Corrosion behavior of selective laser melted Ti-6Al-4 V alloy in NaCl solution. (January 2016)

• Record Type: Journal Article
• Authors: Dai, Nianwei; Zhang, Lai-Chang; Zhang, Junxi; Chen, Qimeng; Wu, Maoliang
• Is Part Of: Corrosion science. Volume 102(2016)
• Page Start: 484
• Page End: 489
• Publication Date: 2016-01
• Subjects: A. Titanium -- B. EIS -- B. X-ray diffraction -- B. Polarization -- C. Passive films; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2015.10.041
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Corrosion of Ti-6Al-4 V manufactured by selective laser melting was investigated. SLM-produced alloy exhibits a worse corrosion resistance than Grade 5 alloy. The unfavorable corrosion resistance is related to the dominant α ' and less β –Ti. Abstract: Electrochemical measurements were performed to investigate the corrosion behavior of Ti-6Al-4 V alloy prepared by selective laser melting (SLM) and commercial Grade 5 sample for comparison. Electrochemical results showed that the SLM-produced sample possesses poorer corrosion resistance than the Grade 5 sample. Microstructure studies suggested that the SLM-produced sample is composed of dominant acicular α' martensite and some prior β grains, unlike the typical α + β microstructure in Grade 5 sample. The unfavorable corrosion resistance of the SLM-produced sample is related to the considerably large amount of acicular α ' and less β –Ti phase in the microstructure compared to the Grade 5 sample.