Abstract
The poor corrosion resistance of magnesium alloys is one of the major obstacles to their widespread applications in the engineering field and the medical field. A hot deformation process is the main way to improve the corrosion resistance of magnesium alloys. In the present study, X-ray photoelectron spectroscopy (XPS), a scanning electron microscope (SEM), an electron probe micro-analyzer (EPMA) and X-ray diffraction (XRD) were used to investigate the micro-galvanic corrosion behavior and film protection mechanism of hot-rolled Mg-2Zn-2Er-0.3Zr-0.3Mn under 25%, 50% and 75% thickness reductions in Hank’s solution. The results revealed that the best corrosion resistance was obtained in the alloy under a 75% thickness reduction, with a corrosion rate of 0.85 mm/y. The improvement in anti-corrosion was due to the coupling effect of a refined microstructure and dense degradation film on the large deformation hot-rolled alloy. Furthermore, the elements Mn and Er participated in the film formation and stabilized the film structure.
Highlights
Mg-based alloys have been regarded as excellent biomedical materials and achieve complete degradation due to a low density, good progressing ability and specific elastic modulus, which is similar to natural bone [1,2]
A low absolute strength and relatively low corrosion resistance are two main disadvantages that restrict wide industrial and clinical applications of Mg alloys. They are essential to improving the corrosion resistance by alloying elements and performing the deformation process of magnesium alloys for their successful application as bearing structures and implant materials
A large number of equiaxed grains existed in the HR-50 and HR-75 alloys due to the large deformation process
Summary
Mg-based alloys have been regarded as excellent biomedical materials and achieve complete degradation due to a low density, good progressing ability and specific elastic modulus, which is similar to natural bone [1,2]. A low absolute strength and relatively low corrosion resistance are two main disadvantages that restrict wide industrial and clinical applications of Mg alloys. They are essential to improving the corrosion resistance by alloying elements and performing the deformation process of magnesium alloys for their successful application as bearing structures and implant materials. The element Er has not been extensively studied to enhance the anti-corrosion ability, while the mechanical property has been significantly improved by using Er [6,7,8,9]. Panemangalore et al [21] found that the corrosion resistance of Mg-2Zn was greatly enhanced by the addition of the element Er (2 wt.%). The corrosion rate decreased from 0.13 to 0.078 mm/y
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
