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Article

Effects of Mn, Zn Additions and Cooling Rate on Mechanical and Corrosion Properties of Al-4.6Mg Casting Alloys

1
Department of Vehicle Engineering, Army Academy R.O.C., Jhongli 32092, Taiwan
2
Institute of Material Science and Engineering, National Central University, Jhongli 32001, Taiwan
3
Materials and Electro-Optics Research Division, Chung-Shan Institute of Science and Technology, Longtang 32557, Taiwan
*
Author to whom correspondence should be addressed.
Materials 2020, 13(8), 1983; https://doi.org/10.3390/ma13081983
Received: 9 February 2020 / Revised: 16 April 2020 / Accepted: 17 April 2020 / Published: 24 April 2020
(This article belongs to the Special Issue Advanced Surface Treatment Technologies for Metallic Alloys)
The mechanical properties of the Al-Mg alloy can be enhanced by adding metallic elements, but a continuous distribution of precipitates at grain boundaries leads to intergranular corrosion during sensitization treatment. In the present work, Mn, Zn additions, water cooling and furnace cooling were executed to investigate their effects on the mechanical and corrosion properties of the Al-4.6Mg alloy. Our results show that adding Mn to Al-4.6Mg alloys may produce grain refinement and dispersion strengthening, increasing tensile strength and hardness. The presence of Mn did not affect the corrosion resistance of Al-Mg alloys. Adding Zn to the Al-4.6Mg alloy increased tensile strength and hardness, but decreased corrosion resistance. Combined, the addition of Mn and Zn to the Al-4.6Mg alloy exhibited the highest tensile strength and hardness, but seriously reduced corrosion resistance. Furnace cooling substituted for water quenching could avoid intergranular corrosion, but slightly decreased the tensile strength and hardness by 7.0% and 6.8%, respectively. View Full-Text
Keywords: Al-4.6Mg alloy; Mn addition; Zn addition; cooling rate; corrosion properties Al-4.6Mg alloy; Mn addition; Zn addition; cooling rate; corrosion properties
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MDPI and ACS Style

Wu, C.-T.; Lee, S.-L.; Chen, Y.-F.; Bor, H.-Y.; Liu, K.-H. Effects of Mn, Zn Additions and Cooling Rate on Mechanical and Corrosion Properties of Al-4.6Mg Casting Alloys. Materials 2020, 13, 1983. https://doi.org/10.3390/ma13081983

AMA Style

Wu C-T, Lee S-L, Chen Y-F, Bor H-Y, Liu K-H. Effects of Mn, Zn Additions and Cooling Rate on Mechanical and Corrosion Properties of Al-4.6Mg Casting Alloys. Materials. 2020; 13(8):1983. https://doi.org/10.3390/ma13081983

Chicago/Turabian Style

Wu, Chih-Ting, Sheng-Long Lee, Ye-Feng Chen, Hui-Yun Bor, and Kung-Hui Liu. 2020. "Effects of Mn, Zn Additions and Cooling Rate on Mechanical and Corrosion Properties of Al-4.6Mg Casting Alloys" Materials 13, no. 8: 1983. https://doi.org/10.3390/ma13081983

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