Effect of alloyed Ca on the microstructure and corrosion properties of extruded AZ61 Mg alloy
- Citation data:
Corrosion Science, ISSN: 0010-938X, Vol: 112, Page: 44-53
- Publication Year:
- Repository URL:
- Chemistry; Chemical Engineering; Materials Science; A. Magnesium; A. Alloy; B. Weight loss; C. Pitting corrosion
Microstructure and corrosion properties of extruded AZ61 Mg alloys with varying Ca contents were investigated. Microstructure of the extruded AZ61 alloy consisted of α-Mg grains and Al 8 Mn 5 particles. Alloying with 0.1–0.5 wt% Ca to the AZ61 alloy resulted in the additional presence of (Mg,Al) 2 Ca particles in the extruded microstructure. In 0.6 M NaCl solution at 25 °C, the extruded AZ61 alloys with 0.1–0.5 wt% Ca showed corrosion rates over 2 times faster than that of the AZ61 alloy without Ca addition. Such deteriorated corrosion resistance due to Ca addition is discussed in terms of passivation and microgalvanic corrosion.