Corrosion behavior of commercially pure Mg and ZM21 Mg alloy in Ringer’s solution – Long term evaluation by EIS

• Published in: Corrosion science Vol. 53; no. 2; pp. 645 - 654
• Main Authors: Jamesh, M., Kumar, Satendra, Sankara Narayanan, T.S.N.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-02-2011; Elsevier
• Subjects: A. Alloy; A. Magnesium; Applied sciences; B. EIS; B. IR spectroscopy; C. Anodic dissolution; Calcium carbonate; Corrosion; Corrosion environments; Corrosion products; Crystals; Electrochemical impedance spectroscopy; Exact sciences and technology; Implants; Magnesium; Magnesium base alloys; Metals. Metallurgy; A. Magnesium; A. Alloy; B. EIS; C. Anodic dissolution; B. IR spectroscopy; Infrared spectrometry; Electrochemical corrosion; Anodic dissolution; Impedance
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2010.10.011

► ZM21 Mg alloy offers a higher corrosion resistance than CP Mg. ► Mg(OH)
2 and aragonitic CaCO
3 are the corrosion products on CP-Mg and ZM21 Mg alloy. ► Thickening of the corrosion product layer is delayed in CP Mg. ► ZM21 Mg alloy is a promising candidate for degradable implant.
Evaluation of the corrosion behavior of commercially pure magnesium (CP-Mg) and ZM21 Mg alloy immersed in Ringer’s solution for 92
h by electrochemical impedance spectroscopy (EIS) is addressed. The formation of a compact layer of well-developed rod-like aragonitic CaCO
3 crystals and its subsequent thickening with increase in immersion time offers a higher corrosion protective ability for ZM21 Mg alloy. The formation of a mud-crack pattern and a large number of clusters of needle-like crystals offers a relatively lower corrosion resistance for CP-Mg. The study suggests that ZM21 Mg alloy is a promising candidate material for the development of degradable implants.