ZHOU Herong, LI Xiaogang, DONG Chaofang, XIAO Kui, FENG Hao. Corrosion of aluminum alloy 7A04 under thin electrolyte layers[J]. Chinese Journal of Engineering, 2008, 30(8): 880-887. DOI: 10.13374/j.issn1001-053x.2008.08.007
Citation: ZHOU Herong, LI Xiaogang, DONG Chaofang, XIAO Kui, FENG Hao. Corrosion of aluminum alloy 7A04 under thin electrolyte layers[J]. Chinese Journal of Engineering, 2008, 30(8): 880-887. DOI: 10.13374/j.issn1001-053x.2008.08.007

Corrosion of aluminum alloy 7A04 under thin electrolyte layers

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  • Received Date: July 09, 2007
  • Revised Date: August 31, 2007
  • Available Online: August 05, 2021
  • ABSTRACT The corrosion behavior of 7A04 aluminum alloy in 1 mol· L-1 sodium sulfate solution was investigated by a thin electrolyte layer equipment. The surface morphology was observed by scanning electron microscope (SEM). The corrosion products were analyzed by energy dispersive X-ray detector (EDX) and X-ray photoelectron spectroscopy (XPS). The electrochemical character of 7A04 aluminum alloy was studied by electrochemical impedance spectroscopy (EIS). It is shown that the corrosion is not uniform, and the corrosion product at the edge is more than that at the center. The corrosion products of the specimen surface mainly are Al(OH)3 and aluminum sulfates. EIS measurements indicate that the corrosion rate of 7A04 aluminum alloy under the thin electrolyte layer of 110μm is the biggest in the initial stage (0~96 h). But in the later stage of corrosion (96~168 h), the corrosion rate in the bulk solution is the biggest.
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