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| CORROSION BEHAVIOR OF ALUMINIUM ALLOYS AFTER CYCLIC WET-DRY IMMERSION TEST IN 0.02 mol/L NaHSO3 SOLUTION |
| ZHOU Herong1;3;LI Xiaogang1;2;DONG Chaofang1;MA Jian3;LU Qikai3;FENG Hao3 |
1.Corrosion and Protection Center;University of Science and Technology Beijing; Beijing 100083
2.Beijing Key Laboratory for Corrosion; Erosion and Surface Technology; University of Science and Technology Beijing; Beijing 100083
3.State Key Laboratory of Environmental Adaption for Industrial Products; China National Electric Apparatus Research Institute; Guangzhou 510063 |
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Abstract The corrosion behaviors of aluminium alloys 1060，2A12 and 7A04 under cyclic wet-dry immersion conditions have been investigated in 0.02 mol/L sodium sulfite solution by the mass loss method and electrochemical impedance spectroscopy （EIS）. Scanning electron microscopy （SEM） was used to observe the surface morphology； energy dispersive X-ray detector （EDX） and X-ray photoelectron spectroscopy （XPS） were employed to analyze the corrosion products. We also tested the mechanical capability of experimental materials. The results showed that corrosion product was increasing with testing hours prolonging, mass loss adding, strength and elongation percentage declining. Surface observation revealed that corrosion product was agglomerated and accidented, extending forth. The main corrosion product is alumina and aluminium sulfate hydrate. The results of EIS indicated that corrosion rate is highest in 360 hour. Corrosion resistance of aluminium 1060 was best in 0.02 mol/L sodium sulfite solution, but that of aluminium alloy 7A04 was worst.
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Received: 28 March 2007
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Corresponding Authors:
ZHOU Herong
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