Corrosion Behavior of Zinc Exposed to Salt Lake Area for 48 Months

doi:10.11901/1005.3093.2018.492

Chinese Journal of Materials Research

2019, Vol. 33

Issue (8): 603-613 DOI: 10.11901/1005.3093.2018.492

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Corrosion Behavior of Zinc Exposed to Salt Lake Area for 48 Months

Dan ZHANG,Zhenyao WANG(

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Institute of Metals Research, Chinese Academy of Sciences, Shenyang 110016, China

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Dan ZHANG,Zhenyao WANG. Corrosion Behavior of Zinc Exposed to Salt Lake Area for 48 Months. Chinese Journal of Materials Research, 2019, 33(8): 603-613.

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Abstract

Corrosion behavior of zinc was field exposed to salt-rich arid atmosphere at Qinghai salt lake of Qinghai province at the Northwest China for 48 months was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), metalloscopy and EIS techniques.Results reveal that the corrosion kinetics of zinc in the atmosphere at a selected site followed the empirical equation m=Atⁿ. The corrosion of zinc on the skyward surface is heavier than that on the fieldward one, while spallation of the rust layer on the skyward surface did occur after exposure for 48 months. The corrosion products on the two surfaces were mainly composed of Zn₅(OH)₈Cl₂·H₂O, Zn₅(CO)₃(OH)₆, Zn₄SO₄(OH)₆·3H₂O, the rust layer contained also certain amount of SiO₂. The results of EIS analysis showed that the rust layer could suppress the corrosion of zinc substrate, the corrosion resistance of rust layers on the two surfaces increased with time, then the protectiveness of the rust layer on the skyward surface was weakened for 48 months exposure.

Key words: materials failure and proterction zinc Qinghai salt lake atmospheric corrosion the skyward surfaces EIS

Received: 13 August 2018

ZTFLH:

TG172.3

Fund: Supported by National Science Foundation of China(No. 51671197);Supported by National Science Foundation of China(No. 51601199);Guangzhou Industry-university-research Collaborative Innovation Alliance Special Project(No. 201604046014)

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.492 OR https://www.cjmr.org/EN/Y2019/V33/I8/603

Fig.1 Curve of mass loss vs test time for zinc

Fig.2 The skyward macro appearances of zinc after exposure for 6 (a), 12 (b), 24 (c) and 48 months (d), and the field-ward macro appearances for 6 (a'), 12 (b'), 24 (c') and 48 months (d')

Fig.3 Skyward surface appearances of zinc after exposure for 6 (a), 12 (b), 24 (c) and 48 months (d), and the field-ward surface appearances for 6 (a'), 12 (b'), 24 (c') and 48 months (d')

Fig.4 XRD patterns of zinc (the skyward one (a) and the field-ward one (b)) after exposure

Fig.5 Skyward cross section morphologies of corrosion product layer of zinc after exposure for 6 (a), 12 (b), 24 (c) and 48 months (d), and the field-ward cross section morphologies of corrosion product layer of zinc for 6 (a'), 12 (b'), 24 (c') and 48 months (d')

Table 1 EDS results of elements at different positions shown in Fig.5

Fig.6 The skyward cross section morphologies of corrosion product layer of zinc without corrosion products after exposure for 6 (a), 12 (b), 24 (c) and 48 months (d), and the field-ward cross section morphologies of corrosion product layer of zinc for 6 (a'), 12 (b'), 24 (c') and 48 months (d')

Fig.7 Nyquist of zinc corroded for different exposure time, (a) the skyward one, (b) the field-ward one

Fig.8 Bode of zinc corroded for different exposure time (a) the skyward one, (b) the field-war one

Fig.9 Equivalent circuit of EIS of zinc

Table 2 Fitted EIS parameters of zinc

Fig.10 EIS parameters of R_p as function of exposure time

Fig.11 Corrosion process schematic diagrams of zinc during exposure in Qinghai Salt Lake atmosphere

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