Effect of MgCl2 Deposite on Simulated Atmospheric Corrosion of Zn via Wet-dry Altertnating Corrosion Test

doi:10.11901/1005.3093.2019.188

Chinese Journal of Materials Research

2019, Vol. 33

Issue (9): 705-712 DOI: 10.11901/1005.3093.2019.188

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Effect of MgCl₂ Deposite on Simulated Atmospheric Corrosion of Zn via Wet-dry Altertnating Corrosion Test

YIN Qi^1,²,LIU Miaoran^1,³,LIU Yuwei¹,PAN Chen¹(

),WANG Zhenyao¹(

)

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
3. University of Chinese Academy of Sciences, Beijing 100049, China

Cite this article:

YIN Qi,LIU Miaoran,LIU Yuwei,PAN Chen,WANG Zhenyao. Effect of MgCl₂ Deposite on Simulated Atmospheric Corrosion of Zn via Wet-dry Altertnating Corrosion Test. Chinese Journal of Materials Research, 2019, 33(9): 705-712.

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Abstract

The effect of MgCl₂- and NaCl-deposit on simulated atmospheric corrosion of Zn was comparatively investigated via wet-dry alternating corrosion test, as well as mass loss, X-ray diffraction (XRD), scanning electron microscope equipped with energy dispersive spectrometer (SEM-EDS). The results show that the corrosion rate of Zn was significantly inhibited by the deposition of MgCl₂; the corrosion products formed on Zn plate with NaCl deposit were Zn₅(OH)₈Cl₂·H₂O、Zn₄CO₃(OH)₆·H₂O and Zn(OH)₂, while was only Zn₅(OH)₈Cl₂·H₂O for Zn plate with MgCl₂deposit. It was proposed that the corrosion may be caused by the decrease of pH, which was induced by the precipitation of Mg²⁺ions and OH^- ions, in the cathodic sites.

Key words: materials failure and protection atmospheric corrosion mechanism laboratory simulated corrosion test MgCl₂ zinc

Received: 09 April 2019

ZTFLH:

TG172.3

Fund: the National Natural Science Foundation of China(51671197);and Special Project of Chinese Academy of Sciences(XDA130040502)

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	Qi YIN
	Miaoran LIU
	Yuwei LIU
	Chen PAN
	Zhenyao WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.188 OR https://www.cjmr.org/EN/Y2019/V33/I9/705

Table 1 Elemental composition of the zinc samples in the experiments (mass fraction)

Fig.1 Thickness loss results of zinc with different salts deposited on after 528 h exposure

Fig.2 XRD patterns of the corroded zinc samples after 528 h exposure (a) Group Na; (b) Group Mg1 and Group Mg2

Table 2 XRD results of the corroded zinc samples after 528 h exposure

Fig.3 SEM-EDS results of the corroded zinc sample surfaces after 528 h exposure: (a) (b) (c) Group Na; (d) (e) (f) Group Mg1; (g) (h) (i) Group Mg2

Fig.4 SEM-EDS results of cross sections of the corroded zinc samples after 528 h exposure: (a) (d) (e) Group Na; (b) (f) Group Mg1; (c) (g) Group Mg2

Fig.5 SEM images of the zinc sample surfaces after removal of the corrosion products: (a) Group Na; (b) Group Mg1; (c) Group Mg2

Fig.6 Predominant diagram of the divalent zinc compounds in 4 mol·L^-1Cl^- solution at 25℃ and 1.013×10⁵ Pa with 350×10^-6 CO₂， the calculation was based on the equilibrium constant listed in Table 3 and the ionic strength was set as 0

Fig.7 pH value of the immersion solution of corroded zinc samples

Table 3 Reactions and equilibrium constants at ionic strength 0 at 25℃ and 1.013×10⁵ Pa

Fig.8 The shifting phenomenon of the corrosion product Zn₅(OH)₈Cl₂·H₂O formed on zinc samples

Table 4 Main peak position of Zn₅(OH)₈Cl₂·H₂O and Zn in the experimental groups

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