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中国腐蚀与防护学报  2018, Vol. 38 Issue (2): 158-166    DOI: 10.11902/1005.4537.2017.043
  研究报告 本期目录 | 过刊浏览 |
X70钢及其焊缝在Na2CO3+NaHCO3溶液中电化学腐蚀行为研究
廖梓含, 宋博, 任泽, 何川, 陈旭()
辽宁石油化工大学石油天然气工程学院 抚顺 113001
Electrochemical Corrosion Behavior of Matrix and Weld Seam of X70 Steel in Na2CO3+NaHCO3 Solutions
Zihan LIAO, Bo SONG, Ze REN, Chuan HE, Xu CHEN()
School of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China
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摘要: 

采用动电位极化、电化学阻抗谱和Mott-Schottky方法研究了溶液浓度和Cl-对X70钢母材及其焊缝在Na2CO3+NaHCO3溶液中电化学腐蚀行为影响。结果表明,X70钢母材和焊缝在0.1~1.0 mol/L (Na2CO3+NaHCO3) 溶液中都能形成稳定的钝化区间。随着溶液浓度的增大,钝化膜的稳定性增加。X70管线钢母材和焊缝的钝化膜均呈现出n型半导体特征,且施主密度与维钝电流密度的变化趋势相同。Cl-在1.0 mol/L (Na2CO3+NaHCO3) 溶液中,对焊缝组织的吸附现象存在显著特征,主要吸附于氧空位处。
关键词 ： X70管线钢,  溶液浓度,  钝化膜,  焊缝,  缺陷密度    
Abstract：

The electrochemical corrosion behavior of the matrix and weld seam of X70 steel in Na2CO3+NaHCO3 solution was studied by means of potentiodynamic polarization, electrochemical impedance spectroscopy and Mott-Schottky technique. Results showed that the passive film could form on both the matrix and weld seam of X70 steel in solutions with the concentration of Na2CO3+NaHCO3 within a range of 0.1~1.0 mol/L. The stability of passive films increased with the concentration of Na2CO3+NaHCO3. The passive films form on both the matrix and weld seam of X70 steel behave as a n-type semiconductor, the donor density follows the same trend as the passivity current density. There is a notable feature that the Cl- adsorbed onto the oxygen vacancies on the weld seam in the solution of 1 mol/L carbonate/bicarbonate.
Key words： X70 pipeline steel    solution concentration    passive film    weld seam    defects density
收稿日期: 2017-03-17     
基金资助:国家自然科学基金 (51574147) 和辽宁省教育厅发展基金 (L2017LZD004)
作者简介:

作者简介 廖子涵,女,1990年生,硕士生
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廖梓含, 宋博, 任泽, 何川, 陈旭. X70钢及其焊缝在Na2CO3+NaHCO3溶液中电化学腐蚀行为研究[J]. 中国腐蚀与防护学报, 2018, 38(2): 158-166.
Zihan LIAO, Bo SONG, Ze REN, Chuan HE, Xu CHEN. Electrochemical Corrosion Behavior of Matrix and Weld Seam of X70 Steel in Na2CO3+NaHCO3 Solutions. Journal of Chinese Society for Corrosion and protection, 2018, 38(2): 158-166.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.043      或      https://www.jcscp.org/CN/Y2018/V38/I2/158

Zone C Si Mn S Si Cr Al V Mo Cu P Ni Fe
Metal 0.045 0.24 0.48 0.010 0.004 0.031 0.01 0.005 0.25 0.015 0.017 0.160 Bal.
Weld 0.075 0.29 1.31 0.004 0.004 0.045 --- --- 0.03 0.035 0.014 0.016 Bal.
表1  X70钢及其焊缝化学成分
图1  X70母材及焊缝金相显微组织
图2  X70钢母材和焊缝在无Cl-的高pH值溶液中的极化曲线
Zone Concentration / molL-1 Ecorr / V(SCE) Ec1 / V(SCE) Eb / V(SCE) Ic / mAcm-2 Ip / μAcm-2
Metal 0.1 -0.83 -0.67 0.86 0.148 1.44
0.5 -0.87 -0.68 0.86 0.257 1.07
1.0 -0.87 -0.68 0.86 0.562 1.07
Weld seam 0.1 -0.79 -0.67 0.83 0.412 5.93
0.5 -0.86 -0.67 0.84 0.173 6.06
1.0 -0.86 -0.64 0.85 1.172 11.48
表2  X70钢在无Cl-的高pH值溶液中极化曲线拟合结果
图3  X70钢母材和焊缝在含Cl-的高pH值溶液中的极化曲线
Zone NaHCO3+Na2CO3 / molL-1 Rf / V(SCE) Ec1 / V(SCE) Eb / V(SCE) Ic / mAcm-2 Ip / μAcm-2
Metal 0.1 -0.79 -0.74 0.012 0.105 31.60
0.5 -0.85 -0.69 0.869 0.457 14.80
1.0 -0.87 -0.65 0.853 0.513 10.10
Weld seam 0.1 -0.81 -0.66 -0.010 0.132 6.66
0.5 -0.85 -0.69 0.860 0.457 14.12
1.0 -0.88 -0.72 0.780 5.400 8.70
表3  X70钢在含Cl-的高pH值溶液中极化曲线拟合结果
图4  X70钢母材和焊缝在无Cl-的高pH值溶液中的EIS
图5  X70钢母材和焊缝在含Cl-的高pH值溶液中的EIS
图6  X70钢在高pH值溶液中EIS的等效电路
Zone NaHCO3+Na2CO3molL-1 NaClmolL-1 RsΩcm-2 Qf104 Fcm-2 n RfΩcm-2 Qdl104 Fcm-2 n RctΩcm-2 w
Matel 0.1 0 3.12 1.74 0.07 357.8 31.60 0.40 450.1 ---
0.5 0 5.84 2.27 0.87 366.7 10.90 0.39 515.1 ---
1.0 0 18.96 3.77 0.81 822.4 26.56 0.58 1005.6 ---
0.1 0.05 3.43 1.02 0.41 105.7 2.13 0.57 376 0.034
0.5 0.05 4.17 1.33 0.82 343.0 3.0 1 683.3 ---
1.0 0.05 8.45 3.04 0.49 498.5 3.30 0.87 908.1 ---
Weld seam 0.1 0 3.62 9.85 0.38 0.061 2.57 0.87 449.3 ---
0.5 0 6.68 1.75 0.86 106.8 6.76 0.36 498.8 ---
1.0 0 23.58 2.65 0.84 404.8 22.49 0.55 982.5 ---
0.1 0.05 1.67 2.65 0.74 60.2 4.87 0.56 345.1 0.243
0.5 0.05 5.05 1.15 0.92 123.8 5.44 0.96 520.2 ---
1.0 0.05 8.43 3.02 0.41 369.8 3.29 0.72 891.9 ---
表4  X70钢在高pH值溶液中电化学阻抗拟合结果
图7  X70钢母材和焊缝在高pH值溶液中的M-S曲线
图8  母材和焊缝施主密度ND与Ip的变化关系图
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