Metal surface cleaning is the process of making metal suitable for coating, painting, assembly, or use by removing oil, dirt, oxides, rust, and processing residues from the surface. The correct method selection depends on the type of metal, the level of contamination, and the intended use.
1. Removal of Coarse Contaminants from the Surface
The first step is usually mechanical cleaning.
- Removing loose dirt and rust with a wire brush
- Removing chips and dust with compressed air
- Cleaning large residues with a cloth or scraper
Purpose: to basically prepare the surface
2. Oil and Grease Cleaning
This is the most common type of contamination on metal surfaces.
- Solvent-based cleaners
- Alkaline degreasers
- Spray or immersion method
Purpose: to completely degrease the surface
3. Chemical Cleaning
Used for more stubborn dirt and oxides.
- Rust remover chemicals
- Acidic or alkaline solutions
- Industrial cleaning gels
4. Rinsing Process
Necessary for removing chemical residues.
- Washing with clean water
- Using pressurized water
- Neutralization process if necessary
5. Drying
Remaining moisture accelerates rust formation.
- Drying with compressed air
- Oven or hot air application
- Fast evaporating solvents
6. Surface Finishing and Protection
Metal should be protected after cleaning.
- Anti-corrosion spray or oil
- Paint or coating application
- Galvanization process
7. Mechanical and Advanced Methods
- Shot blasting
- Ultrasonic cleaning
- Electro-chemical cleaning
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