应变作用下Q235碳钢在NaHCO<sub>3</sub>+NaCl溶液中的孔蚀行为

doi:10.11902/1005.4537.2015.084

中国腐蚀与防护学报

2016, Vol. 36

Issue (3): 238-244 DOI: 10.11902/1005.4537.2015.084

研究报告

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应变作用下Q235碳钢在NaHCO₃+NaCl溶液中的孔蚀行为

李阳恒,左禹(

),唐聿明,赵旭辉

北京化工大学材料科学与工程学院北京 100029

Pitting Corrosion Behavior of Q235 Carbon Steel in NaHCO₃+NaCl Solution under Strain

Yangheng LI,Yu ZUO(

),Yuming TANG,Xuhui ZHAO

School of Materials Science and Engneering, Beijing University of Chemical Technology, Beijing 100029, China

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摘要:

用动电位极化、EIS和XPS等方法研究了应变作用下Q235碳钢在NaHCO₃+NaCl溶液中的孔蚀行为。结果表明：在0.2 molL^-1 NaHCO₃+0.01 molL^-1 NaCl溶液中,与无应变试样相比,8%的应变导致Q235碳钢的孔蚀电位E_b升高;随溶液Cl^-浓度升高,应变试样的E_b逐渐降低,当Cl^-浓度增大到0.1 molL^-1时,应变试样的E_b值降低到与无应变试样相同的水平。另一方面,应变导致Q235钢钝化膜中Fe³⁺/Fe²⁺比值减小,膜阻抗降低,电荷转移电阻变小,钝化膜的稳定性有所降低。在实验条件下应变导致E_b升高的现象归因于溶液中HCO₃^-的存在,应变促进钢表面的阳极溶解,进而促进了HCO₃^-在表面的优先吸附,一定程度上抑制了Cl^-促进孔蚀的作用。随溶液中HCO₃^-/Cl^-的比值降低,应变导致的E_b值变化逐渐减小直至消失。

关键词 ： Q235钢, 孔蚀, 应变, HCO3-, 钝化膜

Abstract：

The effect of strain on the pitting behavior of Q235 carbon steel in solutions of NaHCO₃+NaCl was studied by means of potentiodynamic polarization measurement, EIS and XPS. The results show that in a solution of 0.2 molL^-1 NaHCO₃+0.01 molL^-1 NaCl, a strain of 8% leads to an obvious increase of the pitting potential E_b of Q235 steel, but as the Cl^- concentration increased, the difference between the E_b values of strain and strain free samples decreased. When the Cl^- concentration increased to 0.1 molL^-1, the difference of E_b values disappeared. Besides, strain caused lower impedance, smaller charge transfer resistance R_ct and decreased the ratio Fe³⁺/Fe²⁺ in the passive film, thereby reduced the stability of passive film. The phenomenon that strain caused the increase of E_b was attributed to that the strain promoted the anodic dissolution of Fe which in turn promoted the preferential adsorption of HCO₃^- on the surface, as the result the harmful effect of Cl^- on the passive film was inhibited. As the ratio HCO₃^-/Cl^- in the solution decreased, the effect of HCO₃^- decreased and finally disappeared.

Key words： Q235 steel pitting corrosion strain HCO3- passive film

收稿日期: 2015-05-11

基金资助:国家自然科学基金项目 (51171014和51210001) 资助

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引用本文:

李阳恒,左禹,唐聿明,赵旭辉. 应变作用下Q235碳钢在NaHCO₃+NaCl溶液中的孔蚀行为[J]. 中国腐蚀与防护学报, 2016, 36(3): 238-244.
Yangheng LI, Yu ZUO, Yuming TANG, Xuhui ZHAO. Pitting Corrosion Behavior of Q235 Carbon Steel in NaHCO₃+NaCl Solution under Strain. Journal of Chinese Society for Corrosion and protection, 2016, 36(3): 238-244.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.084 或 https://www.jcscp.org/CN/Y2016/V36/I3/238

表1 Q235碳钢与304不锈钢的化学成分

图1 拉伸试样图示

图2 拉伸装置及测试仪器图

图3 在0.01 molL-1 NaCl+0.2 molL-1 NaHCO3溶液中无应变与8%应变的Q235钢试样的动电位极化曲线

图4 无应变和8%应变下Q235碳钢在不同Cl-浓度下的平均Eb及其分布

图5 在3.5%NaCl溶液和3.5%NaCl+0.3 molL-1 NaHCO3溶液中无应变与8%应变条件下304不锈钢试样的动电位极化曲线

图6 无应变和8%应变的Q235碳钢试样慢速动电位极化扫描至40 mV后在含0.2 molL-1 NaHCO3 的0.01 molL-1 NaCl溶液体系中的电化学阻抗谱

表2 无应变和8%应变Q235碳钢试样在慢速动电位极化扫描至40 mV后在含0.2 molL-1 NaHCO3的0.01 molL-1 NaCl溶液体系中的等效电路元件拟合值

图7 无应变的Q235碳钢试样在0.01 molL-1 NaCl+0.2 molL-1 NaHCO3溶液中慢速动电位极化扫描至40 mV (SCE) 后,其钝化膜表面的Fe2p和O1s XPS峰

图8 8%应变的Q235碳钢试样在0.01 molL-1 NaCl+0.2 molL-1 NaHCO3溶液中慢速动电位极化扫描至40 mV (SCE) 后,其钝化膜表面的Fe2p和O1s XPS峰

表3 Q235碳钢钝化表面的Fe2p峰拟合后的各物质含量

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