.不锈钢管道焊接处海水腐蚀失效分析与机理研究.pdf

不锈钢管道焊接处海水腐蚀失效分析与机理研究 1,2 1 1 车俊铁 姬忠礼 黄俊华 （1 中国石油大学(北京)，北京 102249；2 北京石油化工学院，北京102617） 摘要：海水淡化管线系统腐蚀泄漏给淡水生产带来巨大经济损失，经现场腐蚀泄漏管线的观测和归纳，泄 漏基本发生在焊接处。本文针对不锈钢管道焊缝及其附近区域进行深入腐蚀失效分析研究，通过化学成分 分析、金相实验、腐蚀实验、X 射线衍射物相分析，σ相鉴别等实验分析手段，得到其腐蚀失效机理。 关键词：海水腐蚀 腐蚀失效分析 热影响区 σ相 分类号： TG1 STUDY ON CORROSION FAILURE ANALYSIS AND MECHANISM OF STAINLESS STEEL PIPE WELDING JOINT IN SEAWATER Che Juntie1,2ji zhongli 1 Huang Junhua1 (1 China University of Petroleum, Beijing 102249 ； 2 Beijng Institute of Petro-chemical Technology, Beijing 102617) Abstract ：The problem of corrosion leakage of seawater desalting pipe system causes great economic loss of freshwater supply. By observing and concluding corrosion leakage pipes in the scene, we find that the leakage places of seawater corrosion are on the pipe welding joint and nearby. In this paper, we lucubrate on the seawater corrosion failure in the field of steel pipe welding joint and nearby. By means of the analysis of chemical elements, metallic phase experiments, corrosion rate experiments, phase analysis of X-Ray Diffraction, σphase discrimination etc, we find a corrosion failure mechanism of seawater desalting pipes. Keywords: seawater corrosion, corrosion failure analysis, heated affected zone, σphase 不锈钢，采用普通电弧手工焊接方法施焊，焊后未 1 引言 经过热处理。取焊接处及附近材料进行分析，通过 某海滨海水淡化处理设备管道出现泄漏事故， 化学成分分析、金相实验、腐蚀速率实验、XRD 定 经现场调研发现：低压段海水管道到没有出现泄 性定量分析、σ相检测，最后确定主要腐蚀因素和 漏，高压段泄漏严重，并且都是出现的焊接处，经