Here are some methods to improve the quality and performance of oxide films:

Optimize Alloy Composition

 

Increase the Content of Beneficial Alloy Elements: Appropriately increase the content of alloy elements that can form high-quality oxide films, such as chromium and aluminum. For example, in stainless steel, when the chromium content reaches a certain proportion (such as 18% - 20% or higher), the formed chromium oxide film will be denser and more continuous, which can effectively resist more types of corrosive media. For aluminum alloys, increasing the aluminum content can make the generated alumina film thicker and more complete, thereby enhancing its protective performance.

Add Trace Elements for Modification: Adding trace elements such as rare earth elements (cerium, lanthanum, etc.) can improve the performance of oxide films. These trace elements can refine the grain structure of oxide films, making the oxide films more uniform and dense. For example, after adding rare earth elements to some aluminum alloys, the porosity of the oxide films is reduced, and their corrosion resistance is significantly improved. Rare earth elements can play a role in pinning grain boundaries during the growth of oxide films, inhibiting grain growth and thus improving the quality of oxide films.

Control the Oxidation Environment

 

Control Oxygen Concentration and Pressure: During the formation of oxide films, appropriate oxygen concentration and pressure are key factors. Higher oxygen concentration and pressure are helpful for forming thicker and better-quality oxide films. For example, in some high-temperature oxidation environments, by controlling the partial pressure of oxygen, the oxidation reaction on the alloy surface can be made more sufficient, and the generated oxide films will be denser. However, overly high oxygen pressure may cause the oxide films to grow too fast and generate stress, leading to cracking of the oxide films. Therefore, optimization and adjustment need to be carried out according to the specific alloy materials and process requirements.

 

Adopt Appropriate Surface Pretreatment

 

Mechanical Pretreatment: Methods such as mechanical grinding and polishing can make the surface of alloy steel plates flatter and smoother. In this way, during the formation of oxide films, the impact of surface defects on the quality of oxide films can be reduced. For example, after fine grinding of alloy steel plates, the surface roughness is reduced, and the generated oxide films are more uniform, and their corrosion resistance and wear resistance can be improved.

Chemical Pretreatment: Chemical cleaning, pickling and other methods are adopted to remove oil stains, oxide scales and impurities on the surface of alloy steel plates. For example, cleaning alloy steel plates with an acidic solution can dissolve rust and other impurities on the surface, making the alloy surface in a clean state and providing a good foundation for the uniform growth of oxide films. Meanwhile, chemical conversion treatments such as phosphating and chromating can also be carried out to form a conversion film on the alloy surface. This conversion film can serve as the bottom layer for the subsequent growth of oxide films, which is beneficial to improving the adhesion and quality of oxide films.

 

 

 

 

Commodity: Lr ABS Ah36 Shipbuilding Steel Marine Plate

Thickness: 2-200mm

Length: 2000mm-11800mm

 

 

Apply Advanced Oxidation Processes

 

Anodizing Process: For aluminum alloys and other materials, anodizing is a commonly used method. During the anodizing process, the alloy serves as the anode, and an oxide film is formed through electrolysis in the electrolyte. By adjusting the components of the electrolyte (such as sulfuric acid, oxalic acid, etc.), current density, oxidation time and other parameters, the thickness, porosity and hardness of the oxide film can be controlled. For example, in the sulfuric acid anodizing process, appropriately increasing the current density and oxidation time can increase the thickness of the oxide film. Meanwhile, through subsequent sealing treatment, the porosity of the oxide film can be reduced, and its corrosion resistance can be improved.

Optimization of Thermal Oxidation Process: During the high-temperature oxidation process, it is crucial to precisely control the heating rate, oxidation time and cooling rate and other parameters. For example, adopting a slow heating rate can make the elements inside the alloy diffuse more evenly to the surface to participate in the oxidation reaction, and the generated oxide films will have better quality. Meanwhile, during the cooling process after oxidation, reasonably controlling the cooling rate can avoid cracking of the oxide films caused by thermal stress. The oxide films prepared through the thermal oxidation process usually have better stability and protective performance in high-temperature environments.

 

 

 

 

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