Micro Arc Oxidation (MAO / PEO)

Core Manufacturing Technologies & Services

LEEDO Technology provides micro arc oxidation (MAO / PEO) surface treatment services. Through a high-voltage plasma discharge process, an integrated ceramic oxide layer is formed in situ on the metal surface, offering high hardness, excellent electrical insulation, and outstanding corrosion resistance for high-performance applications such as aerospace, semiconductors, and electric vehicles.

Main Categories & Technical Specifications
Uses plasma micro-arc discharge to grow a ceramic layer in situ on the metal surface. The layer is fully bonded with the substrate and does not peel easily.
Ceramic Surface Treatment
The oxide layer features a ceramic microstructure with hardness reaching approximately Vickers 600–1000 HV, far exceeding standard anodizing.
High-Insulation Ceramic Oxide Layer
The ceramic layer provides excellent electrical insulation, making it suitable for high-power electronic modules and thermal structural components.
High Wear and Corrosion Protection
The ceramic oxide layer provides excellent wear resistance, corrosion resistance, and high-temperature performance for high-load and harsh industrial environments.
Lightweight Functional Surface Engineering
While maintaining the lightweight advantages of aluminum and magnesium alloys, MAO greatly improves surface hardness, insulation, and durability.

Main Categories & Technical Specifications

LEEDO Technology provides a range of micro arc oxidation (MAO / PEO) solutions for aluminum and magnesium alloys. Coating thickness can reach 5–100μm, with ceramic oxide layer properties precisely adjusted according to application requirements for insulation, wear resistance, corrosion resistance, and thermal stability.

Micro Arc Oxidation for Aluminum and Magnesium Alloys
Optimized process parameters for aluminum alloys such as 5052, 6061, 6063, and 7075, as well as magnesium alloys such as AZ31, AZ61, and AZ91, forming a dense and uniform ceramic oxide layer.
Ceramic Surface Reinforcement
The oxide layer has a ceramic microstructure that significantly improves surface hardness, wear resistance, and high-temperature performance.
High-Insulation Ceramic Layer
Provides excellent electrical insulation for electronic modules, battery systems, motors, power equipment, and high-power applications.
High-Hardness Oxide Film
Hardness can reach approximately 600–1000 HV, depending on material and process conditions, making it suitable for high-wear and high-load industrial environments.
Adjustable Coating Thickness Design
Provides a coating thickness range of 5–100μm, allowing customized planning based on insulation requirements, wear resistance needs, and dimensional tolerance requirements.

Material Compatibility

Micro arc oxidation is suitable for a wide range of lightweight metals, including aluminum alloys, magnesium alloys, and titanium alloys. Each material can form a dense ceramic oxide layer.

Aluminum Alloys 5052 / 6061 / 6063 / 7075
Various structural aluminum alloys can be treated, with MAO greatly improving surface hardness and corrosion resistance.
Cast Aluminum Parts
Supports die-cast and sand-cast aluminum parts, with the ceramic layer uniformly covering complex geometries.
AZ31 / AZ91 Magnesium Alloys
Magnesium alloys have relatively weak corrosion resistance by nature. The MAO ceramic layer provides critical long-term protection.
Grade 2 Pure Titanium
Suitable for pure titanium used in biomedical and chemical applications. MAO treatment can further improve biocompatibility and corrosion resistance.
Grade 5 Titanium Alloy (Ti-6Al-4V)
A mainstream high-strength titanium alloy for aerospace applications. MAO provides additional wear resistance and thermal insulation protection.

Surface Finish & Appearance Options

MAO ceramic layers are primarily functional and are available in white, gray, and black appearances, making them suitable for high-performance industrial applications.

Micro Arc Oxidation Surface Finish and Appearance Options
  • White Ceramic Layer
    A typical MAO appearance with uniform surface micropores, suitable for electronic equipment components requiring high electrical insulation.
  • Gray Ceramic Layer
    An industrial gray appearance suitable for automation equipment and structural parts used in semiconductor process equipment.
  • Black MAO
    A dark ceramic layer combining aesthetics and high hardness, suitable for high-end industrial and consumer product applications.
  • High-Insulation Coating
    Special formulations optimize electrical insulation for high-power electronic modules and power equipment.
  • High-Insulation Ceramic Layer
    The ceramic oxide layer provides excellent electrical insulation for high-power electronic modules, battery systems, motors, and power equipment.
  • Coating Thickness 5–100μm
    Coating thickness can be specified according to insulation level or wear resistance requirements, offering high design flexibility.

Design & Manufacturing Considerations

MAO process parameters significantly affect the final ceramic layer properties. The following factors should be evaluated during the early design stage to ensure that process specifications meet application requirements.

Micro Arc Oxidation Design and Manufacturing Considerations
  • Insulation Performance Requirement Evaluation
    Plan ceramic layer thickness and formulation according to voltage level and insulation specifications.
  • Thermal Management Requirement Analysis
    Evaluate the influence of the ceramic layer on heat dissipation paths to ensure that thermal resistance meets system design requirements.
  • Ceramic Layer Thickness Planning
    Coating thickness affects insulation, wear resistance, and dimensions, so corresponding tolerances should be reserved during the design stage.
  • High-Hardness Surface Design
    Select the most suitable MAO process formulation according to wear conditions and stress requirements.
  • Lightweight Structural Design
    MAO does not significantly increase substrate weight, making it suitable for weight-sensitive applications such as aerospace and electric vehicles.
  • Integration of Corrosion and Wear Resistance Requirements
    Corrosion resistance and wear resistance can be optimized simultaneously according to the application environment, reducing the need for secondary treatment.

Industrial Applications

Micro arc oxidation is suitable for precision industries with high requirements for electrical insulation, wear resistance, and corrosion resistance at the same time.

AI Infrastructure and Power Modules
The ceramic layer combines electrical insulation, high hardness, and corrosion resistance, making it suitable for high-power electronic equipment, power modules, and related structural components.
Electric Vehicle Components
Battery module housings and motor structural components require corrosion resistance and electrical insulation. MAO provides composite surface protection.
Aerospace Equipment
Lightweight aluminum, magnesium, and titanium alloy components combined with MAO provide reliable protection in harsh environments.
Semiconductor and Precision Equipment
Suitable for equipment structures, carriers, and precision mechanical parts, providing excellent insulation, wear resistance, and corrosion resistance.
Optical and Optical Communication Equipment
Precision optical structural components require stable dimensions and surface properties. MAO provides reliable protection.
High-Power Electronic Modules
Suitable for composite functional requirements that must satisfy heat dissipation, electrical insulation, and wear resistance at the same time.