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| Electrochemical Properties of Micro Area of 5083 Aluminum Alloy in 3%NaCl Solution |
| Received:May 26, 2016 Revised:August 15, 2016 |
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| DOI：10.7643/ issn.1672-9242.2016.04.002 |
| KeyWord:5083 aluminum alloy SVET Corrosion Occurrence mechanism |
| Author | Institution |
| LI Liang-cheng |
College of Science, Navy University of Engineering, Wuhan , China |
| KONG Xiao-dong |
College of Science, Navy University of Engineering, Wuhan , China |
| LI Xi |
College of Science, Navy University of Engineering, Wuhan , China |
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| Abstract: |
| Objective To further explore the corrosion behavior of 5083 aluminum alloy in seawater environment. Methods Under the condition of 3%NaCl solution, we measured the micro region of 5083 aluminum alloy by scanning vibrating electrode technique (SVET), obtained the change of potential gradient in the surface area, and studied the occurrence and development mechanism of corrosion of 5083 aluminum alloy by combining AC impedance spectroscopy, Scanning electron microscopy and energy spectrum analysis. Results The results showed that due to the segregation of elements such as Zn and S in the process of corrosion, the surrounding area of the second phase including inclusions was dissolved first, which caused the aluminum alloy matrix to be exposed in the solution, and formed pitting when the reaction continued, and corrosion current led to higher potential of the corrosion area than that of the matrix. When soaked for 3 h, the maximum potential difference was 15.72 mV, and when soaked for 5 h, the maximum potential difference reached 20.06 mV. Conclusion In seawater environment, the surrounding area of the inclusion of 5083 aluminum alloy was dissolved with priority, followed by the second phase with higher potential than the matrix potential, at the same time, the area with damaged passivation film was also corroded, and finally these areas formed pitting. |
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