Development of Flame-Retardant Wrought Magnesium Alloys and Application of the Alloys to High-Speed Railway Body

Effect of Al and Ca Elements on the Atmospheric Corrosion of Field-Exposed Mg–Al–Zn–Ca–Mn Magnesium Alloys

“…Detailed information on material properties is available elsewhere. 6 An AZ91D alloy plate prepared using a hot-chamber process was also studied. The microstructures of the samples were examined using an optical microscope (Nikon Eclipse) after polishing with #2400 SiC paper followed by etching with a mixture of picric acid and ethanol for several minutes.…”

“…24 Mg-Al series alloys containing calcium (Ca) have attracted increasing attention due to their higher mechanical properties resulting from precipitation hardening of (Al, Mg) 2 Ca and Al 2 Ca phases, as well as their flame-retardant properties. 6 These Al-Ca precipitates also affect corrosion resistance. In aqueous environments, the Ca addition of up to 2wt% (hereafter %) refines the grain z E-mail: i.nakatsugawa@aist.go.jp *Electrochemical Society Member.…”

“…3,4 In contrast, fewer investigations have been conducted on atmospheric corrosion, which is important for Mg components used outdoors, such as in automobiles and trains. [5][6][7] Field exposure testing is considered a benchmark for assessing the long-term reliability of materials. 8,9 However, owing to the difficulties in determining the effects of numerous environmental factors, such as relative humidity, temperature, gas constituents, sea salts, etc, cabinet testing under controlled and simulated conditions is being actively conducted.…”