4 research outputs found
Structure and function of the methanogenic microbial communities in Uruguayan soils shifted between pasture and irrigated rice fields
Stable carbon isotope biogeochemistry of propionate and acetate in methanogenic soils and lake sediments
Methane production from rice straw carbon in five different methanogenic rice soils: rates, quantities and microbial communities
Influence of noble metals alloying additions on the corrosion behaviour of titanium in a fluoride-containing environment
Titanium alloys exhibit excellent corrosion resistance in most aqueous media due to the formation of a stable oxide film, and some of these alloys (particularly Ti-6Al-7Nb) have been chosen for surgical and odontological implants for their resistance and biocompatibility. Treatment with fluorides (F-) is known to be the main method for preventing plaque formation and dental caries. Toothpastes, mouthwashes, and prophylactic gels can contain from 200 to 20,000 ppm F- and can affect the corrosion behaviour of titanium alloy devices present in the oral cavity. In this work, the electrochemical corrosion behaviour of Ti-1M alloys (M = Ag, Au, Pd, Pt) was assessed in artificial saliva of pH = 3.0 containing 910 ppm F- (0.05 M NaF) through open circuit potential, E-OC, and electrochemical impedance spectroscopy (EIS) measurements. The corrosion behaviour of the Ti-6Al-7Nb commercial alloy was also evaluated for comparison