Corrosion behavior of as-cast Mg-6Zn-4Si alloy with minor Sr addition

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Corrosion behavior of as-cast Mg-6Zn-4Si alloy with minor Sr addition
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Affiliation:Nanjing University of aeronautics and astronautics,Nanjing University of aeronautics and astronautics,Nanjing University of aeronautics and astronautics,Nanjing University of aeronautics and astronautics,Nanjing University of aeronautics and astronautics,Nanjing University of aeronautics and astronautics
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Fund Project:The Funding of Jiangsu Innovation Program for Graduate education (CXZZ13_0160); the Fundamental Research Funds for the Central Universities, Nanjing university of aeronautics and astronautics research funding (NS2013060); a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Abstract:

The microstructure and corrosion resistance of Mg-6Zn-4Si alloy with Sr addition were studied using XRD, OM, SEM, EDS, potentiodynamic polarization and immersion testing. A proper Sr addition observably modifies the morphologies and sizes of primary and eutectic Mg2Si phases in Mg-6Zn-4Si alloy. The grain size of the primary Mg2Si decreased initially and then gradually increased with the increasing of Sr amount. Sr significantly improves the corrosion resistance of Mg-6Zn-4Si alloy. The ternary alloy with 0.5Sr has the optimal corrosion resistance, which exhibits the highest corrosion potential, the lowest corrosion current density and corrosion rate. The homogeneous dispersion of fine Mg2Si particles with Sr element is responsible for the improvement of corrosion resistance. Excessive Sr (≥1.0%) leads to the generation of SrMgSi new phase, which has unfavorable effects on the corrosion resistance of the alloys.

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[Mengqi Cong, Ziquan Li, Jinsong Liu, Menghui Wang, Beibei Sheng, Bijun Wang. Corrosion behavior of as-cast Mg-6Zn-4Si alloy with minor Sr addition[J]. Rare Metal Materials and Engineering,2017,46(9):2405~2410.]
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Received:September 24,2015
Revised:February 16,2016
Adopted:March 30,2016
Online: November 29,2017
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