Magnesium alloy phosphorization solution and its phosphorized technology

A magnesium alloy and solution technology, applied in the direction of metal material coating process, etc., can solve the problems of substrate corrosion and coarse phosphating film crystals, and achieve the effects of strong adhesion, low cost and easy control.

Inactive Publication Date: 2005-03-23
JILIN UNIV
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AI Technical Summary

Benefits of technology

In this new method for treating metal surfaces by applying an acidic liquid containing specific chemicals called fluoride ions or hydrofluorsulfonamides (HFSA) onto them before they undergo plasma treatment, resulting in improved protectiveness against corrodes caused by various substances like water vapor, oxygen gasoline, acids, bases, salts, solvents, lubricants, etc., which may affect their lifespan. Additionally, these methods provide better coatings than existing techniques due to its ability to achieve even greater levels of protection without adding more expensive materials compared to other processes such as electroplated nickel layers.

Problems solved by technology

This patented technical solution described by Monson etal describes how different methods have shown that adding small amounts of metals like calcium improves the performance of magnetic material such as magnesia due to their lower cost compared to other alternatives while also being less harmful towards environmental concerns. Additionally, this approach involves controlling impurities during manufacturing processes to ensure better properties.

Method used

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  • Magnesium alloy phosphorization solution and its phosphorized technology
  • Magnesium alloy phosphorization solution and its phosphorized technology

Examples

Experimental program
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Embodiment 1

[0020] Phosphating treatment of AZ91D magnesium alloy die casting samples.

[0021] Prepare the magnesium alloy phosphating solution according to the following formula:

[0022] Zinc oxide 1 g / liter aqueous solution

[0023] Phosphoric acid 10 grams per liter of aqueous solution

[0024] Accelerator Sodium Nitrate 6 grams per liter of aqueous solution

[0025] Corrosion inhibitor sodium fluoride 0.5 g / liter aqueous solution

[0026] Degrease the surface of the AZ91D magnesium alloy sample and remove the oxide film, then wash it with water, then put it into and immerse in the phosphating solution prepared above to adjust the pH value to 2.6 with phosphoric acid or sodium hydrogen fluoride, statically at 25 °C Leave on for 3 minutes, then wash and dry. The SEM photo of the phosphating film obtained by technique of the present invention is shown in the attached figure 2 .

example 2

[0028] Phosphating treatment of AZ91D magnesium alloy die casting samples.

[0029] Prepare the magnesium alloy phosphating solution according to the following formula:

[0030] Zinc oxide 3 g / liter aqueous solution

[0031] Phosphoric acid 3 grams per liter of aqueous solution

[0032] Complexing agent sodium tartrate 4 grams per liter of aqueous solution

[0033] Accelerator sodium nitrate 0.1 g / liter aqueous solution

[0034] Corrosion inhibitor sodium fluoride 4.5 grams per liter of aqueous solution

[0035] Degrease the surface of the AZ91D magnesium alloy sample and remove the oxide film, wash it with water, then put it into and immerse it in the phosphating solution prepared above to adjust the pH value to 4.5 with phosphoric acid or sodium hydrofluoride, and statically at 15 °C. Leave on for 3 minutes, then wash and dry.

example 3

[0037] Phosphating treatment of AZ91D magnesium alloy die casting samples.

[0038] Prepare the magnesium alloy phosphating solution according to the following formula:

[0039] Zinc oxide 2 grams per liter of aqueous solution

[0040] Phosphoric acid 13 grams per liter of aqueous solution

[0041] Complexing agent sodium tartrate 5 grams per liter of aqueous solution

[0042] Accelerator Sodium Nitrate 2 grams per liter of aqueous solution

[0043] Corrosion inhibitor sodium fluoride 0.5 g / liter aqueous solution

[0044] Degrease the surface of the AZ91D magnesium alloy sample and remove the oxide film, wash it with water, then put it into and immerse it in the phosphating solution prepared above to adjust the pH value to 3.1 with phosphoric acid or sodium hydrofluoride, and statically at 49 °C. Leave it on for 50 minutes, then wash and dry.

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PUM

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Abstract

The invention relates to a magnalium alloy phosphide solution and the phosphide technique. The magnalium alloy phosphide solution is composed of the following components: 1 to 4.5g of zinc oxide, 10 to 45g of phosphoric acid, 0 to 20g of tartrate, 0.1 to 6g of sodium nitrate and 0.5g to 4.5g of sodium fluoride. The process of the phosphide technique is: degrease the surface of the magnalium alloy and get rid of the film of oxygenation-> washing with water->phosphide->washing with water->drying; the temperature of the phosphide is 15 to 80deg.C and the time is 0.1 to 50 minutes. The advantages are good protection, thicker than the chromate and uniformity on the surface of the magnalium alloy. The film is stable, has strong power of adhesion and anti-corrosion, stability, easy control and low cost.

Description

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Claims

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Application Information

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Owner JILIN UNIV
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