Thread Content
During the production process in petrochemical plants, many corrosive substances exist and are generated. The type, chemical composition, concentration, pH value, impurities, moisture content, and oxygen level of these substances are all external factors that contribute to corrosion. The faster the flow rate of the medium, the greater the likelihood of corrosion, as the flowing medium erodes the protective film, creating vortices, turbulence, and bubbles that lead to severe impact wear and cavitation corrosion. Additionally, improper material selection can lead to surface corrosion if the equipment’s surface comes into contact with corrosive substances and the equipment itself is not resistant to corrosion. The rougher the surface, the more prone it is to corrosion; the resulting symptoms include leakage, premature wear, damage, and noise. Uniform surface corrosion occurs in two forms: film-forming and film-free. Film-free corrosion is very dangerous, and the corrosion process proceeds at a certain rate; this is mainly caused by incorrect material selection. Lack of anti-corrosion measures or poor construction quality create an environment conducive to corrosion damage. Different environments require different materials. During the production of equipment, it is often not possible to balance material selection with resistance to environmental corrosion. Differences in temperature, concentration, and pressure lead to different material choices and varying levels of corrosion. Moreover, poor quality control during construction results in inadequate construction standards, making corrosion an inevitable issue. Over-temperature and over-pressure during operation, inadequate equipment management, and a lack of attention are also among the causes of corrosion damage. Generally, the higher the temperature of the medium, the higher the pressure, and the faster the corrosion occurs, as corrosion is a chemical reaction; for every 10°C increase in temperature, the corrosion rate increases by 1 to 3 times.