Improved corrosion resistance of Mg–8Sn–1Zn–1Al alloy subjected to low-temperature indirect extrusion

Citation data:

Corrosion Science, ISSN: 0010-938X, Vol: 141, Page: 203-210

Publication Year:
2018
Captures 6
Readers 6
Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/24921
DOI:
10.1016/j.corsci.2018.06.011
Author(s):
Baek, Soo-Min; Kang, Jeong Su; Kim, Jong Chan; Kim, Beomcheol; Shin, Hyung-Joon; Park, Sung Soo
Publisher(s):
Elsevier BV; PERGAMON-ELSEVIER SCIENCE LTD
Tags:
Chemistry; Chemical Engineering; Materials Science; Magnesium; Alloy; Extrusion; Weight loss; Pitting corrosion
article description
We report that the corrosion resistance of Mg–8Sn–1Zn–1Al alloy is significantly improved by the application of a low-temperature indirect extrusion process utilizing artificial cooling. It was found that the corrosion rates, measured by immersion tests in 0.6 M NaCl solution at 25 °C, are 27.5 and 246.7 mm y −1 for the alloys extruded with and without artificial cooling, respectively. The remarkably improved corrosion resistance is mainly attributed to the reduced nobility of cathodic Al 5 Fe 2 particles, which results in retarded microgalvanic corrosion in the corrosive condition. Metallurgical factors affecting the electrochemical nobility of Al 5 Fe 2 particles are discussed.