某油冷却器换热管泄漏原因  

Leakage reason of heat exchange tube of oil cooler

作　　者：许恒庭 武英英[1] 姚文德 刘维丽[1] 陈莉[1] XU Hengting;WU Yingying;YAO Wende;LIU Weili;CHEN Li(Shanghai Spaceflight Precision Machinery Institute,Shanghai 201600,China)

机构地区：[1]上海航天精密机械研究所,上海201600

出　　处：《理化检验（物理分册）》2024年第4期37-41,45,共6页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某公司生产的油冷却器换热管在投入使用9~12个月后发生腐蚀泄漏现象。采用宏观观察、化学成分分析、金相检验、扫描电镜和能谱分析、原子吸收光谱分析等方法分析了管道腐蚀泄漏的原因。结果表明:油冷却器换热管介质中的氯离子和硫离子在管内壁积垢中沉积并富集在管壁基体前沿,导致内壁产生大量点腐蚀,点腐蚀位置与未腐蚀位置形成大阴极小阳极腐蚀电池,增大了腐蚀速率,在管内介质的冲刷作用下,点腐蚀坑进一步扩大,最终导致管道泄漏。Corrosion leakage occurred in the heat exchange tube of oil cooler produced by a company after it was put into use for 9-12 months.The causes of pipeline corrosion and leakage were analyzed by means of macroscopic observation,chemical composition analysis,metallographic examination,scanning electron microscopy and energy spectrum analysis,and atomic absorption spectrometry.The results show that the chloride ions and sulfur ions in the heat exchange tube medium of the oil cooler were deposited in the fouling of the inner wall of the tube and enriched in the front of the tube wall matrix,resulting in a large number of pitting corrosion on the inner wall.The pitting corrosion position and the uncorroded position formed a large cathode and small anode corrosion cell,which accelerated the corrosion rate,and the pitting corrosion pit was further expanded under the erosion of the medium in the tube,which eventually led to the leakage of the pipeline.

关 键 词：镍白铜 油冷却器换热管 点腐蚀 氯离子和硫离子 腐蚀电池 

分 类 号：TH142.3[一般工业技术—材料科学与工程] TG115.2[机械工程—机械制造及自动化]