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Anticorrosion behavior of conversion coatings obtained from unbuffered cerium salts solutions on AA6061-T6

Journal of Rare Earths 2011年第10期29卷 961-968页

作者： KIYOTA Sayuri VALDEZ Benjamin STOYTCHEVA Margarita ZLATEV Roumen bastidas jose maria Engineering Institute of UABC B.Juárez Blvd.and Normal St.21280 MexicaliB.C.Mexico CENIM-National Centre for Metallurgical Research CSIC8Gregorio del Amo Ave.28040 MadridSpain

The anticorrosive properties of cerium based conversion coatings deposited on AA6061-T6 alloy by immersion in tmbuffercd cerium chloride and cerium nitrate solutions in the presence of hydrogen peroxide were investigated and characterized by potentiodynamic po- larization （PDP） and electrochemical impedance spectroscopy （EIS） in 0.5 mol/L NaCl aqueous solution. The microstructure and chemical composition of the protective films were examined by scanning electron microscopy （SEM） and energy dispersive X-ray spectroscopy （EDS）. It was found that the best corrosion protection was afforded by the samples treated during 600 s in cerium chloride solution at pH values ~5.5-4, showing higher amounts of cerium and polarization resistance values greater than 10 f~ m2. Moreover, an ennoblement of the corro- sion potential and decreasing of the cathodic and anodic currents were obtained compared with the cerium nitrate solutions application. This behavior was attributed to the influence of the deposition parameters such as type of the salt anion, i.e., chelating effect and chaotropic characteristics, pH fluctuations in the conversion solution and deposition time.

关键词： cerium based conversion coatings EIS PDP anticorrosion properties rare earths

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Development of a Tropospheric Lidar for Observations of the Planetary Boundary Layer above Medellin, Colombia

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Journal of Physical Science and Application 2011年第3期1卷 163-169页

作者： Daniel jose Nisperuza Toledo Alvaro Efrain bastidas Gustin Physics School Universidad Nacional de Colombia Medellin Calle 59A No 63-20 Colombia

In the Universidad Nacional de Colombia, Sede Medellin, the Lasers and Spectroscopy Group （GLEO） has been designed and manufactured a tropospheric lidar station based on a pulsed Nd：YAG laser operating at 532-nm wavelength. The main scientific objective has been to evaluate the vertical structure of the Planetary Boundary Layer （PBL） in urban sites of Medellin-Colombia, South America, （Longitude 75°34′05″ West, Latitude 6°13′55″ North）, using suspended aerosols as tracers of the atmospheric motion. This paper reports the design, manufactures and performance of an elastic lidar system, which was operated under varying air pollution and meteorological conditions and the observations presented here were performed in early 2010, over the metropolitan area of Medellin, city included in the Andean region of Colombia.

关键词： Tropospheric lidar planetary boundary layer (PBL)

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