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pH值對Q235碳鋼與304L不銹鋼在典型含硫環境中電偶腐蝕行為的影響

Effect of pH value on the galvanic corrosion behaviour of Q235-304L couples in sulfur environment

  • 摘要: 采用電化學法和浸泡法研究了Q235碳鋼與304L不銹鋼在典型含硫環境中的電偶腐蝕行為。采用SEM觀察試樣表面形貌。結果表明:在實驗體系中304L的陰陽極過程均為電化學活化步驟控制;在pH為4和7的實驗溶液中,Q235鋼的陰陽極過程均受電化學活化控制;而在pH=13.3的實驗溶液中,Q235陰極過程受電化學過程控制,陽極過程受離子擴散控制。在三種實驗溶液中的電偶腐蝕效應隨陰陽極面積比的增大而增大,但電偶電流隨陰陽極面積比的變化并不呈現出對數正比規律。隨著溶液pH值的升高,Q235鋼的電偶腐蝕速率明顯減小,但電偶腐蝕效應變化不明顯。

     

    Abstract: The galvanic behaviour of a Q235-304L couple was studied by the electrochemical method and immersion test. Surface morphologies of the samples were observed by SEM after rust cleaning. The results showed that both the cathodic and anodic processes of 304L were controlled by the electrochemical activation step in all the three solutions with pH values of 4.0, 7.0 and 13.3, and both the cathodic and anodic processes of Q235 in the solutions with pH values of 4.0 and 7.0 were controlled by the electrochemical step, while the anodic process of Q235 exhibited an apparent characteristics of diffusion control when the pH value of the solution was 13.3. As the area ratio increases, the galvanic effect increased in all the three solutions accordingly, but the correlation between the galvanic current and the cathode/anode area ratio did not accord to the rule of logarithm. With the elevation of pH value, the galvanic corrosion rate of Q235 would greatly decrease, but the change of the galvanic effect was not so obvious.

     

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