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How to stop flash rusting after wet blasting
Wet blasting is an effective method for surface preparation, combining water and abrasive blasting to remove contaminants, coatings, and corrosion. However, one common challenge after wet blasting is flash rusting – rapid oxidation that occurs when metal surfaces are exposed to moisture and air. Preventing flash rusting is crucial to maintaining the integrity of the treated surface and ensuring the success of subsequent coatings or treatments.
Why does flash rusting occur?
Flash rusting happens when the water used in wet blasting leaves behind moisture on the metal surface. This moisture reacts with oxygen, causing rust to form quickly – sometimes within minutes. The risk is particularly high in humid environments or when using untreated water that contains chlorides or other contaminants.
How to prevent flash rusting after wet blasting
- Use a rust inhibitor: Applying a rust inhibitor immediately after wet blasting can significantly slow down oxidation. These inhibitors create a protective barrier that prevents moisture and oxygen from triggering corrosion. Choose an inhibitor compatible with your next surface treatment or coating.
- Dry the surface quickly: Speed is essential when preventing flash rust. Use compressed air, heat guns, or dehumidifiers to remove excess moisture immediately after wet blasting. If possible, conduct abrasive blasting in a controlled environment with good ventilation to accelerate drying, such as a blast room or blast booth.
- Use treated or deionised water: Minerals and contaminants in regular tap water can contribute to flash rusting. Using treated or deionised water during the wet blasting process reduces the chances of unwanted chemical reactions that accelerate oxidation.
- Apply a protective coating immediately: Once the surface is dry and free from flash rust, apply a primer, sealant, or protective coating as soon as possible. This step is crucial in preventing further oxidation and ensuring that the surface treatment remains effective.
- Monitor humidity levels: High humidity increases the likelihood of flash rusting. If working in a humid environment, use climate control solutions such as dehumidifiers or air movers to maintain optimal conditions for surface preparation.
Final thoughts
Flash rusting can compromise the results of wet blasting if not addressed promptly. By using rust inhibitors, ensuring quick drying, and controlling environmental factors, you can maintain a clean, rust-free surface ready for further treatment or coating.
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