Distinction in corrosion resistance of selective laser melted Ti-6Al-4V alloy on different planes. (October 2016)

• Record Type: Journal Article
• Authors: Dai, Nianwei; Zhang, Lai-Chang; Zhang, Junxi; Zhang, Xin; Ni, Qingzhao; Chen, Yang; Wu, Maoliang; Yang, Chao
• Is Part Of: Corrosion science. Volume 111(2016)
• Page Start: 703
• Page End: 710
• Publication Date: 2016-10
• Subjects: A. Titanium -- B. X-ray diffraction -- B. EIS -- B. SEM -- C. Passivity; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2016.06.009
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: The SLM-produced Ti-6Al-4V alloy exhibits a higher corrosion rate in 1 M HCl solution than that in 3.5 wt.% NaCl solution and XZ-plane of the SLM-produced Ti-6Al-4V alloy gives rise to the inferior corrosion resistance compared with its XY-plane. Highlights: Corrosion resistance of selective laser melted Ti-6Al-4V was investigated. XY-plane of Selective laser melted alloy shows a better corrosion resistance. More α' and less β-Ti weaken the corrosion resistance of XZ-plane. Abstract: Electrochemical measurements and microstructural analysis were performed to study the corrosion resistance of different planes of Ti-6Al-4V alloy manufactured by selective laser melting (SLM). The electrochemical results suggest that its XY-plane possesses a better corrosion resistance compared to XZ-plane in 1 M HCl solution, in spite of slight difference in 3.5 wt.% NaCl solution, suggesting that the different planes exhibit more pronounced distinction in corrosion resistance in harsher solution system. The inferior corrosion resistance of XZ-plane is attributed to the presence of more α′ martensite and less β-Ti phase in microstructure for XZ-plane than for XY-plane of the SLM-produced Ti-6Al-4V alloy.