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Principle of hard anodizing
Hard anodizing uses electric current. It makes an oxidation reaction on the metal surface. Then a dense oxide film is made. This process is like “sunbathing” the metal. But it uses electric current instead of sunlight. By controlling the current, electrolyte composition, temperature, and other conditions, we can control the thickness and hardness of the oxide film accurately.
Advantages of hard anodizing
Super wear resistance: The hard oxide film can be as hard as or even harder than some cemented carbides. It makes the metal surface much more wear-resistant.
Corrosion resistance: The oxide film can separate the metal from the outside. It stops the metal from corroding.
Good insulation: The oxide film has good insulation. It can protect the internal circuit.
Good heat resistance: The oxide film can handle high heat. It stays stable in high-temperature places.
Beautiful: The oxide film can show different colors. It makes the product look better.
Application of hard anodizing
Hard anodizing is used in many fields
Aerospace: It makes aircraft parts more wear-resistant and corrosion-resistant. This keeps flights safe.
Automobile manufacturing: It makes engine parts more wear-resistant. It makes the engine last longer.
Electronic equipment: It makes electronic components more wear-resistant and gives them better insulation.
Mechanical manufacturing: It makes tools like molds and cutters last longer.
Limitations of hard anodizing
Hard anodizing has many advantages. But it also has some problems. For example:
High cost: Hard anodizing costs more than old-fashioned surface treatments.
High equipment needs: Special equipment and processes are needed.
Tough for complex shapes: For workpieces with complex shapes, it’s hard to make the oxide film the same all over.
Conclusion
Hard anodizing is a process. It forms a hard oxide film on the metal surface. It has big advantages. It makes the material more wear-resistant, corrosion-resistant, and insulating. You can also change the thickness of the oxide film. It’s used a lot in aerospace, car-making, and other areas. The cost is kind of high. But it gives products great performance. It helps different industries grow.
