Effects of Mg17Sr2 Phase on the Bio‐Corrosion Behavior of Mg–Zr–Sr Alloys1. Issue 2 (2nd July 2015)

• Record Type: Journal Article
• Authors: Ding, Yunfei; Li, Yuncang; Wen, Cuie
• Is Part Of: Advanced engineering materials. Volume 18:Issue 2(2016:Feb.)
• Page Start: 259
• Page End: 268
• Publication Date: 2015-07-02
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201500222
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : The effect of the second phase Mg17 Sr2 on the biocorrosion behavior of Mg5ZrxSr ( x = 0, 2, 5 wt%) alloys before and after solution treatment was investigated. Electrochemical impedance spectroscopy, cathodic polarization and hydrogen evolution were used to evaluate the biocorrosion of Mg5ZrxSr. We found that Mg17 Sr2 precipitated on boundary zones and enhanced the galvanic effect, leading to a severer corrosion of the Mg matrix adjacent to Mg17 Sr2 . The corrosion subsequently spread gradually from the regions adjacent to the Mg17 Sr2 to the central Mg matrix. However, a high volume fraction of Mg17 Sr2 could also form a continuous network, isolate the Mg matrix and act as a barrier of corrosion. Abstract : The Mg17 Sr2 phase in Mg5ZrxSr ( x ≤ 5 wt%) alloys plays a crucial role on their bio‐corrosion behavior . The corrosion starts from the galvanic effects between the Mg17 Sr2 phase and the Mg matrix and subsequently extends from the regions adjacent to the Mg17 Sr2 phase gradually to the central Mg matrix.