The corrosion behavior of sputter-deposited Mo-Ti alloys in concentrated hydrochloric acid

• Published in: Corrosion science Vol. 38; no. 10; pp. 1649 - 1667
• Main Authors: Park, P.Y., Akiyama, E., Habazaki, H., Kawashima, A., Asami, K., Hashimoto, K.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-10-1996; Elsevier Science
• Subjects: A. alloy; A. sputtered films; Applied sciences; B. polarization; B. XPS; C. passive films; Corrosion; Corrosion environments; Exact sciences and technology; Metals. Metallurgy; B. XPS; A. sputtered films; B. polarization; C. passive films; A. alloy; Hydrochloric acid; Corrosion resistance; Titanium alloy; Molybdenum alloy; Metal coating; Corrosion; Corrosion potential; Surface layer; Sputtering; Surface treatment; Passivation
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/S0010-938X(96)00041-8

Mo-Ti alloys composed of a single bcc solid solution have been prepared by a sputter deposition technique. The corrosion resistance of the Mo-Ti alloys in 12 M HCl is extremely high, being superior to that of molybdenum and titanium metals. The Mo-Ti alloys are spontaneously passivated in 12 M HCl. The corrosion potential of these alloys is slightly lower than that of molybdenum. The spontaneously passivated film on the alloys is significantly enriched in tetravalent molybdenum, as a consequence of preferential dissolution of titanium. The angle-resolved XPS analysis reveals that there is a compositional gradient in the passive film; molybdenum ions are concentrated in the exterior of the passive films while the concentration of titanium increases in the interior of the films.