Steel shot corrosion prevention is crucial for maintaining the quality and durability of abrasive materials used in industrial processes. Steel shot rusts due to exposure to moisture, oxygen, and contaminants, which accelerate corrosion. Effective shot protection against rust is crucial for preserving its properties and durability in industrial applications. According to GalvanizeIt – Corrosion Rate of Carbon Steel in Atmospheric Environments, when relative humidity exceeds 70–80% and the temperature is above 0°C (32°F), the corrosion rate of steel significantly increases, leading to the loss of mechanical properties and reduced abrasive quality. These findings confirm the importance of controlling environmental conditions during steel shot storage to limit rusting and extend the service life of the material. In this article, we present the most effective ways to prevent shot corrosion and proper storage guidelines.
- High air humidity (>50%)
- Improper storage conditions
- Lack of stock rotation
- Contaminants (oil, salt, chemicals)
Types of shot and susceptibility to corrosion
| Type of shot | Corrosion susceptibility | Application |
|---|---|---|
| High-carbon steel shot | Medium | Treatment of steel components |
| Low-carbon steel shot | Higher | Blasting of lightweight structures |
| Stainless shot | Low | Food, chemical industries |
How to store shot to prevent rust?
Proper industrial shot storage is a fundamental way to prevent corrosion. It protects the material from moisture and contaminants, while maintaining its abrasive properties.
Optimal storage conditions for steel shot:
- Relative humidity below 50%
- Constant temperature (no daily fluctuations)
- Ventilated rooms without exposure to rain or steam
- Impermeable flooring, preferably concrete with insulation
Packaging selection and stock rotation:
- Use anti-corrosion bags or sealed drums
- Rotate shot every 3–6 months
- Regularly check warehouse humidity levels (use a hygrometer)
Effective protection against corrosion – proven methods
- Using corrosion inhibitors
- Air-drying and automatic climate control systems
- Isolating shot from contaminants (oil, acids, salts)
- Drying shot before reuse or after transport
Common mistakes – why does shot rust despite protection?
Despite using various protection methods, shot often rusts in practice. Many of these problems stem from fundamental mistakes related to improper storage and handling. One of the most serious errors is storing shot outdoors, even under a roof. In such conditions, although seemingly protected from rainfall, air humidity and temperature fluctuations still have a negative impact, promoting corrosion.
Additionally, neglecting to clean the shot regularly after technological processing is another major cause of corrosion. Residual contaminants, oils, or other substances on the surface can act as catalysts, accelerating chemical reactions and degrading its properties. Therefore, systematic cleaning is a key element of proper maintenance and operation.
Finally, it’s important to emphasize that improper packaging or lack of protective materials significantly increases the shot’s susceptibility to rust. Inadequate films, containers, or mechanical damage can allow moisture and impurities to penetrate, resulting in corrosion. The optimal solution is to use moisture-resistant packaging, often supplemented with corrosion inhibitors (e.g., VCI inserts), which provide long-term surface protection.
Summary: how to effectively prevent shot corrosion?
To effectively prevent shot rusting, it is essential not only to use proper storage methods but also to invest in protective solutions and technical awareness. If you want to minimize losses and maintain high abrasive quality, follow the recommendations listed above.
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