The present work is a continuation of our precedent studies [1, 2] as an attempt to characterize the corrosion products formed on the carbon steel (OL 37) exposed to natural and artificial environments, both having high relative humidity and chloride content. Samples of steel sheets of 200 . 100 . 2 mm dimension were prepared using abrasive blasting with specific requirements. As natural and artificial environment, a marine experiment site, respectively a salt spray test with specific exposure conditions, were used. Iron oxyhydroxides and oxides are typical constituents of rust, generated by the corrosion of steel surface in contact with aqueous phase [3, 4]. The phase composition of the rust depends on the physic-chemical factors from the environment such as: type of steel, time of exposure, electrolyte composition, pH and temperature [5, 6]. The composition and structure of carbon steel corrosion products for the two situations (accelerated lab and real conditions) were studied comparatively using an adequate FT-IR spectroscopy method and KBr pellets technique. The FT-IR spectrometer operates with OPUS program.
In this paper we present the results obtained from the study of Ni-Ti alloy obtained by arc melting method. To define the alloy's shape, this is constrained under deformation and then heat treated. The heat treatment is performed at temperatures ranging between 325 -525°C. Shape memory bands were obtained from these ingots, with a band -thickness of 1mm and a band-width of 3mm, exhibiting shape memory properties. Ni-Ti bands were analyzed by Scanning Electron Microscopy (SEM) and X-ray fluorescence at room temperature. The results showed that the Ni-Ti bands possess super-elastic properties, and the transformation temperature is -10°C; also, it has been noticed that the alloy has a higher content of titanium and exhibit shape memory effect. Based on the results obtained within this project, an actuator with improved properties for industrial applications will be realized.
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