Corrosion data for wet vinyl chloride

The corrosion data and material selection manuals state that carbon steel has poor corrosion resistance to wet vinyl chloride, mainly because the moisture and other impurities present in vinyl chloride can accelerate the corrosion process of carbon steel. However, in practical engineering applications, there are no apparent issues with using carbon steel pipes to store or transport vinyl chloride waste liquids, and this may be related to the following factors: 1. **Nature of the waste liquid**: The vinyl chloride in the waste liquid may have a low water content, or there may be other components that can slow down the corrosion process. 2. **Temperature and pressure**: When operating conditions such as temperature and pressure are low, the corrosion rate decreases, and the corrosion resistance of carbon steel may be sufficient to handle actual working conditions. 3. **Use of corrosion inhibitors**: During actual operations, corrosion inhibitors may be added to protect carbon steel pipes. 4. **Maintenance and monitoring**: Thanks to proper maintenance and regular replacement and inspection of pipes, carbon steel pipes can still be effectively used for transporting vinyl chloride waste liquid. 5. **Economic considerations**: Carbon steel is relatively inexpensive; even though there is a certain risk of corrosion, it is still chosen for economic reasons, with the risks being controlled through other methods such as the use of inhibitors and maintenance. Overall, although corrosion data indicate that carbon steel poses a certain risk of corrosion in the presence of wet vinyl chloride, other factors in practical applications (such as operating conditions and the properties of waste fluids) can vary significantly; therefore, the actual use of carbon steel pipes can be determined based on specific circumstances. When designing and selecting materials, it is still necessary to comprehensively evaluate all relevant factors to ensure the safety and cost-effectiveness of the system. .