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Causes of Corrosion of Cooler by Circulating Water

Source: http://le-signal.com/ Time: 2019-06-27

Coolers, plate heat exchangers, and other cold-exchange equipment are prone to leaks after long-term use, and leakage points are generally concentrated in tube bundles, tube sheets, and gaskets. Air cooler manufacturers think there are many reasons for the leakage, and the most important factor causing the leakage is the corrosion of the cooler device by the circulating water.
In the circulating water system, the heat exchanger tubes of the cooler are always filled with circulating water, or they directly surround the heat exchanger tubes. The water vapor content at the gas inlet is high and the gas velocity is large. The air cooler manufacturers directly flush the tubes. The surface of the heat exchange tube is uneven, and it is easy to form microbatteries on the surface of the heat exchange tube, which causes corrosion. During the corrosion process, iron hydroxide is formed from iron and precipitated from the solution to further generate iron hydroxide: 2Fe (OH) 2 + 1 / 2H2O + 02-> 2Fe (OH) 3; iron hydroxide is dehydrated to form rust: Fe (OH) 3-> Fe00H + H2O. The electrochemical corrosion of the metal itself has a self-catalytic effect, which can accelerate the corrosion of the metal. For a long time, it will continuously corrode, which will gradually reduce the wall thickness of the cooler, and eventually cracks or perforations will occur.
Air cooler manufacturers can use buffering agents in order to effectively control corrosion and extend the life of the heat exchanger tubes. The service life of the cooler is extended, the maintenance cost is reduced, the production efficiency of the enterprise can be effectively improved, and the development of the enterprise is also beneficial.

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