Acta Metallurgica Sinica (English Letters) >

2010 , Vol. 23 >Issue 6: 416 - 430

DOI: https://doi.org/10.11890/1006-7191-106-416

Research paper

Corrosion behavior of pure zinc and its alloy under thin electrolyte layer

  • CAO Fa-He ,
  • ZHENG Li-Yun ,
  • LIU Wen-Juan ,
  • GU Bing-Li ,
  • ZHANG Jian-Qing
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  • 1) Department of Chemistry, Zhejiang University, Hangzhou 310027, China
    2) State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received date: 2010-06-22

  Revised date: 2010-08-13

  Online published: 2010-12-14

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Abstract

The corrosion behavior of zinc and its alloy under thin electrolyte layers (TEL) in 0.1M NaCl solution was investigated by cathodic polarization curves and EIS. There was only one phase in pure zinc while zinc alloy consisted of eutectic phase and primary phase. Corrosion rate of zinc alloy was faster than that of pure zinc due to the effect of the micro-galvanic couples between the primary phase and the eutectic phase. The results indicated that corrosion rate of zinc alloy was greatly enhanced under TEL than that in bulk solution. Pure zinc exhibited minimum corrosion resistance as TEL decreased to 198 μm. Zinc and its alloy exhibited localized corrosion under TEL while it was more uniform in bulk solution. There were two capacitive loops in high frequency (HF) and middle frequency (MF) respectively, with finite length diffusion in low frequency (LF) presented in EIS. For pure zinc under TEL below 300 μm an additional inductive loop presented in MF-LF. The corrosion products and morphology were respectively examined by X-ray diffraction (XRD), FTIR (Fourier Transform Infra Red) and SEM-EDS. FTIR micro spectroscopy results indicated that the component of the corrosion products was similar at different section of the specimen surface but different in content.

Key words： Thin electrolyte layers; EIS; Cathodic polarization; FTIR micro spectroscopy; SEM

Cite this article

CAO Fa-He , ZHENG Li-Yun , LIU Wen-Juan , GU Bing-Li , ZHANG Jian-Qing . Corrosion behavior of pure zinc and its alloy under thin electrolyte layer[J]. Acta Metallurgica Sinica (English Letters), 2010 , 23(6) : 416 -430 . DOI: 10.11890/1006-7191-106-416

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