Durability of anti-corrosion coatings on tube sheets

The durability of anti-corrosion coatings on tube sheets is significantly influenced by the interaction between the environment and the materials. In microchannel heat exchangers, tube sheets are exposed to high-temperature and high-pressure fluids for extended periods. The coating must resist electrochemical corrosion and attack from impurities, such as localized damage caused by chloride or sulfide ions, to prevent substrate degradation and the risk of leakage.

Durability optimization depends on the selection of coating materials and surface treatment processes. For example, using fluoropolymers or polymer composites can improve chemical stability, while plasma treatment enhances coating adhesion, reducing cracking and peeling caused by temperature fluctuations or mechanical stress.

In practical applications, tube sheet coating failure often results from the synergistic effects of multiple factors, such as microbial fouling or erosive wear accelerating aging. Through simulated corrosion tests and regular inspections, the lifespan can be predicted, and maintenance strategies can be optimized to ensure the efficient and safe operation of the heat exchanger.