胀紧率对传热管耐海水腐蚀性能的试验  

Experimental on Effect of Expansion Rate on Seawater Corrosion Resistance of Heat Transfer Tubes

作　　者：赵楠 李贺 金恺宸 郑子行 崔晓峰 ZHAO Nan;LI He;JIN Kaichen;ZHENG Zihang;CUI Xiaofeng(The Third Military Representative Office of the Naval Equipment Department in Shanghai,Shanghai 200031,China;Shanghai Marine Equipment Research Institute,Shanghai 200031,China)

机构地区：[1]海装驻上海地区第三军事代表室,上海200031 [2]上海船舶设备研究所,上海200031

出　　处：《船舶工程》2024年第12期81-92,129,共13页Ship Engineering

摘　　要：胀紧率是传热管胀接过程中的一个重要参数,为了研究胀紧率对传热管耐海水腐蚀性能的影响,通过开展传热单管海水浸泡试验和船用管壳式换热器样机海水流动试验,并结合试验后材料微观检测分析和电化学性能测试方法对不同胀紧率传热管的腐蚀深度、应力等进行了测量。结果表明,当管口不存在异物卡滞时,由于胀接对表面的破坏,过胀管的耐腐蚀性能低于正常胀和欠胀的传热管,异物卡滞会进一步降低传热管的耐腐蚀性能。胀接区域的残余应力为压应力,胀紧率对残余应力的影响不明显。The expansion rate is a critical parameter in heat transfer tube expansion joints.In order to study the effect of expansion rate on the seawater corrosion resistance of heat transfer tubes,the corrosion depth and stress of heat transfer tubes with different expansion rates are measured by conducting the seawater immersion test of heat transfer single tube and the seawater flow test of the marine shell and tube heat exchanger prototype,and combined with the post-test material microscopic inspection and analysis and the electrochemical performance test method.The results show that the corrosion resistance of an over-expanded tube is lower than that of a normal or under-expanded heat transfer tube due to the destruction of the tube surface if there is no foreign body stagnation at the tube orifice.The foreign body stagnation further reduces the corrosion resistance of the heat transfer tubes.The residual stress in the expansion joint area is compressive stress,and the effect of expansion rates on the residual stress is not significant.

关 键 词：胀紧率 传热管 海水 耐腐蚀 

分 类 号：U671.84[交通运输工程—船舶及航道工程]