Corrosion-resistant materials for heat exchangers
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How many of you have used anti-corrosion materials for heat exchangers from abroad? What are the advantages in performance compared to domestic materials?
Does it refer to metallic materials or non-metallic materials? In terms of the corrosion resistance of graphite heat exchangers, there is no significant difference between foreign brands (which are actually also domestic products) and domestic brands.
Imported polymer anti-corrosion coatings and repair materials?
It mainly refers to non-metallic materials. Experts in the industry often say that foreign non-metallic materials (taking coatings as an example) have clear advantages over those available in China, yet high-end products are rarely used in China; I hope to learn more about this from fellow enthusiasts. I hope you can kindly offer your advice!
Could you be more specific? What type of materials are they, and in what applications are they used?
Polymer-based ceramic repair materials and polymer-ceramic coatings are available from DEP in the UK and Belzona in the US for use in heat exchangers; the choice of material ultimately depends on the operating conditions of your heat exchangers.
The anti-corrosion measures for heat exchangers mainly involve the use of improved materials; at the same time, optimizing processes and improving operating conditions can also help to control corrosion effectively, keeping its level within acceptable limits. As for the use of coatings for corrosion protection on chemical equipment such as pipes, reactors, and containers, it yields excellent results. However, when applied to shell-and-tube heat exchangers, its effectiveness for corrosion protection is not satisfactory due to the structural characteristics of these heat exchangers.
Material upgrades are primarily used in media environments where existing coatings, platings, or other linings are insufficient to provide protection. After all, such material upgrades come with high cost implications. In environments where operating conditions are not too harsh or temperatures are not too high, heat exchangers often make use of coatings or platings for corrosion prevention; the market size for this application is estimated to be several million square meters per year. However, due to structural constraints, linings may not be feasible to use in such cases.