No abstract

The present work is a study of the thermally treated [Ti] alloy Ti6Al4V by annealing at two different temperatures [700 and 800 °C] and its resistance and corrosion behavior were evaluated using electrochemical techniques such as: polarization curves [CP] and electrochemical impedance spectroscopy [EIS] in a Hank's salt solution. In addition, the samples were characterized by scanning Electron Microscopy [SEM] and microanalysis by X-ray Spectroscopy by energy dispersion [EDS], in their conditions of arrival [untreated] and after thermal treatments [TT] and chemical conversion with cerium and lanthanum salts [CCT]. The results of the electrochemical tests indicate the decrease in the corrosion rate of the samples with CCT and TT with respect to the untreated and the presence of biphasic microstructure constituted by an α -rich [Alrich] matrix with β [V -rich].

The present work is a study of the effect of surface finish (grade 1000, 1200 and fine polishing to 3 μ) and of the corrosion resistence in films obtained by heat treatment (HT) an annealing at two different temperatures (700 and 800 °C) in Ti6Al4V alloy. Corrosion behavior through the use of electrochemical techniques such as polarization curves (CP) and electrochemical impedance spectroscopy (EIS) in a Hank's saline solution was evaluated. In addition, the samples were characterized by Scanning Electron Microscopy (SEM) and microanalysis by Energy Dispersion X-ray Spectroscopy (EDS), in their arrival conditions (untreated) and after heat treatments (HT). The microstructural characterization revealed the presence of a biphasic microstructure a phase matrix α (rich in Al) with β (rich in V) distributed in the grain boundaries. The results of the electrochemical evaluation indicate decrease in the corrosion rate of the samples with HT at (700 and 800 °C) with respect to the untreated samples.

In this research, the electrochemical study of coatings obtained by means of cerium-based chemical conversion treatments (CCT) on the alloy Ti6Al4V previously modified through a thermal annealing treatment (TT) is presented.These coatings were assessed with X-ray diffraction (XRD) to determine the phases present on the surface, while both morphology and substrate coating were performed by means of Scanning Electron Microscopy (SEM). Additionally, by the use of techniques like Polarization Curves (PC) and Electrochemical Impedance Spectroscopy (EIS), the electrochemical characterization was performed using a phosphate buffered saline solution (PBS) as electrolyte. ECS Transactions, 64 (27) 77-95 (2015) 77 ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 134.117.10.200 Downloaded on 2015-06-29 to IP

This work presents electrochemical noise measurement results from assessment of 2-methyl-2-imidazoline as inhibitor on a 1018 steel, at different relative humidity, categorized according to ASTM E 104 85. A modified steel plates atmospheric corrosion probe (MECA) was used in order to measure potential and current noise time series; by using MECA, atmospheric corrosion rate could be determined, even if humidity was low. Imidazoline is widely used in petrochemical industry as a corrosion inhibitor, so that was the reason for studying the behavior of this inhibitor in other corrosive processes as in the packaging or protection of metals exposed to atmosphere. Spectral and statistical analysis of the noise data was carried out; after that, polarization curves were conducted to validate the information from noise and the use of MECA monitor. From the results, it was established that 2-methyl-2 imidazoline decreasing anodic potential and modifies the double layer adsorption. The use of MECA monitor was validated, founding that records were reliable for electrochemical measurements of atmospheric corrosion.