Open AccessRole of microstructure on the degradation behaviour of friction stir processed AZ series Mg alloys assessed in simulated physiological solutions
Author(s) -
V.V. Kondaiah,
Ch. Vasu,
Ravikumar Dumpala,
B. Ratna Sunil
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/653/1/012025
Subject(s) - microstructure , degradation (telecommunications) , immersion (mathematics) , corrosion , materials science , friction stir processing , metallurgy , grain size , scanning electron microscope , ion , composite material , chemistry , mathematics , computer science , telecommunications , organic chemistry , pure mathematics
In the current work, pure Mg and two Mg alloys (AZ31 and AZ91) were selected and processed by friction stir processing (FSP). After FSP, the effect of microstructure and the corroding environment on the degradation behaviour of processed and unprocessed materials in two different solutions (0.9M NaCl and Ringer’s solution) by immersion method. The samples after immersion were characterized by X-Ray diffraction (XRD) method and electron microscopy. Interestingly, corrosion rate of FSPed samples was observed as decreased compared with unprocessed condition when immersed in Ringer’s solu-tion. On contrary, the corrosion rate of FSPed samples was noticed as increased compared with unprocessed condition when immersed in 0.9M NaCl solution. The results strongly suggest that the effect of smaller grain size and the ion concentration of the simulated physiological solution have a significant influence on the degradation behaviour of Mg alloys which must be considered while developing Mg based biodegradable implant materials