Details

Autor(en) / Beteiligte

• Wei-li Cheng Rui Huo Quan-wei Tian Liang Tian Shou-fan Rong

Titel

Corrosion behavior of as-cast binary Mg-Bi al oys in Hank＇s solution

Ist Teil von

• 中国铸造：英文版, 2015 (6), p.425-430

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Biodegradable Mg-xB i（x = 3, 6 and 9wt.%） alloys were fabricated by ingot casting, and the change of corrosion behavior of the alloys in the Hank＇s solution was analyzed with respect to the microstructure using optical micrograph（OM）, X-ray diffraction（XRD）, scanning electron microscope（SEM） equipped with an energy dispersive X-ray spectrometer（EDS）, electrochemical and immersion tests. The results show that the microstructures of the as-cast Mg-Bi alloys mainly consisted of dendritic α-Mg grains and Mg3Bi2 phase in common, with the secondary dendrite arm spacing（SDAS） decreasing significantly from 41.2 μm to 25.4 μm and the fraction of Mg3Bi2 increasing from 3.1% to 10.7%. Furthermore, the corrosion rate increasing from 1.32 mm·a-1 to 8.07 mm·a-1 as the Bi content was increased from 3wt.% to 9wt.%. The reduced corrosion resistance was mainly ascribed to the increasing fraction of the second phase particles, which bring positive effects on the development of pitting.