采用旋转挂片和SEM，EDS及IR分析研究Q235钢在海水淡化一级反渗透产水中（RO）的腐蚀速度和腐蚀产物变化规律，并利用动电位扫描、电化学阻抗法研究腐蚀过程及腐蚀反应控制步骤。结果表明，Q235钢在海水淡化一级反渗透产水中腐蚀速度在48h内迅速增大至1．4mm／a，其后保持稳定。锈层初期为，γ—FeOOH薄层，随时间延长逐渐转为由Fe304构成的内锈层及由γ-FeOOH和Q-FeOOH构成的外锈层。腐蚀过程受阴极控制，初期腐蚀阻力达到最大，其后由于大量γ-FeOOH在酸性条件下极易转化为对腐蚀反应没有阻滞作用的Fe304，腐蚀阻力迅速减小，腐蚀速度迅速增大，当Q235钢表面γ-FeOOH生成和转化达到平衡后，腐蚀阻力保持稳定，腐蚀速度也不再发生变化。
The corrosion behavior of Q235 steel in seawater reverse osmosis permeate(RO) was investigated by rotation coupon method, SEM, IR and XRD, and electrochemical tests were used for studying the control step and electrode process of corrosion reaction. Experimental results showed that the corrosion rate was speeded up in first 48 h and maintained at 1.4 mm/a afterwards. Initial rust layer was formed by a thin layer of γ-FeOOH, and with time passing by, it transformed to a double-layer structure with inner thick Fe3O4 layer and outer a-FeOOH/γ-FeOOH layer. Corrosion process was controlled by cathodic reaction, resistance of which reached peak in initial stage, then reduced rapidly because of conversion of γ-FeOOH to Fe3O4, which provided no inhibition of corrosion and caused high corrosion rate of Q235 steel. As the generation and conversion of γ-FeOOH reached equilibrium on the surface of Q235 steel, corrosion resistance and corrosion rate kept steady.
参考文献
| [1] | 韦存忠,沈隼睿.膜法海水淡化技术在玉环电厂的应用[J].电力科技与环保,2010(05):48-49. |
| [2] | 李敬,刘贵昌,王玮,章强,易桂虎.碳钢在反渗透水中耐蚀性研究[J].广州化工,2009(04):95-97. |
| [3] | 邹妍,郑莹莹,王燕华,王佳.低碳钢在海水中的阴极电化学行为[J].金属学报,2010(01):123-128. |
| [4] | 谢颖,李瑛,孙挺,王福会.原位生长的纯γ-FeOOH和α-FeOOH锈膜对Q235钢保护性能的研究[J].科学通报,2008(23):2848-2855. |
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