TY - JOUR
T1 - Mechanoelectrochemical behavior of pure magnesium and magnesium alloys stressed in aqueous solutions
AU - Gutman, E. M.
AU - Unigovski, Ya
AU - Eliezer, A.
AU - Abramov, E.
N1 - Funding Information:
The present work was sponsored by the Consortium of Magnesium Technologies Development (Israel’s Ministry of Industry and Trade). We would like to thank Dr. N. Frumin, T. Ben-Shahar, G. Ben-Hamu, and L. Riber (Ben-Gurion University of the Negev) for kind assistance in AES, in mechanochemical, and corrosion creep tests. We thank Z. Koren and H. Rosenson (Israel Insti- tute of Metals, Technion. Haifa) for supplying us with die-cast specimens.
PY - 2000/1/1
Y1 - 2000/1/1
N2 - A new synergistic effect of corrosion and stress on the viscoelasticity of pure magnesium and magnesium alloys has been shown. This phenomenon named corrosion creep has been studied in 99.9653% Mg, die-cast AZ91D (Mg-9% Al-1% Zn), AM50 (Mg-5% Al-0.4% Mn), and AS21 (Mg-2.3% Al, 0.23% Mn, 1.10% Si) alloys. Creep tests were carried out at 25°C in air and in the borate buffer aqueous solution (pH 9.3). It is found that the highest sensitivity to creep in the corrosive environment is observed in the alloy with the highest Al content. This agrees with the data obtained earlier in the study of mechanoelectrochemical behavior and corrosion fatigue of Mg alloys. However, in air, the creep behavior of all alloys at room temperature is approximately the same. Creep life of pure magnesium and its alloys significantly decreases in a corrosive environment. Corrosion-creek cracks filled with magnesium hydroxide particles were observed by SEM-EDS analysis at the surface of AS21 alloy. The thickness of the oxide layer defined by AES in samples of AZ91D, AM50, and AS21 alloys placed for 2 h into the borate solution amounts to ∼540, ∼1320, and ∼1440 nm, respectively. This can be explained with the account for surface phenomena.
AB - A new synergistic effect of corrosion and stress on the viscoelasticity of pure magnesium and magnesium alloys has been shown. This phenomenon named corrosion creep has been studied in 99.9653% Mg, die-cast AZ91D (Mg-9% Al-1% Zn), AM50 (Mg-5% Al-0.4% Mn), and AS21 (Mg-2.3% Al, 0.23% Mn, 1.10% Si) alloys. Creep tests were carried out at 25°C in air and in the borate buffer aqueous solution (pH 9.3). It is found that the highest sensitivity to creep in the corrosive environment is observed in the alloy with the highest Al content. This agrees with the data obtained earlier in the study of mechanoelectrochemical behavior and corrosion fatigue of Mg alloys. However, in air, the creep behavior of all alloys at room temperature is approximately the same. Creep life of pure magnesium and its alloys significantly decreases in a corrosive environment. Corrosion-creek cracks filled with magnesium hydroxide particles were observed by SEM-EDS analysis at the surface of AS21 alloy. The thickness of the oxide layer defined by AES in samples of AZ91D, AM50, and AS21 alloys placed for 2 h into the borate solution amounts to ∼540, ∼1320, and ∼1440 nm, respectively. This can be explained with the account for surface phenomena.
KW - Borate buffer solution
KW - Corrosion creep
KW - Magnesium alloys
KW - Pure magnesium
UR - http://www.scopus.com/inward/record.url?scp=0034216567&partnerID=8YFLogxK
U2 - 10.1023/A:1011399723559
DO - 10.1023/A:1011399723559
M3 - Article
AN - SCOPUS:0034216567
SN - 1064-7562
VL - 8
SP - 133
EP - 138
JO - Journal of Materials Synthesis and Processing
JF - Journal of Materials Synthesis and Processing
IS - 3-4
ER -