Corrosion Behavior of Heat-Treated Intermetallic Titanium-Nickel in Hydrochloric Acid Solutions

Abstract

Samples of 45% Ti-55% Ni alloy (Ti-Ni) were and their anodic behavior in 0.3 M, 1 M, 2 M, and 4 M hydrochloric acid (HCl) solutions was studied. In 0.3 M HCl, heat-treated Ti-Ni was passive, and very low anodic currents were observed. In 1 M and 2 M HCl, heattreated Ti-Ni was dissolved actively, while heat-treated and surface-ground Ti-Ni became passive. The effect was explained by selective oxidation of Ti-Ni and formation of a layered structure on its surface with discontinuous titanium oxide and a nickel-enriched zone underneath. The latter was dissolved in the HCl solutions, thus accelerating failure of the Ti-Ni samples. In 4 M HCl, heat-treated and heat-treated/ ground samples were dissolved readily.

A Model Construction of Starvation Induces Hepatic Steatosis and Transcriptome Analysis in Zebrafish Larvae

“…Previous reports have shown that the CD36 pathway plays a crucial role in NAFLD induced by high-fat diets [ 47 , 48 , 49 , 50 ], which is a key transporter of free fatty acid uptake in liver. In high-fat diet induced NAFLD patients and animal models, up-regulation of CD36 were commonly detected.…”

Susceptibility to localized corrosion of stainless steel and NiTi endodontic instruments in irrigating solutions

“…The files were embedded along their longitudinal axis in an epoxy resin with good edge retention and were wet polished with SiC papers up to 1000 grits. The latter ensures that all the surfaces have the same roughness, which is a critical parameter in measuring corrosion behaviour (Stratovetsky et al 1998). The size of the exposed area after polishing was measured using an optical microscope and an image analysis procedure.…”

“…Corrosion mechanism might be activated during chemomechanical preparation, chemical disinfection or sterilization. Although the corrosion behaviour of several materials used for file manufacture has been studied in different irrigating solutions (Speck & Fraker 1980, Edie et al 1981, Mueller 1982, Rondelli 1996, Stratovetsky et al 1998, Stokes et al 1999, Dartar Ö ztan et al 2002, Gurappa 2002, data regarding the potential of pitting or crevice corrosion of endodontic files are deficient. The aim of the present work was to evaluate and compare the electrochemical behaviour and the potential of pitting and crevice corrosion of representative SS and NiTi files when immersed in two commonly used irrigating solutions (NaOCl and R-EDTA).…”

“…Although the corrosion behaviour of several materials used for file manufacture has been studied in different irrigating solutions (Speck & Fraker 1980, Edie et al. 1981, Mueller 1982, Rondelli 1996, Stratovetsky et al. 1998, Stokes et al.…”