Magnesium alloy surface zinc-calcium series phosphating solution and conversion treatment process thereof

A magnesium alloy and solution technology, which is applied in the field of zinc-calcium phosphating solution and its conversion treatment process on the surface of magnesium alloy, can solve the problems of high cost, weak adhesion of protective film, and difficult operation, and achieve low cost and protection Good performance, simple operation and easy control

Inactive Publication Date: 2010-03-17
CHONGQING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned solutions for treating the surface of magnesium alloys have disadvantages such as weak adhesion of

Method used

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  • Magnesium alloy surface zinc-calcium series phosphating solution and conversion treatment process thereof
  • Magnesium alloy surface zinc-calcium series phosphating solution and conversion treatment process thereof

Examples

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Example Embodiment

[0027] Example 1: Each liter of aqueous solution contains 15 grams of disodium hydrogen phosphate, 4 grams of zinc nitrate, 2 grams of sodium nitrite, 0.5 grams of sodium fluoride, and 0.5 grams of calcium nitrate; the pH of the phosphating solution is 2, using phosphoric acid And / or sodium hydroxide to adjust the pH.

[0028] The surface of the magnesium alloy sample is degreased and the oxide scale is removed (surface activation treatment), then washed with water, and then immersed in the above-prepared phosphating solution adjusted to pH 2.5 with phosphoric acid and / or sodium hydroxide at 50°C Let stand for 20 minutes, then wash and dry. The film layer obtained by the present invention is black, and the corrosion current density of the conversion film layer obtained on the surface of the extruded AZ31 in 3.5% NaCl solution is 23 μA / cm 2 about. The SEM photo of the phosphating film obtained in this example is attached figure 1 And the composition analysis of the film is attach...

Example Embodiment

[0030] Example 2: Each liter of aqueous solution contains 20 grams of disodium hydrogen phosphate, 5 grams of zinc nitrate, 3 grams of sodium nitrite, 1 gram of sodium fluoride, and 1 gram of calcium nitrate; the pH value of the phosphating solution is 2.5.

Example Embodiment

[0031] Example 3: Each liter of aqueous solution contains 30 grams of disodium hydrogen phosphate, 6 grams of zinc nitrate, 4 grams of sodium nitrite, 2 grams of sodium fluoride, and 2 grams of calcium nitrate; the pH of the phosphating solution is 3.

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Abstract

The invention discloses magnesium alloy surface zinc-calcium series phosphating solution and a conversion treatment process thereof; the magnesium alloy surface phosphating solution is aqueous solution formed by the following constituents, namely, every liter solution contains: 10-30g of disodium hydrogen phosphate, 4-6g of zinc nitrate, 2-4g of sodium nitrite, s0.5-2g of sodium fluoride, and 0.-2g of calcium nitrate; the process for carrying out surface conversion treatment to the phosphating solution comprises the following process flows: alkaline washing and degreasing->rinsing->acidity activation->rinsing->surface activation->rinsing->phosphating->rinsing->drying; the working temperature is 40-70 DEG C, and the time is 5-60 minutes. The conversion treatment process can obtain phosphateconversion coating on the surface of the magnesium alloy, wherein the conversion coating has good protectiveness, is fine and uniform and stable, and has strong adhesive force, and can improve the corrosion-resisting property of magnesium alloy parts; the conversion treatment process is stable and easy to control, and has low cost.

Description

Technical field [0001] The invention relates to a magnesium alloy surface anticorrosive treatment technology, in particular to a magnesium alloy surface zinc-calcium phosphating solution and its conversion treatment technology. Background technique [0002] Magnesium alloy is one of the lightest engineering structural metal materials. It has the characteristics of low density, high specific strength, good electrical conductivity and electromagnetic shielding performance, good vibration reduction and damping performance, and easy recycling. Magnesium alloys can be used in fields such as automobiles, aerospace, and 3C products (household appliances, computers, and communication electronics). However, the electrode potential of magnesium is very low (-2.37V), the chemical properties are active, and the corrosion resistance is poor. It usually needs to undergo a chemical conversion treatment to form a protective film on its surface before it can be used. [0003] The chromate conversi...

Claims

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Application Information

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IPC IPC(8): C23C22/36
Inventor 曾荣昌兰自栋
Owner CHONGQING UNIV OF TECH
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