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Black oxide treatment typically only generates an extremely thin oxide film on the metal surface, so its ability to affect dimensional accuracy is very limited.
– Pickling: Metal parts are immersed in an acidic solution to clean the surface and remove oxides and contaminants. This process is to making sure the surface cleanliness to prepare for further processes.
– Alkaline Cleaning: After pickling, parts are cleaned and neutralized with an alkaline cleaner to ensure no harmful residues remain.
– Black Oxidizing: Cleaned parts are immersed in a black oxide solution that typically contains sodium hydroxide and other compounds, forming a black oxide film.
– Sealing: Optionally, parts are immersed in a sealant to increase corrosion resistance by sealing the oxide film.
The main purpose of black oxide treatment is to increase corrosion resistance, reduce reflectivity, provide surface protection, and improve the appearance of metal parts.
Black oxide treatment does not significantly affect the heat treatment of parts. However, the material of the part and heat resistance level should always be taken in to account before the process.
Controlling surface roughness after sandblasting usually involves adjusting the type of abrasive, blasting pressure and distance, and the process duration.
To further improve appearance, consider polishing, grinding, or other surface treatments such as painting and coating. These steps help achieve a smoother, shinier surface and enhance visual quality.
After sandblasting, metal surfaces are prone to oxidation. Perform corrosion protection treatments, such as applying anti-corrosion coatings or plating can help to prevent rust.
To ensure an even sandblasting effect on complex-shaped parts, adjust the angle, direction, and gun pressure, or use special fixtures and turntables.
The surface after sandblasting is prone to contamination so wearing clean gloves when handling is recommended. Surface cleaning methods include washing with water, solvent cleaning, and air blowing. The specific method depends on the material of the object and the abrasive used during sandblasting.
Sandblasting post-processing involves using a sandblasting machine to propel abrasive materials (such as sand, steel shot, or glass beads) at high speed onto the surface of an object. This process cleans, etches, changes the surface structure, and/or increases roughness. It helps remove dirt, oxidation, or old coatings and can create different surface effects on materials like metal and plastic. The blasted object may require further treatment, such as cleaning, corrosion protection, or appearance improvement, to achieve the desired results.
Anodizing aluminum forms a hard, uniform oxide layer that improves corrosion resistance, increases hardness and surface wear resistance.
The thickness of the oxide layer is usually controlled by factors such as current density, electrolyte composition, and operation time during the anodizing process. These parameters affect the growth rate of the oxide layer.
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