Failure analysis of heat exchanging tube of marine condenser

XIONG Cong-gui，LIN Tong，WANG Xing-guang，WANG Jian-dong

（Wenling Qianjiang Chemical Engineering Machinery Co. Ltd.，Wenling 317500，China）

Abstract：Aiming at the problem of marine condenser copper alloy tube corrosion failure，corrosion failure analysis on the copper alloy tube was carried out. Appearance of the failure position on the tube were analyzed. The chemical composition of the material on the failure tube and the intact tube were analyzed，and were compared with the standard value of the chemical composition of material. The corrosion products of the failure location were analyzed by the energy dispersive X-ray analysis using the scanning electron microscopy on the tube. The corrosion pit of the failure location were analyzed by scanning electron microscope analysis on the tube. The results show that，the corrosion is begin from inside of the tube，and detected at the corrosion position of the tube did not arsenic element. Combined with the corrosion mechanism of copper alloy in seawater，the experimental results show that，the seawater condenser tube failure is the segregation of arsenic in materials of the tube caused by dezincification corrosion.