesium alloy comprises three steps of oil removal by alkali washing, activation and phosphatization. The magnesium alloy phosphate solution provided by the invention is environment-friendly, an additive does not contain fluoride and nitrite and is low in amount, price of medicines is low, and cost of the solution is low. The magnesium alloy phosphate solution is treated under a normal temperature, simple in equipment, high in stability and acidic, basically has no sediments, reduces production cost, only begins to generate bubbles after being immersed in a 3.5 % NaCl solution for 10 hours, and improves corrosion resistance performance of the magnesium alloy phosphate coating.

Description

technical field [0001] The invention relates to a normal-temperature non-toxic phosphating treatment process for a magnesium alloy, in particular to a surface treatment method for an AZ91 magnesium alloy. Background technique [0002] Magnesium alloy is the lightest non-ferrous metal material among practical metals, and has a series of advantages. It has been widely used not only in aerospace, but also in the automotive industry, electronic information, and household appliances, and has broad development potential. However, the corrosion problem of magnesium alloy parts has not been well solved. There are many protection methods for magnesium alloys, among which phosphating treatment is the most widely used one, and the cost is low. [0003] Phosphating can be divided into chemical phosphating and electrochemical phosphating according to the phosphating treatment method. Electrochemical phosphating is a method of applying electric energy to electrochemical reactions effici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/42C23C22/78
Inventor 孙雅茹姚思童刘利苏晓贺
Owner SHENYANG POLYTECHNIC UNIV
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