Discussing the over-temperature failure of anti-corrosion coatings

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Organic coatings are generally used at room temperature; their maximum applicable temperature is below 100°C. If the operating environment exceeds 100°C, silicone-based high-temperature resistant paints, inorganic zinc-rich paints, or aluminum pigment paints should be selected instead. For heated coils installed at the bottoms of wax-containing heavy oil tanks and crude oil tanks, through which steam at 180°C is circulated, high-temperature, oil-resistant, and anti-corrosive coatings should be used; otherwise, they may become ineffective. Furthermore, overheating damage can only occur under improper operation. Coolers with amino-epoxy coatings generally do not experience any problems after 3 to 4 years of operation. But sometimes, when stopping the operation, the water valve is closed first and then the material valve, which causes the coating to be exposed to temperatures far above what it can tolerate for a short period of time; this leads to discoloration of the coating, or even peeling and delamination.