Influence of Nd and Y additions on the corrosion behaviour of extruded Mg-Zn-Zr alloys

• Published in: International journal of minerals, metallurgy and materials Vol. 18; no. 2; pp. 203 - 209
• Main Authors: Chang, Jian-wei, Duo, Jun, Xiang, Ya-zhen, Yang, Hai-yan, Ding, Wen-jiang, Peng, Ying-hong
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01.04.2011; Springer Nature B.V
• Subjects: Alloys; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Corrosion; Corrosion and Coatings; Corrosion products; Corrosion resistance; Corrosion tests; Electrochemistry; Galvanic corrosion; Glass; Immersion tests (corrosion); Magnesium; Magnesium base alloys; Materials Science; Metallic Materials; NaCl溶液; Natural Materials; Neodymium; Rare earth metals; Sodium chloride; Surfaces and Interfaces; Thin Films; Tribology; Zirconium; 变形镁合金; 电化学测量; 耐腐蚀性; 腐蚀行为; 锆合金; magnesium alloys; neodymium; yttrium; corrosion resistance; rare earth additions; electrochemical properties
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-011-0423-z

To improve the corrosion resistance of wrought magnesium alloys through rare earth （RE） additions, the corrosion behaviour of Mg-5Zn-0.3Zr-xNd （x=0, 1, and 2; wt%） and Mg-5Zn-0.3Zr-2Nd-yY （y=0.5 and 1; wt%） alloys in a 5wt% NaCl solution was investigated using immersion test and electrochemical measurements. The results of immersion test show that Mg-5Zn-0.3Zr-2Nd alloy exhibits the best corrosion resistance among the tested alloys. Electrochemical measurements show that secondary phases in RE-containing Mg-5Zn-0.3Zr alloys behave as less noble cathodes in micro-galvanic corrosion and suppress the cathodic process. The additions of Nd and Y into Mg-5Zn-0.3Zr alloy also improve the compactness of the corrosion product film and are beneficial to the corrosion resistance.