The corrosion and passivity of sputtered Mg–Ti alloys. (March 2016)

• Record Type: Journal Article
• Authors: Song, Guang-Ling; Unocic, Kinga A.; Meyer, Harry; Cakmak, Ercan; Brady, Michael P.; Gannon, Paul E.; Himmer, Phil; Andrews, Quinn
• Is Part Of: Corrosion science. Volume 104(2016)
• Page Start: 36
• Page End: 46
• Publication Date: 2016-03
• Subjects: A. Mg alloy -- B. SEM -- B. TEM -- B. XPS -- C. Passivity; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2015.11.028
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: A supersaturated single phase Mg–Ti alloy can be obtained by magnetron sputtering. The anodic dissolution of Mg–Ti alloy is inhibited by Ti addition. The alloy becomes passive when Ti content is high and the alloy has become Ti based. The formation of a continuous thin passive film is responsible for the passivation of the alloy. Abstract: This study explored the possibility of forming a "stainless" Mg–Ti alloy. The electrochemical behavior of magnetron-sputtered Mg–Ti alloys was measured in a NaCl solution, and the surface films on the alloys were examined by XPS, SEM and TEM. Increased corrosion resistance was observed with increased Ti content in the sputtered Mg–Ti alloys, but passive-like behavior was not reached until the Ti level (atomic %) was higher than the Mg level. The surface film that formed on sputtered Mg–Ti based alloys in NaCl solution was thick, discontinuous and non-protective, whereas a thin, continuous and protective Mg and Ti oxide film was formed on a sputtered Ti–Mg based alloy.