W0714己内酰胺薄膜蒸发器下料管管壁腐蚀减薄失效分析

中国腐蚀与防护学报, 2011, 31(6): 488-492.

W0714己内酰胺薄膜蒸发器下料管管壁腐蚀减薄失效分析

杨根柱 , 李庆华 , 刘国帅 , 王博 , 刘杰 , 熊金平 , 何少平 , 陆正良

1.1. 中国石油化工股份有限公司石家庄炼化分公司石家庄 0500322. 北京化工大学碳纤维及功能高分子教育部重点实验室

1.1. Shijiazhuang Refining Branch, China Petrochemical Co. Ltd., Shijiazhuang 0500322. Key Laboratory of Carbon Fiber and Functional Polyners of Ministry of Education, Beijing University of Chemical Technology, Beijing 1000293. Beijing Gas Group Co., Ltd., Beijing 1000114. Central Iron &

关键词：薄膜蒸发器 , stainless steel pipe , corrosion failure

CORROSION OF TREMIE PIPE OF W0714 FILM EVAPORATOR OF HEXANOLACTAM

YANG Genzhu , LI Qinghua , LIU Guoshuai , WANG Bo , LIU Jie , XIONG Jinping , HE Shaoping , LU Zhengliang

Keywords： film evaporator , 不锈钢管 , 腐蚀失效

用化学方法、金相显微镜和扫描电镜等对腐蚀减薄失效后的W0714己内酰胺薄膜蒸发器下料管管壁进行了分析，结果表明：此设备用304L不锈钢管壁在非氧化性介质中发生了非敏化态的晶间腐蚀，其腐蚀失效的原因是过钝化电位范围内的电化学溶解所致。

Corrosion mechanism of Tremie pipe of W0714 film evaporator of hexanolactam was investigated by chemical method, optical microscope and SEM etc.. the results showed that the non-sensitive intergranular corrosion took place on the Tremie pipe in the non-oxidizability medium. the potential of 304L SS in the medium was located at the transpassivation region, which resulted in the corrosion of the Tremie pipe.

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