Difference in Corrosion Behavior of Four Mg-alloys in Cl--NH4+-NO3- Containing Solution

doi:10.11902/1005.4537.2019.250

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (6): 553-559 DOI: 10.11902/1005.4537.2019.250

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Difference in Corrosion Behavior of Four Mg-alloys in Cl^--NH₄⁺-NO₃^- Containing Solution

YU Haoran, ZHANG Wenli, CUI Zhongyu(

)

School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

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Abstract

The effect of chemical composition and microstructure on the corrosion behavior of Mg-alloys AZ31, AZ91, AM60 and ZK61 in 0.1 mol/L sodium chloride solution (NaCl) containing different concentration of ammonium nitrate (NH₄NO₃) were investigated. The corrosion processes of the four Mg-alloys were studied by immersion tests, polarization curve measurement, SEM and CLSM. Results show that the addition of NH₄NO₃ accelerates the corrosion of the four alloys, whilst autocatalytic pitting corrosion occurs due to the synergistic effects of Cl^-, NH₄⁺, and NO₃^- in solutions within a specific concentration range. The corrosion resistance of different Mg-alloys is closely related to the chemical composition and microstructure of the alloys.

Key words: Mg-alloy ammonium autocatalytic pitting corrosion chemical composition microstructure

Received: 06 December 2019

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(51601182)

Corresponding Authors: CUI Zhongyu E-mail: cuizhongyu@ouc.edu.cn

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Cite this article:

YU Haoran, ZHANG Wenli, CUI Zhongyu. Difference in Corrosion Behavior of Four Mg-alloys in Cl^--NH₄⁺-NO₃^- Containing Solution. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 553-559.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.250 OR https://www.jcscp.org/EN/Y2020/V40/I6/553

Fig.1 Microstructures of AZ31 (a), AZ91 (b), AM60 (c) and ZK61 (d) alloys

Fig.2 Mass losses (a) and corrosion rates (b) of AZ31, AZ91, AM60, and ZK61 Mg-alloys during immersion for 12 h in 0.1 mol/L NaCl solution and 0.1 mol/L NaCl+0.01 mol/L NH₄NO₃ solution

Table 1 Effects of NH₄NO₃ on corrosion acceleration rates of four Mg-alloys

Fig.3 Polarization curves of AZ31, AZ91, AM60 and ZK61 Mg-alloys in 0.1 mol/L NaCl (a) and 0.1 mol/L NaCl+0.01 mol/L NH₄NO₃ (b) solutions

Table 2 Free corrosion current densities (I_corr) and corrosion rates (P_i) of four Mg-alloys in 0.1 mol/L NaCl solution

Fig.4 Corrosion morphologies of AZ31 (a1~a4), AZ91 (b1~b4) and ZK61 (c1~c4) alloys after immersion for 12 h in 0.1 mol/L NaCl solutions with different concentrations of NH₄NO₃: (a1) 0, (a2) 0.001 mol/L, (a3) 0.01 mol/L, (a4) 0.1 mol/L, (b1) 0, (b2) 0.007 mol/L, (b3) 0.02 mol/L, (b4) 0.04 mol/L, (c1) 0, (c2) 0.0002 mol/L, (c3) 0.05 mol/L, (c4) 0.09 mol/L

Fig.5 Pit parameters of AZ31, AZ91, AM60, ZK61 alloys during immersion in 0.1 mol/L NaCl and 0.1 mol/L NaCl+0.01 mol/L NH₄NO₃ solutions: (a) pit number density; (b) maximum pit depth; (c) mean pit depth; (d) pit diameter; (e)individual pit volume; (f) pit shape

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