73 research outputs found
STORAGE OF PITOMBEIRA SEEDS [Talisia esculenta (A. St. Hil) Radlk - SAPINDACEAE] IN DIFFERENT ENVIRONMENTS AND PACKAGINGS
Avaliação da Ação de Vigilùncia à Morbi-mortalidade Infantil na periferia de Belo Horizonte, Minas Gerais
Rosetas e concrescĂȘncias cristalinas silicificadas em Piper (Piperaceae): registros inĂ©ditos de macropadrĂ”es
Prepartum progestagen supplementation in swine: a strategy to facilitate piglet care and prevent early parturition
An approach to assess the potential of agroecosystems in providing environmental services
The nanostructure and microstructure of steels: Electrochemical Tafel behaviour and atomic force microscopy
The influence of chemical composition and heat treatment on a low-carbon steel, chromium steel and high speed steel has been examined by polarisation curves and electrochemical parameters deduced from the Tafel plots. The electrochemical corrosion resistance, which is small between the as-received steels become greater after heat treatment, following the order: carbon steelĂÂ <ĂÂ chromium steelĂÂ ~ĂÂ high speed steel. To explain these differences, the nano- and microstructure of the steels has been characterized by the ex situ techniques of atomic force microscopy and optical microscopy, before and after surface etching with Nital (a solution of 5% HNO3 in ethanol). This causes preferential attack of the ferrite phases showing the carbide phases more clearly. From these nanostructural studies it was possible to better understand why the passive films formed on chromium steel and high speed steel have superior protective properties to those formed on carbon steel.http://www.sciencedirect.com/science/article/B6TWS-4H2PJS6-2/1/0a3dfd1f1c9c9f35426cf6e9fb81026
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