多介质在碳钢腐蚀过程中的协同作用

doi:10.11901/1005.3093.2021.004

材料研究学报

2021, Vol. 35

Issue (10): 721-731 DOI: 10.11901/1005.3093.2021.004

研究论文

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多介质在碳钢腐蚀过程中的协同作用

张少华¹, 李彦睿¹, 卫英慧¹^,²(

), 刘宝胜¹, 侯利锋², 杜华云², 刘笑达²

^1.太原科技大学材料科学与工程学院太原 030024
^2.太原理工大学材料科学与工程学院太原 030024

Synergistic Effect of Multi-media on Carbon Steel Corrosion

ZHANG Shaohua¹, LI Yanrui¹, WEI Yinghui¹^,²(

), LIU Baosheng¹, HOU Lifeng², DU Huayun², LIU Xiaoda²

^1.College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
^2.College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

引用本文:

张少华, 李彦睿, 卫英慧, 刘宝胜, 侯利锋, 杜华云, 刘笑达. 多介质在碳钢腐蚀过程中的协同作用[J]. 材料研究学报, 2021, 35(10): 721-731.
Shaohua ZHANG, Yanrui LI, Yinghui WEI, Baosheng LIU, Lifeng HOU, Huayun DU, Xiaoda LIU. Synergistic Effect of Multi-media on Carbon Steel Corrosion[J]. Chinese Journal of Materials Research, 2021, 35(10): 721-731.

全文: PDF(21679 KB) HTML

摘要:

采用电化学方法(电化学阻抗和动电位极化)并配合浸泡失重法以及一系列表征，研究了常温下碳钢基体与CO₂-Cl^-的界面反应，以及加入HCO₃^-介质后CO₂-Cl^--HCO₃^-体系中HCO₃^-介质对碳钢表面的成膜。结果表明，CO₂介质的加入使碳钢基体的溶解速率显著提高但是对Cl^-浓度的影响较小；添加高浓度的Cl^-反而抑制CO₂的溶解而使基体的腐蚀速率略微降低；在CO₂+Cl^-+HCO₃^-体系中加入微量的HCO₃^-后碳钢表面成膜不明显，疏松的腐蚀产物不能抑制碳钢基体的进一步溶解；浓度过高的HCO₃^-使FeCO₃的过饱和度提高从而加速细小晶体的析出，抑制腐蚀的进行。

关键词 ：金属材料, 多介质协同作用, 电化学技术, 腐蚀机理

Abstract：

The interfacial reaction between carbon steel and CO₂-Cl^-, along with the effect of HCO₃^- on the formation of corrosion products scale on the steel in the solution of CO₂-Cl^--HCO₃^- at room temperature were investigated via electrochemical impedance spectroscopy and potentiodynamic polarization measurement. The results show that the addition of CO₂ significantly increases the dissolution rate of carbon steel, whereas affects the Cl^-concentration little and that, the addition of Cl^- with high concentration can inhibit the dissolution of CO₂, leading to a slight decrease in the corrosion rate of carbon steel. The formation of corrosion products film on the surface of carbon steel is not obvious after adding a small amount of HCO₃^- in the solution, correspondingly the formation of loose corrosion products cannot inhibit the further dissolution of carbon steel; However, excessive HCO₃^- addition may accelerate the precipitation of fine crystallites by increasing the supersaturation of FeCO₃, and thus inhibiting the corrosion process.

Key words： metallic materials synergistic effect of multi-media electrochemical techniques corrosion mechanism

收稿日期: 2021-01-12

ZTFLH:

TE988

基金资助:国家自然科学基金(52071227);中央引导地方科技发展专项(YDZX20181400002967);山西省科技重大专项(20191102004);山西省重点研发计划(201805D121003)

作者简介: 张少华，男，1992年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.004 或 https://www.cjmr.org/CN/Y2021/V35/I10/721

表1 实验用20碳钢的化学成分

图1 20碳钢的显微组织和区域A/B的EDS结果

图2 浸泡实验系统

图3 碳钢在25℃的0.2/1.0 mol/L Cl-和0.2/1.0 mol/L Cl-+CO2(1 bar)溶液体系中的动电位极化曲线、Nyquist图和相应的等效电路

图4 碳钢在Cl-和Cl-+CO2 (1 bar) 溶液体系中的动电位极化曲线拟合结果以及相应的腐蚀电流密度和腐蚀速率

表2 碳钢在0.2/1.0 mol/L Cl-和0.2/1.0 mol/L Cl-+CO2(1 bar)溶液体系中电化学阻抗谱的拟合参数

图5 碳钢在25℃的0.2/1.0 mol/L Cl-和0.2/1.0 mol/L Cl-+CO2(1 bar)溶液体系中浸泡24 h后的表面形貌以及EDS/XRD结果

图6 碳钢在60℃的CO2 (1 bar)+0.1 mol/L Cl-+0/0.05/0.1/0.5 mol/L HCO3-溶液体系中的动电位极化曲线和阻抗图

表3 碳钢在CO2 (1 bar)+0.1 mol/L Cl-+0/0.05/0.1/0.5 mol/L HCO3-溶液体系中所得动电位极化曲线的拟合参数值

表4 碳钢在CO2(1 bar)+0.1 mol/L Cl-+0/0.05/0.1/0.5 mol/L HCO3-溶液体系中的电化学阻抗谱拟合参数

图7 碳钢在60℃的CO2(1 bar)+0.1 mol/L Cl-+0、0.05、0.1和0.5 mol/L HCO3-溶液体系中的循环伏安曲线

图8 碳钢在60℃的CO2 (1 bar)+0.1 mol/L Cl-+0、0.05、0.1和0.5 mol/L HCO3-溶液体系中极化到1.25 V vs. SCE的SEM形貌

图9 碳钢在60℃的CO2 (1 bar)+0.1 mol/L Cl-+0、0.05、0.1和0.5 mol/L HCO3-溶液体系中浸泡24 h后的表面SEM照片

图10 碳钢在60℃的CO2 (1 bar)+0.1 mol/L Cl-+0、0.05、0.1和0.5 mol/L HCO3-溶液体系中浸泡24 h后的横截面SEM照片

图11 碳钢在60℃的CO2 (1 bar)+0.1 mol/L Cl-+0.05/0.5 mol/L HCO3-溶液体系中浸泡24 h后腐蚀产物的XRD谱

图12 碳钢在60℃的CO2 (1 bar)+0.1 mol/L Cl-+0/0.05/0.1/0.5 mol/L HCO3-溶液体系中浸泡24 h后的Nyquist曲线

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