Causes of corrosion on the outer wall of oil tanks and protective measures
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The environment surrounding the outer wall of the oil tank is a chemical industrial atmosphere; the main type of corrosion is galvanic corrosion, which is less severe than corrosion inside the tank. However, excellent weather resistance is required. Furthermore, the ambient temperature in which the oil tanks are located can have an adverse effect on the products; for example, high temperatures in summer are not conducive to the storage of oils with low boiling points, so insulation and cooling measures must be taken to reduce oil losses and ensure production safety. The recommended anti-corrosion coating scheme for the outer wall of oil tanks is: epoxy iron oxide rust-inhibiting primer (applied by brushing or spraying 2–3 coats, with a thickness of 80–100 μm) + epoxy ferrochrome intermediate coat (applied by brushing or spraying 2–3 coats, with a thickness of 100–120 μm) + heat-insulating and anti-corrosion topcoat for the tank (applied by brushing or spraying 2–3 coats, with a thickness of 80–100 μm). For sandblasted surfaces, an epoxy zinc-rich primer can be used (applied in 2-3 coats by brushing or spraying, with a thickness of 80-100μm) to enhance corrosion resistance. The insulation coating for storage tanks can reduce the temperature of oil products by 7–10°C during the hot summer months (compared to when no such coating is used), and it boasts excellent weather resistance, corrosion protection, and decorative properties; the paint film is resistant to being washed away by spray water.
The main causes of corrosion on the outer wall of oil tanks include galvanic corrosion in the chemical industrial atmosphere and the effect of high temperatures on low-boiling-point oils. To provide effective protection, the following measures can be taken: 1. **Base treatment**: First, thoroughly clean and remove rust from the outer surface of the oil tank; sandblasting may be employed if necessary to enhance the adhesion of the coating. 2. **Anti-rust primer**: Apply epoxy iron oxide anti-rust primer or epoxy zinc-rich primer, in 2-3 coats, with a thickness of around 80-100 microns; this helps to provide good initial rust protection. 3. **Intermediate coating**: Use epoxy ferrochrome as the intermediate coat, applying it 2–3 times by brushing or spraying, with a thickness of about 100–120 microns, to further enhance corrosion resistance. 4. **Topcoat**: Apply an insulating and anti-corrosive topcoat to the storage tank, applying 2–3 coats by brushing or spraying, with a thickness of approximately 80–100 microns. This topcoat not only helps with corrosion prevention and decoration, but also reduces the temperature of the oil in summer, thereby minimizing oil loss. Overall, through such a coating scheme, the weather resistance and safety of oil tanks can be significantly improved. .