阅读说明：本技术 一种镁合金表面复合膜及其制备方法 (A kind of magnesium alloy surface composite film and preparation method thereof ) 是由 蒋永锋 包晔峰 陈秉岩 杨可 于 2019-10-12 设计创作，主要内容包括：本发明公开了一种镁合金表面复合膜制备方法,属于表面处理技术领域,包括以下步骤：制备氧化电解液；将镁合金与所述氧化电解液在电压幅值为500~800V的纳秒脉冲下进行反应；所述氧化电解液包括：偏铝酸盐或磷酸盐、强碱、纳米氧化钇粉末和纳米碳化硅粉末。本发明提供的复合膜的制备方法,制备过程更加环保,且工艺简单成本低。本发明还提供了一种镁合金表面复合膜,采用上述方法制得,可耐磨防腐蚀。(The invention discloses a kind of magnesium alloy surface composite film preparation methods, belong to technical field of surface, comprising the following steps: prepare oxidation electrolyte；Magnesium alloy is reacted with the oxidation electrolyte in the case where voltage magnitude is the nanosecond pulse of 500 ~ 800V；The oxidation electrolyte includes: meta-aluminate or phosphate, highly basic, nano yttrium oxide powder and Neon SiC powder.The preparation method of composite membrane provided by the invention, preparation process is more environmentally-friendly, and simple process is at low cost.The present invention also provides a kind of magnesium alloy surface composite films, are made using the above method, can wear-resistance and anti-corrosion.)

1. a kind of preparation method of magnesium alloy surface composite film, which comprises the following steps: prepare oxidation electrolyte；

Magnesium alloy is reacted with the oxidation electrolyte in the case where voltage magnitude is the nanosecond pulse of 500 ~ 800V；

The oxidation electrolyte includes: meta-aluminate or phosphate, highly basic, nano yttrium oxide powder and Neon SiC powder.

2. the preparation method of magnesium alloy surface composite film according to claim 1, it is characterised in that: the meta-aluminate is six Sodium metaphosphate, the phosphate are sodium aluminate, and the weight of calgon or sodium aluminate is 47 ~ 57 parts.

3. the preparation method of magnesium alloy surface composite film according to claim 1, it is characterised in that: the highly basic is hydroxide Sodium or potassium hydroxide, weight are 20 ~ 30 parts.

4. the preparation method of magnesium alloy surface composite film according to claim 1, it is characterised in that: the yttria nanopowders Last weight is 1 part, and the Neon SiC powder weight is 1 part.

5. the preparation method of magnesium alloy surface composite film according to claim 1, it is characterised in that: the oxidation electrolyte is also It is 20 ~ 30 parts including glycerine or triethanolamine weight.

6. the preparation method of magnesium alloy surface composite film according to claim 1, it is characterised in that: described to prepare oxidization electrolysis Liquid the following steps are included:

It will be in nano yttrium oxide powder and Neon SiC powder merging hydrofluoric acid solution；It is activated 1-3 minutes with ultrasonic disperse；So Dispersing agent is added afterwards to continue to disperse to activate 1-3 minutes to obtain nano yttrium oxide and nanometer silicon carbide solution；It is first added in a reservoir Meta-aluminate or phosphate, add highly basic, and scattered nano yttrium oxide and nanometer silicon carbide solution is finally taken to be added to obtain Oxidation electrolyte.

7. the preparation method of magnesium alloy surface composite film according to claim 6, it is characterised in that: the dispersing agent is tetramethyl Base ammonium hydroxide, weight are 1 part.

8. the preparation method of magnesium alloy surface composite film according to claim 1, it is characterised in that: the arteries and veins of the nanosecond pulse Width is 10 ~ 100ns.

9. the preparation method of magnesium alloy surface composite film according to claim 1, it is characterised in that: the nanosecond pulse is put The electric time is 1 ~ 2 min.

10. a kind of magnesium alloy surface composite film wants 1 to 9 any one method to be made using right.

Technical field

The present invention relates to a kind of magnesium alloy surface composite films and preparation method thereof, belong to technical field of surface.

Background technique

Magnesium alloy has the features such as specific strength, specific stiffness are high, and high damping vibration attenuation is good.However magnesium alloy is because of its intrinsic change Learning property causes to easily corrode, and anti-corrosion just becomes the important topic of its surface treatment.

The preparation method (Chinese Patent Application No.: CN201510749871.8) of existing magnesium alloy surface composite film, first Magnesium alloy is subjected to chemical plating in containing nickel plating bath, then carries out electricity in containing cerous nitrate and stearic sewage electric depositing solution and sinks Product reaction, although this method has obtained a kind of super-hydrophobic composite film, but due to wherein having used heavy metal solution, make At the pollution of environment.

The preparation method (Chinese Patent Application No.: CN201610178062.0) of existing magnesium alloy surface composite film is right Mg alloy surface carries out differential arc oxidation and organic film plating, but such method yield rate is low, at high cost, easily leads to the precision of workpiece It reduces.

Summary of the invention

The present invention is to provide a kind of preparation method of magnesium alloy surface composite film, and preparation process is more environmentally-friendly, and technique letter It is single at low cost.

In order to achieve the above objectives, the technical scheme adopted by the invention is that:

A kind of preparation method of magnesium alloy surface composite film, comprising the following steps: prepare oxidation electrolyte；By magnesium alloy with it is described Oxidation electrolyte is reacted in the case where voltage magnitude is the nanosecond pulse of 500 ~ 800V；The oxidation electrolyte includes: meta-aluminic acid Salt or phosphate, highly basic, nano yttrium oxide powder and Neon SiC powder.

Further, the meta-aluminate or phosphate are calgon or sodium aluminate, and weight is 47 ~ 57 parts.

Further, the highly basic is sodium hydroxide or potassium hydroxide, and weight is 20 ~ 30 parts.

Further, the nano yttrium oxide powder weight is 1 part, and the Neon SiC powder weight is 1 part.

Further, the oxidation electrolyte further includes glycerine or triethanolamine weight is 20 ~ 30 parts.

Further, described to prepare oxidation electrolyte the following steps are included: by nano yttrium oxide powder and nanometer silicon carbide Powder is placed in hydrofluoric acid solution；It is activated 1-3 minutes with ultrasonic disperse；Then dispersing agent is added and continues dispersion activation 1-3 minutes Obtain nano yttrium oxide and nanometer silicon carbide solution；Meta-aluminate or phosphate are first added in a reservoir, adds highly basic, finally Scattered nano yttrium oxide and nanometer silicon carbide solution is taken to be added to obtain oxidation electrolyte.

Further, the dispersing agent is tetramethylammonium hydroxide, and weight is 1 part.

Further, the pulsewidth of the nanosecond pulse is 10 ~ 100ns.

Further, the discharge time of the nanosecond pulse is 1 ~ 2 min.

A kind of preparation method of magnesium alloy surface composite film provided by the invention, the processing of all material is in normal temperature condition Lower progress, thus the speed that composite membrane is made is fast, the time is short, simplifies treatment process, reduces costs well.This method Oxidation electrolyte is free of heavy metal, thus the influence to environment is small.

Nano yttrium oxide powder and Neon SiC powder are added in oxidation electrolyte, polarized electronegative ion is logical Plasma electrochemical reaction is crossed, point discharge position is adsorbed in, by the hole of plasma high-temperature sintering filling and film layer And by sintering, the porosity of film layer is reduced, the anticorrosion wear-resisting property of film layer is improved.

The present invention also provides a kind of magnesium alloy surface composite films, can wear-resistance and anti-corrosion.

In order to achieve the above objectives, the technical scheme adopted by the invention is that: a kind of magnesium alloy surface composite film, use are above-mentioned Method is made.

The treatment fluid is more stable in oxidation processes, almost without deposition, realizes nano particle at oxidation Being uniformly distributed during reason.The composite membrane realizes the Even Sintering of nano particle, compound process, solves magnesium alloy table Corrosion resistance caused by surface oxidation film voidage is excessively high and wear resistance decrease problem, improve wearability and corrosion resistance.

Specific embodiment

Essence in order to better understand the present invention, the invention will be further elaborated combined with specific embodiments below. Part below is poidometer.