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Preparation method of epoxy coating for improving stress resistance and corrosion performance of magnesium alloy

A magnesium alloy, stress-resistant technology, applied in coatings, devices for coating liquid on surfaces, special surfaces, etc., can solve problems such as the inability to effectively protect magnesium alloys from stress corrosion, limited component geometry, and complex equipment. To achieve the effect of improving the protection effect, low cost and convenient operation

Active Publication Date: 2018-06-22
TAIYUAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, surface treatment methods such as vapor deposition, laser shock treatment, plasma electrolytic oxidation, electroplating, and chemical plating cannot effectively protect the stress corrosion performance of magnesium alloys, and there are complex equipment, expensive equipment, or limited component geometry. shortcoming

Method used

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  • Preparation method of epoxy coating for improving stress resistance and corrosion performance of magnesium alloy
  • Preparation method of epoxy coating for improving stress resistance and corrosion performance of magnesium alloy
  • Preparation method of epoxy coating for improving stress resistance and corrosion performance of magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Prepare the pickling and activation treatment solution according to the following formula, containing 5g of phosphoric acid and 1g of sulfuric acid per liter of water.

[0022] Alkali washing lotion is configured according to the following formula, and each liter of water contains: 3g sodium hydroxide, 1.5g sodium silicate, 0.5g sodium dodecylbenzenesulfonate.

[0023] The epoxy coating was prepared according to the following recipe, containing per liter of water: 45g epoxy resin, 3g diethylenetriamine and 2g acetone.

[0024] The preparation method of the epoxy coating for improving the stress corrosion resistance of the magnesium alloy is as follows: sandpaper grinding on the surface of the magnesium alloy; ultrasonic cleaning; alkali cleaning; deionized water rinsing; drying; pickling activation; deionized water rinsing; drying; coating preparation; Curing and drying; specifically: firstly polish the magnesium alloy, then put the magnesium alloy into a beaker of abso...

Embodiment 2

[0026] Configure the pickling and activation treatment solution according to the following formula, containing 7g of phosphoric acid and 2g of sulfuric acid per liter of water.

[0027] Alkali washing lotion is configured according to the following formula, and each liter of water contains: 4g sodium hydroxide, 2g sodium silicate, 0.5g sodium dodecylbenzenesulfonate.

[0028] The epoxy coating was prepared according to the following recipe, containing per liter of water: 55g epoxy resin, 5g diethylenetriamine and 4g acetone.

[0029] The preparation method of the epoxy coating for improving the stress corrosion resistance of the magnesium alloy is as follows: sandpaper grinding on the surface of the magnesium alloy; ultrasonic cleaning; alkali cleaning; deionized water rinsing; drying; pickling activation; deionized water rinsing; drying; coating preparation; Curing and drying; specifically: firstly polish the magnesium alloy, then put the magnesium alloy into a beaker of abso...

Embodiment 3

[0031] Configure the pickling and activation treatment solution according to the following formula, and each liter of water contains: 6g of phosphoric acid and 1.5g of sulfuric acid.

[0032] Alkali washing lotion is configured according to the following formula, containing in every liter of water: 3.5g sodium hydroxide, 2g sodium silicate, 1.5g sodium dodecylbenzenesulfonate.

[0033] The epoxy coating was prepared according to the following recipe, containing per liter of water: 50g epoxy resin, 4g diethylenetriamine and 3g acetone.

[0034] The preparation method of the epoxy coating for improving the stress corrosion resistance of the magnesium alloy is as follows: sandpaper grinding on the surface of the magnesium alloy; ultrasonic cleaning; alkali cleaning; deionized water rinsing; drying; pickling activation; deionized water rinsing; drying; coating preparation; Curing and drying; specifically: firstly polish the magnesium alloy, then put the magnesium alloy into a beak...

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Abstract

The invention discloses a preparation method of an epoxy coating for improving stress resistance and corrosion performance of magnesium alloy, and belongs to the technical field of metal surface protection and application. The preparation method includes the steps that the surface of the magnesium alloy is activated through acid pickling, an activate fluid comprises, by weight, 5-7% of phosphoricacid and 1-2% of sulfuric acid, and the activated time is 15-20s; a coating comprises, by weight, 45-55% of epoxy resins, 3-5% of diethylene triamine and 2-4% of acetone; and magnesium alloy materialswhich are activated through acid pickling are completely immersed in the coating for 8-12s and taken out. According to the preparation method of the epoxy coating for improving the stress resistanceand the corrosion performance of the magnesium alloy, the surface of the magnesium alloy is subjected to acid pickling to form a roughness of R=16[mu]m on the surface of the magnesium alloy materials, and the surface of the magnesium alloy is firmly coated with the epoxy coating by restricting ingredients and coating time of the epoxy coating. The stress resistance and the corrosion performanceof the magnesium alloy are improved thorough the preparation of the epoxy coating, and an efficient protecting method of usage of the magnesium alloy materials under the environmental conditions of certain loading and corrosion is provided.

Description

technical field [0001] The invention relates to the technical field of metal surface protection and application, in particular to a method for preparing an epoxy coating for improving the stress corrosion resistance of magnesium alloys. Background technique [0002] Stress corrosion cracking is a low-stress failure mode, which is very harmful, and engineering structural parts often break suddenly, resulting in catastrophic accidents. Metal magnesium and magnesium alloys have active chemical properties, poor corrosion resistance, and complex engineering service environments. Therefore, the preparation of effective stress corrosion protection coatings on the surface of magnesium alloys has become the key to its safe and reliable wide application in the field of engineering structures in the future. [0003] It is well known that epoxy resin has excellent corrosion resistance. However, the stress corrosion performance of materials is not a simple superposition of stress and c...

Claims

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Application Information

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IPC IPC(8): B05D7/14B05D7/24B05D5/00B05D3/10C23G1/12
CPCB05D3/102B05D5/00B05D7/14B05D7/24B05D2202/20B05D2504/00C23G1/12
Inventor 贺秀丽梁红玉白瑞翟燕梁淑君
Owner TAIYUAN INST OF TECH