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Surface Coating Technology of Magnesium Aluminum Alloy

A magnesium-aluminum alloy, surface coating technology, applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc., can solve the problem of low bonding strength and stability of the double-layer coating structure interface, cumbersome treatment process, loss of protective effect, etc. problems, to achieve the effect of avoiding eutrophication of water body, simplifying process flow and reducing porosity

Active Publication Date: 2021-10-22
湖北启宏热工设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the ceramic film formed by micro-arc oxidation has a microporous structure, water molecules and oxygen can penetrate into the alloy base surface through the micropores, and the corrosion resistance is limited. Therefore, sealing treatment is required, such as the application number CN201810704231.9 The patent discloses a preparation method of a micro-arc oxidation water bath sealing composite coating on the surface of magnesium / magnesium alloys, using NaOH and EDTA-2Na compound solution for sealing, such as the patent application number CN201310652041.4, which discloses a method using A method for preparing a micro-arc oxidation film layer on the surface of a magnesium alloy with an environment-friendly nickel-containing electrolyte, using a silane solution to seal holes, such as a patent with application number CN201610705799.3, which discloses a magnesium-aluminum alloy micro-arc oxidation method and electrolyte, Using sodium silicate solution or alumina sol to seal holes is not only a cumbersome process, but also the structure of alloy substrate-micro-arc oxidation inner film-sealing outer film is formed by post-treatment of sealing materials, but for this kind of The interface bonding strength and stability of the double-layer coating structure are still low. Once the sealing film layer embedded on the outside falls off, the protective effect will be lost.

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  • Surface Coating Technology of Magnesium Aluminum Alloy

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Comparison scheme
Effect test

Embodiment 1

[0024] A magnesium-aluminum alloy surface coating process, comprising the following steps:

[0025] S1: Pretreatment: Put the magnesium-aluminum alloy workpiece into the pretreatment solution, ultrasonically treat it for 4 minutes, remove the floating dust and grease, wash it twice with deionized water, dry it in vacuum and polish it until the surface is bright;

[0026] The pretreatment liquid uses water as a solvent and is composed of the following concentration components: tartaric acid 4g / L sodium polyepoxysuccinate 6g / L, sodium gluconate 8g / L, fatty alcohol polyoxyethylene ether sodium sulfate 5g / L;

[0027] S2: Micro-arc oxidation treatment: put the pretreated magnesium-aluminum alloy workpiece into the micro-arc oxidation electrolyte as the anode, and use the stainless steel plate as the cathode, set the micro-arc oxidation treatment voltage to 320V, and the current density to 15A / dm 2 , the frequency is 400Hz, the duty ratio is 25%, after micro-arc oxidation treatment ...

Embodiment 2

[0032] A magnesium-aluminum alloy surface coating process, comprising the following steps:

[0033] S1: Pretreatment: Put the magnesium-aluminum alloy workpiece into the pretreatment solution, ultrasonically treat it for 6 minutes, remove the floating dust and grease, rinse it with deionized water for 3 times, dry it in vacuum and polish it until the surface is bright;

[0034] The pretreatment liquid uses water as a solvent and consists of the following concentration components: tartaric acid 8g / L, sodium polyepoxysuccinate 10g / L, sodium gluconate 15g / L, fatty alcohol polyoxyethylene ether sodium sulfate 10g / L ;

[0035] S2: Micro-arc oxidation treatment: Put the pretreated magnesium-aluminum alloy workpiece into the micro-arc oxidation electrolyte as the anode, and use the stainless steel plate as the cathode, set the micro-arc oxidation treatment voltage to 380V, and the current density to 25A / dm 2 , the frequency is 600Hz, the duty ratio is 30%, after the micro-arc oxidat...

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Abstract

The invention discloses a magnesium-aluminum alloy surface coating process, which includes the following steps: S1: pretreatment: put the magnesium-aluminum alloy workpiece into the pretreatment solution, ultrasonically treat it for 4-6 minutes, wash, vacuum dry, and polish; S2: micro-arc Oxidation treatment: Put the workpiece into the micro-arc oxidation electrolyte, use the stainless steel plate as the cathode, and after micro-arc oxidation for 5-8 minutes, add zirconia-silica sol with a volume of 7.5-10% to the electrolyte, and mix well , continue the micro-arc oxidation treatment; the micro-arc oxidation electrolyte is composed of the following concentration components with water solvent: sodium fluoride 10-15g / L, sodium silicate 6-10g / L, polyepoxysodium sodium succinate 3 ~5g / L, sodium hydroxide 3~5g / L; S3: Surface hydrophobic treatment: Coating polytrifluoropropylmethylsiloxane on the surface of the workpiece, curing and heat treatment. In the present invention, zirconia-silica sol is mixed into the micro-arc oxidation electrolyte, and the micro-arc oxidation treatment and hole sealing treatment are realized in one step, which not only greatly improves the structural stability of the ceramic membrane, but also reduces its porosity.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy surface treatment, and in particular relates to a magnesium-aluminum alloy surface coating process. Background technique [0002] Magnesium-aluminum alloy is an alloy based on magnesium and added with aluminum elements. It has low density, high strength, good rigidity, large elastic modulus, good heat dissipation, good shock absorption, high impact load capacity, electromagnetic shielding, and radiation protection. , Good process performance and other advantages, are widely used in aviation, aerospace, transportation, chemical industry, rockets, missiles, new energy vehicles, electronic products and other industrial fields. Compared with other alloys, magnesium-aluminum alloy has the highest relative strength, significantly higher than aluminum alloy and steel. Under the same load, the shock absorption is 100 times that of aluminum alloy and 300-500 times that of titanium alloy. High chem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30C23G1/12
CPCC23G1/12C25D11/026C25D11/30
Inventor 沈文齐王文爽
Owner 湖北启宏热工设备有限公司