Through this period of understanding, I believe that everyone is no stranger to plate heat exchangers, but for customers who want to know more about this product, these contents are not enough. Today, Xiaobian will share with you the knowledge about the corrosion of plate heat exchangers , hoping to attract everyone's attention and let everyone have a deep understanding of plate heat exchangers. In this way, everyone can know what to buy when using the plate heat exchanger, and don't panic, I hope to inspire and help everyone. Main causes of corrosion of plate heat exchangers :
(1) Stainless steel heat transfer plates are mechanically stamped, and a certain amount of surface residual stress will inevitably remain. For stainless steel sheets that do not contain molybdenum, the removal of surface residual stress is difficult or even not feasible .
(2) Multi-gap structures are formed after the plates are assembled, such as the contacts between the plates and the bottom of the sealing groove. The gap easily causes Cl- enrichment, and the local enrichment often far exceeds the ability of stainless steel to resist stress corrosion.
(3) When the dirt on the surface of the plate is serious, the intervening corrosive elements (Cl, S, etc.) may be attached to the dirt in large quantities and enriched in the gaps at the bottom of the dirt.
(4) The harmful elements in the bottom of the sealed tank are often precipitated by Cl in the binder due to the temperature rise. Such as neoprene adhesives and compressed asbestos (containing CaCl2), often under the conditions of water and steam, the precipitated enriched Cl- and H + form HCl, which causes severe stress corrosion cracking at the bottom of the groove.
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