Analysis on Corrosion Leakage Causes of Stainless Steel Corrugated Heat Exchanger Plate

• Published in: Cai liao bao hu Vol. 56; no. 5; pp. 212 - 216
• Main Author: ZHENG Jian-jun, FAN Zi-ming, TIAN Feng, CHEN Hao, SUN Yun-fei
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Materials Protection 01.05.2023
• Subjects: plate heat exchanger|corrugated heat exchanger plate|pitting corrosion|newton's ring|leakage
• ISSN: 1001-1560
• DOI: 10.16577/j.issn.1001-1560.2023.0127

During the operation of plate type radiator used in a certain project, the stainless steel corrugated heat exchanger plate experienced a leakage fault. In this paper, the leakage causes of corrugated heat exchanger plate were comprehensively analyzed by means of macro morphology analysis, chemical composition analysis, metallographic microstructure examination, observation of microscopic morphology by scanning electron microscope (SEM) and X-ray energy dispersive spectroscopy (EDS). Results indicated that the roughness of the high temperature oxidation film formed on corrugated heat exchanger surface, especially the center of Newton's ring, was large. This point was also the bulge of the cold stamping groove with high density of dislocations. And this point was the protrusion of the cold stamping groove, with a higher dislocation density. During the process of long-term operation, Cl- continuously accumulated at this location, forming pitting nuclei and ultimately inducing pitting. In addition, under the effe