Mg处理X70级抗酸性海底管线钢 (X70MOS) 成分设计及耐蚀性能研究

doi:10.11902/1005.4537.2020.213

中国腐蚀与防护学报

2021, Vol. 41

Issue (5): 617-624 DOI: 10.11902/1005.4537.2020.213

研究报告

本期目录 | 过刊浏览

Mg处理X70级抗酸性海底管线钢 (X70MOS) 成分设计及耐蚀性能研究

郎丰军¹^,²^,³, 黄峰²^,³(

), 徐进桥³, 李利巍³, 岳江波³, 刘静¹^,²

^1.武汉科技大学省部共建耐火材料与冶金国家重点实验室武汉 430081
^2.武汉科技大学湖北省海洋工程材料及服役安全工程技术研究中心武汉 430081
^3.宝钢股份中央研究院武汉 430080

Composition Design and Corrosion Resistance of Mg Microallyed X70 Grade Acid Resistant Submarine Pipeline Steel (X70MOS)

LANG Fengjun¹^,²^,³, HUANG Feng²^,³(

), XU Jinqiao³, LI Liwei³, YUE Jiangbo³, LIU Jing¹^,²

^1.The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
^2.Hubei Engineering Technology Research Center of Marine Materials and Service Safety, Wuhan University of Science and Technology, Wuhan 430081, China
^3.Baosteel Central Research Institute, Wuhan 430080, China

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摘要:

利用OLI Analyzer Studio软件，模拟海底管线管内NACE A和管外3.5%NaCl腐蚀环境，计算合金元素添加量对X70海底管线钢腐蚀速率的影响规律。在保证X70海底管线钢力学性能前提下，设计成分并轧制含0.003%Mg和无Mg的X70MOS实验钢。运用电化学测试技术和NACE TM 0284-2016标准，研究和评估X70MOS实验钢和常规X70海底管线钢的耐蚀性能和抗HIC性能。结果表明，Mg处理钢在NACE A溶液中较无Mg处理钢、X70海底管线钢腐蚀速率分别降低14.3%和73.3%，在3.5%NaCl溶液中分别降低52.8%和80.4%。Mg处理钢HIC敏感性较无Mg处理钢、X70海底管线钢大大降低，满足NACE标准规定值。X70MOS钢研制中使用0.003% Mg处理不仅可以降低合金成本，而且具有提高耐蚀性和抗HIC性能作用。

关键词 ： X70MOS钢, Mg处理, 成分设计, 耐蚀性能

Abstract：

The corrosion rate of X70 submarine pipeline steel with alloying element addition in the so called NACE A medium and 3.5%NaCl solution was calculated by means of OLI analyzer studio software in order to simulate the corrosion situation of inner side and outer side of the real pipeline in service. Under the premise of ensuring the mechanical properties of X70 submarine pipeline steel, experimental X70MOS steels without and with 0.003% Mg-addition were designed and rolled. Then their corrosion resistance and hydrogen induced cracking (HIC) susceptibility were studied via electrochemical techniques in accord with NACE TM 0284-2016 standard. The results showed that corrosion rate of X70MOS steel with Mg-addition was lower than both that without Mg-addition and X70 submarine pipeline steel by 14.3% and 73.3% respectively in NACE A solution, and decreased by 52.8% and 80.4% respectively in 3.5% NaCl solution. The HIC susceptibility of the Mg-alloyed experimental steel with finely dispersed inclusions was lower than that of X70MOS steel without Mg-addition and X70 submarine pipeline steel. The development of X70MOS steel with 0.003% Mg-addition can enhance the corrosion resistance of the designed steel.

Key words： X70MOS steel Mg-treatment composition design corrosion resistance

收稿日期: 2020-10-27

ZTFLH:

TG174

基金资助:国家自然科学基金(51871172);中央引导地方科技发展专项(2018ZYYD026)

通讯作者: 黄峰 E-mail: huangfeng@wust.edu.cn

Corresponding author: HUANG Feng E-mail: huangfeng@wust.edu.cn

作者简介: 郎丰军，男，1984年生，博士生

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引用本文:

郎丰军, 黄峰, 徐进桥, 李利巍, 岳江波, 刘静. Mg处理X70级抗酸性海底管线钢 (X70MOS) 成分设计及耐蚀性能研究[J]. 中国腐蚀与防护学报, 2021, 41(5): 617-624.
Fengjun LANG, Feng HUANG, Jinqiao XU, Liwei LI, Jiangbo YUE, Jing LIU. Composition Design and Corrosion Resistance of Mg Microallyed X70 Grade Acid Resistant Submarine Pipeline Steel (X70MOS). Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 617-624.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.213 或 https://www.jcscp.org/CN/Y2021/V41/I5/617

图1 电化学测试系统

图2 试样尺寸 (mm) 及观察截面示意图

图3 合金元素添加量与X70海底管线钢腐蚀速率关系曲线

表1 3种钢主要化学成分

表2 3种钢力学性能

图4 3种钢金相组织及钢夹杂照片

图5 3种钢夹杂物类型、数量、尺寸统计

图6 3种钢在不同腐蚀介质中动电位极化曲线

表3 极化曲线Tafel活性区拟合参数及计算得腐蚀速率

图7 3种钢在不同腐蚀介质中的Nyquist曲线及拟合电路

表4 3种钢的Nyquist曲线拟合参数

图8 HIC试样宏观表面形貌

图9 氢鼓泡下截面形貌图及能谱图

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