板壳换热器腐蚀失效分析  

Analysis on Corrosion Failure of Plate-shell Heat Exchanger

作　　者：冯萍萍[1] 杨贵荣[1] 宋文明[1,2] 

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [2]甘肃蓝科高新石化装备股份有限公司,甘肃兰州730070

出　　处：《热加工工艺》2017年第22期249-252,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51205178);甘肃省自然科学基金项目(1208R-JZA189)

摘　　要：板壳换热器在运行过程中会发生腐蚀失效。对板壳换热器腐蚀区域进行表面形貌、微观组织、腐蚀形貌和腐蚀产物分析。结果表明:板壳换热器的微观组织均为奥氏体+带状分布的铁素体,主要发生了点蚀和均匀腐蚀,壳程表面腐蚀比板程严重。凸起剥落与局部腐蚀性介质富集及微振磨损有关。管板腐蚀的主要原因为介质中的氯离子与硫离子。The plate-shell heat exchanger generated corrosion failure during, operating. The surface morphology, microstructure, corrosion morphology and corrosion product, of corrosion zone of plate-shell exchanger were analyzed. The results show that the microstructure of plate-shell heat exchanger is anstenite and ferrite in banding distribution. The pitting corrosion and tmiform corrosion happen. The corrosion of shell side is severer than that of the plate. The raised spalling has a relationship with local enrichment of corrosive medium and fretting. The main reason for the corrosion of tube sheet is Cl- and S2- in corrosion medium.

关 键 词：换热器 腐蚀形貌 腐蚀产物 

分 类 号：TG113[金属学及工艺—物理冶金] TG172.63[金属学及工艺—金属学]