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What causes corrosion of welded plate heat exchanger plates

What causes corrosion of welded plate heat exchanger plates

(Summary description)Due to its own advantages, welded plate heat exchangers are more widely used in various industries. However, welded plate heat exchangers often suffer from corrosion during use.

What causes corrosion of welded plate heat exchanger plates

(Summary description)Due to its own advantages, welded plate heat exchangers are more widely used in various industries. However, welded plate heat exchangers often suffer from corrosion during use.

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Due to its own advantages, welded plate heat exchangers are more widely used in various industries. However, welded plate heat exchangers often suffer from corrosion during use. Welded plate heat exchanger company introduces the corrosion problem of plate heat exchanger plates:

welded plate heat exchanger

1.welded plate heat exchanger plates are formed by mechanical stamping, and a certain amount of surface residual stress is inevitably remaining. For stainless steel sheets that do not contain molybdenum, the elimination of surface residual stress is very difficult, or even impossible.

2. The harmful elements in the bottom of the sealing groove are often precipitated by the Cl- in the binder due to the increase in temperature. Such as neoprene series adhesives and compressed asbestos, the precipitated and enriched Cl- and H+ form HCl under water and steam conditions, causing serious stress corrosion cracking at the bottom of the groove and undergoing certain corrosion. During the incubation period, stress corrosion cracking may occur. Trying to destroy any of the above conditions during the selection, installation and use of the plate heat exchanger can effectively prevent or delay the occurrence of corrosion and make the equipment operate safely and normally.

3. The welded plate heat exchanger plates are assembled to form a multi-slit structure, such as the contacts between the plates and the bottom of the sealing groove. The crevices are easy to cause the enrichment of Cl-, and the degree of local enrichment often far exceeds the ability of stainless steel to resist stress corrosion.

4. When the dirt on the surface of the welded plate heat exchanger is serious, the corrosive elements in the medium may be attached to the dirt in a large amount and be enriched in the cracks at the bottom of the scale.
 

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Time of issue:2020-02-11 00:00:00

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