Chemical pump corrosion resistance is a critical factor when selecting the right equipment for industrial applications. These pumps are often exposed to harsh and corrosive media, making their ability to resist corrosion essential for long-term performance and safety. Understanding the different types of metal corrosion can help in evaluating the suitability of materials used in chemical pumps.
Metal corrosion typically falls into three main categories: â‘ film corrosion, where a protective passive layer forms on the surface, reducing further damage; â‘¡ non-film corrosion, which is more dangerous as it allows continuous and widespread corrosion without any protective barrier; and â‘¢ localized corrosion, which is the most common type in chemical equipment, accounting for about 70% of all cases. Localized corrosion includes various forms such as crevice corrosion, intergranular corrosion, and stress corrosion cracking.
To assess the corrosion resistance of metal materials, two primary standards are commonly referenced. According to the "Petrochemical Enterprises Pipeline Design Equipment Selection Rules," corrosion resistance is categorized based on annual corrosion rates:
- Less than 0.05mm/year: fully corrosion-resistant.
- 0.05–0.1mm/year: corrosion-resistant.
- 0.1–0.5mm/year: still considered corrosion-resistant.
- More than 0.5mm/year: not corrosion-resistant.
Another standard, outlined in the "Metal Corrosion Prevention Manual," divides corrosion resistance into 10 grades based on annual corrosion rates:
- Grade 1 (≤0.001mm/year): completely corrosion-resistant.
- Grade 2 (0.001–0.005mm/year): highly resistant.
- Grade 3 (0.005–0.01mm/year): very resistant.
- Grade 4 (0.01–0.05mm/year): resistant.
- Grade 5 (0.05–0.1mm/year): moderately resistant.
- Grade 6 (0.1–0.5mm/year): somewhat resistant.
- Grade 7 (0.5–1.0mm/year): still resistant.
- Grade 8 (1.0–5.0mm/year): less resistant.
- Grade 9 (5.0–10.0mm/year): slightly resistant.
- Grade 10 (>10.0mm/year): not resistant at all.
By understanding these standards, companies can make informed decisions when selecting chemical pumps. It's crucial for chemical manufacturers to ensure that the pumps they purchase are made from high-quality, corrosion-resistant materials. Choosing inferior or counterfeit products can lead to severe operational issues, downtime, and even costly accidents. Therefore, careful evaluation and verification of material specifications are essential to avoid long-term losses and maintain safe and efficient operations.
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