深海用X70管线钢焊接接头腐蚀行为研究

doi:10.11900/0412.1961.2017.00149

金属学报

2018, Vol. 54

Issue (4): 527-536 DOI: 10.11900/0412.1961.2017.00149

本期目录 | 过刊浏览

深海用X70管线钢焊接接头腐蚀行为研究

马歌, 左秀荣(

), 洪良, 姬颖伦, 董俊媛, 王慧慧

郑州大学材料物理教育部重点实验室郑州 450052

Investigation of Corrosion Behavior of Welded Joint of X70 Pipeline Steel for Deep Sea

Ge MA, Xiurong ZUO(

), Liang HONG, Yinglun JI, Junyuan DONG, Huihui WANG

Key Laboratory of Material Physics, Ministry of Education, Zhengzhou University, Zhengzhou 450052, China

引用本文:

马歌, 左秀荣, 洪良, 姬颖伦, 董俊媛, 王慧慧. 深海用X70管线钢焊接接头腐蚀行为研究[J]. 金属学报, 2018, 54(4): 527-536.
Ge MA, Xiurong ZUO, Liang HONG, Yinglun JI, Junyuan DONG, Huihui WANG. Investigation of Corrosion Behavior of Welded Joint of X70 Pipeline Steel for Deep Sea[J]. Acta Metall Sin, 2018, 54(4): 527-536.

全文: PDF(6540 KB) HTML

摘要:

通过浸泡实验、失重实验、电化学实验对深海用厚规格X70管线钢焊接接头各区域耐蚀性进行研究,利用XRD分析其钝化膜的组成,利用SEM观察其显微组织。结果表明,焊缝的耐蚀性最优,热影响区耐蚀性次之,近热基体耐蚀性最差,且对于相同区域,内焊的耐蚀性优于外焊。内层腐蚀产物Fe₃O₄形成致密的钝化膜能有效减缓反应的进行,外层疏松的腐蚀产物Fe₂O₃、FeOOH、Fe(OH)₃对基体无保护作用。焊缝处微观组织多为晶内形核铁素体,且马氏体-奥氏体(M-A)组元细小且均匀分布,耐蚀性最好;热影响区组织梯度变化最大,M-A组元粗大,耐蚀性次于焊缝;近热基体由铁素体和贝氏体组成,贝氏体呈岛状分布,耐蚀性最差。内焊部分受外焊热循环的影响,微观组织更加细化,M-A组元体积分数较多,耐蚀性好于外焊。

关键词 ： X70管线钢, 点蚀, 夹杂物, 微观组织, M-A组元

Abstract：

X70 pipeline steel with thick specifications (40.5 mm) for 3500 m deep sea reached the international advanced level in the wall thickness and service depth. Due to the high heat input during the welding process, the corrosion resistance of inside welding and outside welding would vary depending on the microstructure differences. The corrosion resistance of the welded joints of X70 pipeline for deep sea was studied by the immersion test, the weight loss test, the electrochemical test in this work. The components of the passive film were analyzed by XRD and the microstructure was observed by SEM. The results show that the corrosion resistance of the weld metal is the best. The corrosion resistance of the heat affected zone follows. The corrosion resistance of the base metal is the worst. And for the same area, the corrosion resistance of the inside welding is better than that of the outside welding. The formation of dense Fe₃O₄ passivation film can effectively slow down the progress of the reaction, and the corrosion products of Fe₂O₃, FeOOH and Fe(OH)₃ which are loose in the outer layer, have no protective effect on the matrix. The microstructure of the weld metal with the best corrosion resistance is mostly the intragranular nucleation ferrite and martensite-austenite (M-A) constituent is fine and uniform. The microstructure gradient of the heat affected zone is the largest, the M-A constituent is coarse and the corrosion resistance is inferior to the weld metal. The base metal consists of ferrite and bainite, the bainite is island-like distribution and the corrosion resistance is the worst. Microstructure of the inside welding is more refined, owing to the influence of outside welding thermal cycle, and the volume fraction of M-A constituent in inside welding is higher than that of the outside welding, so the corrosion resistance is better than that of the outside welding.

Key words： X70 pipeline pitting inclusion microstructure M-A constituent

收稿日期: 2017-04-25

ZTFLH:

TG172.6

作者简介:

作者简介马歌,女,1991年生,硕士

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图1 X70管线钢示意图及焊接接头宏观形貌图

表1 X70管线钢母材和焊缝的化学成分

图2 焊接接头在3.5%NaCl溶液中浸泡2 h后的宏观形貌

图3 焊接接头在3.5%NaCl溶液中浸泡2 h后的的OM像

图4 焊接接头在3.5%NaCl溶液中浸泡2 h后点蚀坑统计结果

图5 焊接接头在3.5%NaCl溶液中失重实验结果

图6 焊接接头在3.5%NaCl溶液中浸泡96 h后钝化膜的XRD谱

图7 焊接接头各区域的开路电压

图8 焊接接头各区域动电位极化曲线

表2 焊接接头各区域自腐蚀电位与自腐蚀电流密度

图9 焊接接头在3.5%NaCl溶液中浸泡96 h后的夹杂物形态及EDS分析

图10 焊接接头各区域的SEM像

图11 外焊各个区域M-A组元形貌的OM像

图12 焊接接头单位面积内M-A组元尺寸分布

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