Corrosion characterization of Ti-6Al-4V coating layer by the alternating current assisted GTAW method. (1st April 2022)

• Record Type: Journal Article
• Authors: Huang, Jiankang; Huang, Yanqin; Yu, Xiaoquan; Liu, Guangyin; Yu, Shurong; Fan, Ding
• Is Part Of: Corrosion science. Volume 197(2022)
• Publication Date: 2022-04-01
• Subjects: AC-GTAW -- Coating layer -- Ti-6Al-4V -- Microstructure -- Corrosion resistance; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.110066
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: To improve the corrosion resistance of Ti-6Al-4V alloy, a Ti-6Al-4V coating layer was deposited by the alternating current assisted gas tungsten arc welding (AC-GTAW) method. The effect of auxiliary alternating current on the microstructure and corrosion resistance of coating layers was investigated. The results show that the AC-GTAW coating layer has strong corrosion resistance due to α-widmanstatten colony structure. The oxides and hydroxides were formed on the coating layers surface after corrosion, and the microstructure and alloy element had a significant influence on the corrosion characteristic of the Ti-6Al-4V coating layers. Graphical Abstract: ga1 Highlights: An anti-corrosion coating layer was fabricated on Ti6Al4V alloy surface by AC-GTAW method. The phase transformation temperature and cooling rate will be decreased under the coupled magnetic-thermal field. The microstructure was a lamellar structure in coating layers, which could improve the microhardness and corrosion resistance. Al2 O3, TiO2, Na2 O oxides exist on the surface of the coating layer after corrosion.