Chemical pump corrosion resistance identification is a critical factor in ensuring the long-term performance and safety of these systems. In most cases, chemical pumps are exposed to corrosive media, making their corrosion-resistant properties essential for reliable operation. Understanding the mechanisms and classifications of metal corrosion can help in selecting the right materials for such applications.
Metal corrosion typically falls into three main categories. The first is **film corrosion**, where a protective oxide layer forms on the metal surface, reducing further degradation. This type of corrosion is generally less severe as the passivation layer acts as a barrier against further damage. The second is **non-film corrosion**, which occurs without the formation of a protective layer. This form of corrosion tends to be more dangerous because it progresses uniformly across the material, leading to faster deterioration. The third category is **local corrosion**, which is the most common in chemical equipment. According to industry surveys, local corrosion accounts for about 70% of all corrosion issues in chemical plants. Local corrosion includes various types, such as **crevice corrosion**, **intergranular corrosion**, and **stress corrosion cracking**, each presenting unique challenges depending on environmental conditions.
To evaluate the corrosion resistance of metals, two primary standards are commonly used. One is outlined in the *"Petrochemical Enterprises Pipeline Design Equipment Selection Rules"*, which categorizes materials based on their annual corrosion rate:
- **Fully corrosion-resistant**: less than 0.05 mm/year
- **Corrosion-resistant**: 0.05–0.1 mm/year
- **Still corrosion-resistant**: 0.1–0.5 mm/year
- **Non-corrosion-resistant**: more than 0.5 mm/year
Another standard comes from the *"Metal Corrosion Prevention Manual"*, which classifies materials into **10 corrosion resistance grades** based on their annual corrosion rate:
- **Grade 1**: <0.001 mm/year – completely corrosion-resistant
- **Grade 2**: 0.001–0.005 mm/year – very corrosion-resistant
- **Grade 3**: 0.005–0.01 mm/year – highly resistant
- **Grade 4**: 0.01–0.05 mm/year – corrosion-resistant
- **Grade 5**: 0.05–0.1 mm/year – moderately corrosion-resistant
- **Grade 6**: 0.1–0.5 mm/year – somewhat corrosion-resistant
- **Grade 7**: 0.5–1.0 mm/year – still resistant
- **Grade 8**: 1.0–5.0 mm/year – slightly corrosion-resistant
- **Grade 9**: 5.0–10.0 mm/year – low corrosion resistance
- **Grade 10**: >10.0 mm/year – no corrosion resistance
By understanding these standards, engineers and plant managers can make informed decisions when selecting materials for chemical pumps. It's especially important for chemical companies to ensure that the pumps they purchase are made from high-quality, corrosion-resistant materials. Choosing substandard or counterfeit products can lead to serious operational failures, costly repairs, and even safety hazards. Therefore, careful evaluation and verification of material specifications are crucial to avoid potential losses and maintain system integrity over time.
Simple installation, different lamps can be equipped, and the number of lamps can be increased or decreased freely. When there is no limit to the number of lamps installed on the track, it can theoretically not exceed the wattage of the transformer power supply.
Magnetic Spot Light,Magnetic Light Track,Magnetic Pendant Light,Led Magnetic Track Light
JINGYING , https://www.jingyinglight.com