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Materials 2017, 10(3), 275; doi:10.3390/ma10030275

The Effect of Heat Treatment on the Sensitized Corrosion of the 5383-H116 Al-Mg Alloy

1
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung City 807, Taiwan
2
Department of Electrical Engineering, Fortune Institute of Technology, No. 28, Zhixue Rd., Daliao Dist., Kaohsiung City 831, Taiwan
3
Naval Shipbuilding Development Center, Navy Command R.O.C., Taipei City 104, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Chien-Hung Liu
Received: 27 December 2016 / Revised: 26 February 2017 / Accepted: 6 March 2017 / Published: 9 March 2017
(This article belongs to the Special Issue Selected Material Related Papers from ICI2016)
View Full-Text   |   Download PDF [5974 KB, uploaded 9 March 2017]   |  

Abstract

In this study, the effects of heat treatment and sensitized corrosion on the 5383-H116 Al-Mg alloy were investigated for temperatures ranging from 100 to 450 °C. The results show that the heat treatment temperature is the main factor that causes changes to the microstructure and mechanical strength of the 5383-H116 Al-Mg alloy, inducing β-phase (Al3Mg2) precipitation in the form of a continuous layer along the grain boundaries. Intergranular corrosion was caused by the β-phase of the grain boundary precipitation, and the corrosion susceptibility of the recrystallized structure was significantly higher than the corrosion susceptibility of the recovered structure. According to the conductivity values detected, β-phase precipitation can enhance the 5383-H116 Al-Mg alloy conductivity, with the response due to structural dislocation density being higher than that due to the recrystallized structure. As such, the β-phase precipitation after sensitization is more significant than the β-phase precipitation prior to the sensitization, such that after sensitization, the conductivity rises to a significantly higher level than that exhibited by the recrystallization structure. View Full-Text
Keywords: 5383-H116 Al-Mg alloy; sensitization; NAMLT; β phase-Al3Mg2 5383-H116 Al-Mg alloy; sensitization; NAMLT; β phase-Al3Mg2
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Lin, Y.-K.; Wang, S.-H.; Chen, R.-Y.; Hsieh, T.-S.; Tsai, L.; Chiang, C.-C. The Effect of Heat Treatment on the Sensitized Corrosion of the 5383-H116 Al-Mg Alloy. Materials 2017, 10, 275.

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