Anti corrosion maintenance and protection technology for chemical storage tanks

The anti-corrosion maintenance of chemical storage tanks needs to be combined with material characteristics and usage environment to control corrosion risks from the source. Metal storage tanks are susceptible to corrosion from acidic and alkaline media, and their surfaces require anti-corrosion coatings. The coating material should have good adhesion and chemical resistance, and epoxy, polyurethane, and other coatings can be selected according to the type of media. Before coating construction, rust removal treatment should be carried out on the surface of the tank to ensure a tight bond between the coating and the metal surface, and to avoid corrosion propagation caused by local detachment. Non metallic storage tanks such as fiberglass and plastic materials, although they have certain corrosion resistance, are prone to aging and wear after long-term use. It is necessary to regularly check the surface integrity and repair small cracks and damages in a timely manner.

Cathodic protection technology is an important means of corrosion prevention for metal storage tanks. By connecting an external power source or sacrificing an anode, cathodic polarization is formed on the surface of the tank to suppress electrochemical corrosion. The sacrificial anode method is suitable for small storage tanks, and active metals such as zinc and magnesium are commonly used as anode materials. Regular replacement can maintain the protective effect. The external current method is suitable for large storage tanks. By adjusting the current parameters, the protection potential can be accurately controlled to avoid over protection or insufficient protection. The accessories of the storage tank, such as flanges, manholes, and other connecting parts, are prone to leakage due to crevice corrosion. Double protection with sealing gaskets and anti-corrosion coatings is required, and the tightening of bolts should be regularly checked to prevent seal failure caused by stress changes.

In daily maintenance, it is necessary to regularly monitor the corrosion status of the inner and outer surfaces of the storage tank, and evaluate the degree of corrosion through ultrasonic thickness measurement, coating testing, and other methods. The temperature and pressure changes of the storage medium will accelerate the corrosion process, and it is necessary to strictly control the operating parameters to avoid excessive temperature or pressure fluctuations of the medium. For storage tanks that have been out of use for a long time, it is necessary to empty the internal medium and dry them, fill them with inert gas or apply rust inhibitors to prevent corrosion during idle periods. By comprehensively utilizing coating protection, cathodic protection, and daily monitoring, the service life of chemical storage tanks can be effectively extended and safety hazards can be reduced.