Process Characteristics Flow Of Micro-Arc Oxidation Of Magnesium-Aluminum Alloys Magnesium Alloy Parts

Micro-Arc Anodizing Is Also Known As Micro-Arc Plasma Oxidation Anode Spark Deposition, Collectively Known As Micro-Arc Oxidation. It Is A Commonly Used Post-Treatment In The Machining Of Magnesium Alloys . Plasma Micro-Arc Discharge Is Generated In The Anode Area Using AC DC Power, The Instantaneous High-Temperature Sintering Directly Forms A Ceramic Film In Situ On The Surface Of The Magnesium Alloy . The Temperature In The Micro-Arc Zone Can Reach Above 1000°C, So That The Anodic Oxide Is Dissolved On The Surface Of The Metal Magnesium Alloy. This Ceramic Film Greatly Improves The Hardness Density Of The Anodic Oxide Film. The Film Thickness Can Be Adjusted Between About 5 70μm. It Can Be Guaranteed That After 500h In Neutral Salt Spray, The Coating Adhesion Reaches Level 0 The Microhardness Is About 400HV. However, Further Coating Protection Is Still Required After Micro-Arc Oxidation. Now, Huiwen Will Explain To You The Process Characteristics Process Of Micro-Arc Oxidation Of Magnesium-Aluminum Alloys  Magnesium Alloy Parts .

Characteristics Of Micro-Arc Oxidation Process For Machining Magnesium Alloys :

① The Surface Hardness Of The Material Can Be Greatly Enhanced Under Micro-Arc Technology, With A Microhardness Of 1000 To 2000 HV, Up To 3000 HV, Which Is Comparable To Cemented Carbide Greatly Exceeds The Hardness Of High-Carbon Steel, High-Alloy Steel High-Speed Tool Steel After Heat Treatment;

② After Micro-Arc Oxidation, CNC Machined Parts Are More Wear-Resistant;

③After Micro-Arc Oxidation, Magnesium Alloy Parts Have Better Heat Resistance Corrosion Resistance;

④Good Insulation Performance, Insulation Resistance Can Reach 100MΩ

⑤The Environment Is Good, The Solution Is Environmentally Friendly Meets Environmental Emission Requirements;

⑥A Uniform Film Layer Can Be Formed On Workpieces With Complex Shapes Restricted Channels;

⑦The Process Is Stable Reliable, The Equipment Is Simple;

⑧The Reaction Is Carried Out At Room Temperature, Which Is Convenient To Operate Easy To Master;

⑨ The Ceramic Membrane Grows In Situ On The Substrate, The Bonding Is Firm, The Ceramic Membrane Is Dense Uniform;

⑩Size Becomes Smaller;

In Addition, Ion Implantation Technology, Laser Surface Treatment Technology Nitriding Technology Are Used To Modify The Surface Of Magnesium Alloys In Order To Improve The Wear Corrosion Resistance Of The Magnesium Alloy Surface.

Process Flow Of Micro-Arc Oxidation Process For Machining Magnesium Alloy:

① Pretreatment Of Micro-Arc Oxidation The Reason For Pretreatment Is That Aluminum, Iron Other Alloys Are Placed In The Air For A Long Time, The Surface Is Prone To Oxidation, Forming A Passivation Film Of Several Microns. At The Same Time, Its Surface Is Very Easy To Adsorb Impurities In The Surrounding Environment To Form A Surface Adsorption Layer. In Order To Ensure The Comprehensive Mechanical Properties Of The Ceramic Film Obtained After Micro-Arc Oxidation, The Surface Of The Sample Must Be Pretreated Before Micro-Arc Oxidation Treatment.

② Micro-Arc Oxidation Process During The Micro-Arc Oxidation Process, The Sample To Be Oxidized Is Connected To The Positive Pole Of The Power Supply Immersed In The Electrolyte As The Anode. The Stainless Steel Electrolytic Cell Is Connected To The Negative Pole Of The Power Supply As The Cathode. After The Power Is Turned On, The Positive Pulse Voltage Rises Rapidly The Current Drops Rapidly. The Sample To Be Oxidized As The Anode Begins To Be Anodic Oxidized, Generating A Large Number Of Tiny Bubbles, At The Same Time Forming An Extremely Thin Passivation Film On The Surface Of The Sample. When The Applied Pulse Voltage Exceeds A Certain Value, An Extremely Fine Uniform Discharge Spark Appears On The Surface Of The Material. This Micro-Area Spark Discharge Phenomenon Appears At Different Positions On The Surface Of The Sample, Finally A Ceramic Film Layer Is Grown In Situ On The Surface Of The Alloy To Be Oxidized To Achieve The Purpose Of Strengthening The Surface Of The Material.

Membrane Performance Testing Instrument The Performance Test Of The Membrane Layer Includes Three Parts: Thickness Characterization, Hardness Characterization, Morphology Characterization, Phase Composition Characterization Surface Roughness Characterization. The Thickness Of The Oxide Ceramic Film Is Tested By A Delft Flow Thickness Gauge; The Microhardness Of The Membrane Surface Is Measured By A Microhardness Tester; The Surface, Cross-Sectional Morphology Microstructure Of The Micro-Arc Oxidation Ceramic Film Are Observed By An Environmental Scanning Electron Microscope.

Huiwen Intelligent Manufacturing Co., Ltd. Is A Comprehensive High-Tech Enterpriserelying On The Technical Background Of The Chinese Academy Of Sciences, Focusing On The Design Optimization, Production Manufacturing Of Intelligent Robot Parts , Domestic Foreign Sales. The Company Team Was Established In 2010 Has Long Been Committed To The Processing Of High-Precision, High-Difficulty, Easy-To-Deform Metal Plastic Parts , Small Medium-Volume Production Manufacturing Of Light Alloy Composite Materials (Such As Magnesium Alloy, Magnesium-Aluminum Alloy, Carbon Fiber, Etc.),  Robot Parts Procurement Customization Services.