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[目的]抑制接地纯锌在天津滨海地区的腐蚀现象。[方法]采用动电位极化曲线、电化学阻抗谱(EIS)和Mott-Schottky曲线测量技术，研究了木质素磺酸钠(SLS)浓度对Zn在盐碱土浸出液中腐蚀行为的影响，以及相关的等温吸附模型。[结果]SLS属于阴极缓蚀剂，随着其质量浓度在0～60 mg/L范围内增加，Zn在盐碱土浸出液中的腐蚀电流密度逐渐减小，腐蚀电位逐渐正移，吸附膜电阻和极化电阻逐渐增大，电荷转移阻力增加，腐蚀速率减小，缓蚀率逐渐升高。Mott-Schottky曲线分析显示，Zn表面形成的吸附膜具有n型半导体性质。当SLS的质量浓度从0 mg/L增加到60 mg/L,Zn表面吸附膜的施主浓度逐渐减小，平带电位逐渐升高，吸附膜的半导体性质无明显改变，但缺陷浓度减小，材料耐蚀性提高。等温吸附式拟合结果显示，在添加不超过60 mg/L SLS的盐碱土浸出液中，SLS在Zn表面的吸附行为符合Langmuir等温吸附模型，属于物理吸附与化学吸附混合控制的自发过程。[结论]在添加量不超过60 mg/L的情况下，SLS在Zn表面通过自发的混合吸附方式有效地抑制了Zn在盐碱土浸出液中的腐蚀。
Abstract：[Objective] To inhibit the corrosion of pure zinc used for grounding purposes in the Tianjin Binhai New Area. [Method] The effect of sodium lignosulfonate(SLS) on the corrosion behavior of zinc in a saline-alkali soil leachate was examined by measuring potentiodynamic polarization curves, electrochemical impedance spectra(EIS), and Mott-Schottky curves. The relevant adsorption isotherm model was also studied. [Result] SLS acts as a cathodic inhibitor. As its mass concentration increased within the range of 0-60 mg/L, the corrosion current density of Zn in the saline-alkali soil leachate gradually decreased, while the corrosion potential shifted positively. The adsorption film resistance and polarization resistance gradually increased, leading to higher charge transfer resistance and a reduced corrosion rate, with the inhibition efficiency progressively rising. Mott-Schottky curve analysis revealed that the adsorption film formed on the Zn surface exhibited n-type semiconductor characteristics. When the SLS mass concentration was increased from 0 mg/L to 60 mg/L, the donor density of the adsorption film on the Zn surface gradually decreased, and the flat band potential gradually increased. The semiconducting nature of the adsorption film did not change significantly, but the defect concentration decreased, enhancing the material's corrosion resistance. Fitting of the adsorption isotherm showed that in the saline-alkali soil leachate with SLS additions up to 60 mg/L, the adsorption behavior of SLS on the Zn surface conformed to the Langmuir adsorption isotherm model. This adsorption was a spontaneous process controlled by a mix of physical and chemical adsorption. [Conclusion] At addition levels not exceeding 60 mg/L, SLS effectively inhibits the corrosion of Zn in the saline-alkali soil leachate through a spontaneous and mixed adsorption mechanism on the Zn surface.
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基本信息:
DOI：10.19289/j.1004-227x.2026.02.004
中图分类号:TG174.42
引用信息:
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