中國(guó)有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 31 No. 6 June 2021 |
（1. State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China;
3. The Key Laboratory of Chongqing Inorganic Special Functional Materials, School of Materials Science and Engineering, Yangtze Normal University, Chongqing 408100, China;
4. Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637002, China;
5. College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China）
Abstract:Mg-Al layered double hydroxides (LDHs), produced on cast Mg-xCa (x=0.5, 0.8, 2.0, wt.%) alloys by an in-situ growth method, showed good corrosion resistance compared to the bare magnesium substrate. The influence mechanism of the second phase (Mg2Ca) on LDHs production was investigated. Increasing Ca content increased the amount of Mg2Ca, decreasing the grain size and the corrosion rate of the alloys. The increased amount of the second phase particles and the grain refinement promoted the growth of LDHs, and thus led to the decreasing of corrosion rate of the Mg-xCa alloys with LDHs. A higher Mg2Ca amount resulted in forming fluffy LDHs. Due to the dual effects of the second phase (Mg2Ca) for LDHs growth and microgalvanic corrosion, LDHs/Mg-0.8Ca showed the lowest corrosion rate.
Key words: Mg-Ca alloys; Mg-Al layered double hydroxides; corrosion resistance; in-situ growth; self-healing
