Long-term monitoring of zinc corrosion behavior in typical hot and dry atmosphere environment in Turpan, China
Anti-Corrosion Methods and Materials
ISSN: 0003-5599
Article publication date: 14 August 2018
Issue publication date: 1 October 2018
Abstract
Purpose
This paper aims to investigate the corrosion behavior of zinc in a typical hot and dry atmosphere. It proposes the dynamic corrosion for different exposure periods. Results can provide the basic data and corrosion mechanism of zinc in such environment.
Design/methodology/approach
In this paper, the authors investigated the corrosion behavior of pure zinc exposed in the typical hot and dry environment in Turpan for one-four years, which has never been studied. Scanning electron microscopy, laser scanning confocal microscopy, electron probe micro-analyzer (EPMA), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) were conducted to measure the corrosion morphology and products of zinc. Finally, combining electrochemical impedance spectroscopy and scanning Kelvin probe techniques, the corrosion mechanism of zinc in Turpan was examined.
Findings
The thickness loss of the zinc followed an exponential law with respect to exposure time: D = 3.17 t0.61, and both of the rust layer resistance and the charge transfer resistance increased with exposure time. The corrosion products mainly comprised ZnO, Zn(OH)2, Zn5(CO3)2(OH)6, Zn4SO4(OH)6·5H2O and Zn12(SO4)3Cl3(OH)15·5H2O. The Kelvin potentials shifted toward the positive direction from −0.380 to −0.262 V (vs saturated calomel electrode [SCE]) when the exposure time extended from one to four years and the distribution of the corrosion products became more and more uniform.
Originality/value
The corrosion behavior of pure zinc in the typical hot and dry environment in Turpan has not been studied. The dynamic corrosion for different exposure periods was obtained. The corrosion products were systemically investigated via energy-dispersive X-ray spectroscopy, EPMA, XPS and XRD.
Keywords
Acknowledgements
This work was supported by the National Key Research and Development Program of China (No. 2017YFB 0702300), National Natural Science Foundation of China (No. 51671029) and Fundamental Research Funds for the Central Universities (No. FRF-TP-17-002B).
Citation
Kang, C., Kong, D., Yao, J., Guo, C., Wang, L., Xiao, K. and Dong, C.F. (2018), "Long-term monitoring of zinc corrosion behavior in typical hot and dry atmosphere environment in Turpan, China", Anti-Corrosion Methods and Materials, Vol. 65 No. 5, pp. 471-483. https://doi.org/10.1108/ACMM-06-2018-1948
Publisher
:Emerald Publishing Limited
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