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| Galvanic Corrosion Behavior of Q345 Steel in Artificial Seawater with Different pH Values |
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| DOI：10.7643/issn.1672-9242.2023.06.008 |
| KeyWord:Q345 steel pH value seawater self-corrosion galvanic corrosion corrosion prevention |
| Author | Institution |
| HU Jie-zhen |
School of Mechanical Engineering, Guangdong Zhanjiang , China |
| LIU Wen-juan |
School of Mechanical Engineering, Guangdong Zhanjiang , China |
| DENG Pei-chang |
School of Chemistry and Environment, Guangdong Ocean University, Guangdong Zhanjiang , China |
| HUANG Huan |
School of Mechanical Engineering, Guangdong Zhanjiang , China |
| LIN Guo-dong |
School of Mechanical Engineering, Guangdong Zhanjiang , China |
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| Abstract: |
| The work aims to study the effect of galvanic corrosion on metals in artificial seawater environment with different pH values. Combined with macroscopic and microscopic corrosion morphology observation, the self-designed detachable electrode was used to analyze the galvanic corrosion behavior of Q345 steel in artificial seawater with different pH values by immersion method and electrochemical method. In the initial stage of immersion, the difference of potential difference between electrically connected electrodes in seawater with different pH values was small and galvanic corrosion was not easy to occur. After soaking for 14 days, the potential difference between the electrodes was quite different, indicating that obvious galvanic corrosion occurred between the different electrically connected electrodes. Compared with self-corrosion, the galvanic corrosion at pH 7.50 and 8.40 had higher corrosion potential, lower corrosion current density and higher corrosion film resistance (Rp), indicating that the corrosion between the electrically connected electrodes was mainly self-corrosion at pH 7.50 and 8.40, and obvious galvanic corrosion occurred between the electrically connected electrodes at pH 7.80 and 8.70. The corrosion products on the surface of the self-corrosion electrode were less, and the rust layer structure was loose. In galvanic corrosion, there were less corrosion products on the electrode surface at pH 7.50 and 8.40, and the rust layer structure was compact. The corrosion products on the electrode surface at pH 7.80 and 8.70 were more, and the rust layer structure was loose. By studying the difference between the two corrosion behaviors, the effect of different pH values on galvanic corrosion is analyzed, which provides data support for corrosion prevention of metallic materials in marine environment. |
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