Wislei R. Osório

Universidade Estadual de Campinas (UNICAMP)

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Amauri Garcia

Universidade Estadual de Campinas (UNICAMP)

Ausdinir D. Bortolozo

Universidade Estadual de Campinas (UNICAMP)

Leandro C. Peixoto

Federal Institute of São Paulo

José Eduardo Spinelli

Universidade Federal de São Carlos

Leonardo R. Garcia

Universidade Estadual de Campinas (UNICAMP)

Giovana da Silva Padilha

Universidade Estadual de Campinas (UNICAMP)

Célia Marina A. Freire

Universidade Estadual de Campinas (UNICAMP)

Rodrigo S. Bonatti

Universidade Estadual de Campinas (UNICAMP)

Noé Cheung

Universidade Estadual de Campinas (UNICAMP)

Emmanuelle S. Freitas

Universidade Federal de São Paulo

Cooperative Institutions

Universidade Estadual de Campinas (UNICAMP)

101

Hospital de Clínicas da Unicamp

Universidade de São Paulo

Universidade Federal de São Carlos

Universidade Estadual Paulista (Unesp)

Universidade Federal do Pará

Universidade Federal de São Paulo

Materia (United States)

Universidade Federal de Itajubá

Departamento de Ciência e Tecnologia

Author Statistics

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Effects of cell size and macrosegregation on the corrosion behavior of a dilute Pb–Sb alloy

Journal of Power Sources (2006)

Daniel Monteiro Rosa José Eduardo Spinelli Wislei R. Osório Amauri Garcia

10.1016/j.jpowsour.2006.07.016

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Citations (55)

Silicon Content Affecting Corrosion Behavior of Alp/Sip Composites in a Biodiesel Blend

CORROSION (2020)

Rodrigo S. Bonatti Yuri Alexandre Meyer Giovana da Silva Padilha Ausdinir D. Bortolozo Wislei R. Osório

This study is focused on the evaluation of the electrochemical behavior of three distinct Alp/Sip composites (i.e., 2.5 wt%, 5.0 wt%, and 7.5 wt% Si). In contrast to the stirring casting process, the composites are produced using both Al and Si powders (i.e., mixing, compacting, and sintering). The samples are immersed in a stagnant and naturally aerated biodiesel + ethanol blend, using lithium perchlorate (LiClO4) as a supporting electrolyte, at 25°C. Electrochemical impedance spectroscopy diagrams and equivalent circuits are analyzed and discussed. The densification levels and Si content affect the corrosion resistance responses. A “recovery” in the corrosion behavior in terms of impedance parameters of Al/7.5 Si composite is attained.

10.5006/3524

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Citations (7)

Corrosion Resistance and Mechanical Properties of an Al 9wt%Si Alloy Treated by Laser Surface Remelting

International Journal of Electrochemical Science (2009)

Wislei R. Osório Noé Cheung Leandro C. Peixoto Amauri Garcia

The correlation of corrosion behavior and mechanical properties with microstructure parameters can be very useful for planning solidification conditions in order to achieve a desired level of final properties. The aim of the present work is to investigate the influence of microstructural array parameters of as-cast and laser remelted Al-9 wt% Si alloy samples on the resulting mechanical properties and the electrochemical behavior. As-cast samples were obtained with two different cooling rates and surface remelted samples by laser were obtained with a continuous CO2 laser. Electrochemical impedance spectroscopy (EIS) technique and Tafel's plots in a 0.5M NaCl test solution at 25°C were carried out. An equivalent circuit has also been proposed and impedance parameters have been simulated by the Zview® software. Laser surface remelting (LSR) have induced microstructural morphologies typified by highly branched fine silicon fibers with a deleterious effect on the electrochemical corrosion resistance.

10.1016/s1452-3981(23)15186-8

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Citations (63)

Mechanical properties of Sn–Zn lead-free solder alloys based on the microstructure array

Materials Characterization (2010)

Leonardo R. Garcia Wislei R. Osório Leandro C. Peixoto Amauri Garcia

Morphology

10.1016/j.matchar.2009.11.012

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Citations (108)

Microstructural modification by laser surface remelting and its effect on the corrosion resistance of an Al–9wt%Si casting alloy

Applied Surface Science (2007)

Wislei R. Osório Noé Cheung José Eduardo Spinelli Kleber S. Cruz Amauri Garcia

Surface Modification

10.1016/j.apsusc.2007.10.013

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Citations (45)

The effect of the dendritic microstructure on the corrosion resistance of Zn–Al alloys

Journal of Alloys and Compounds (2005)

Wislei R. Osório Célia Marina A. Freire Amauri Garcia

Dendrite (mathematics)

Redistribution

10.1016/j.jallcom.2005.01.035

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Citations (124)

Corrosion Behavior of CW6MC Nickel Cast Alloy (Inconel 625) Welded by Shielded Metal Arc Welding

Metals (2021)

Guilherme dos Santos Vacchi Rodrigo Silva Cristie Luis Kugelmeier Claudio Beserra Martins Júnior Isabela Dainezi

The aim of this study concerns the effect of multi-pass shielded metal arc welding (SMAW) on the corrosion behavior of CW6MC cast nickel alloy. Using optical and SEM techniques the welded joint is analyzed. Vickers microhardness mapping and potentiodynamic polarization in NaCl and H2SO4 solutions are also evaluated. Both the Laves phase and NbC-type carbides are identified in the base metal (BM) and weld metal (WM) regions. The main microstructural difference observed between these regions is the morphology aspect and fineness of the dendritic arrays. The welding process promotes the finer columnar grains formation with refined intermetallic particles in the WM than equiaxed grains of the BM, which in turn results in higher microhardness values in the former region. However, no substantial changes were observed in the corrosion behavior between the BM and WM regions, considering both acid and saline media. Nevertheless, during the multi-pass SMAW process, some non-metallic micrometric inclusions (Mo and S-rich regions) can be constituted to occur in the WM region. This is associated with a significant drop in the corrosion performance of this region when the electrochemical tests are evaluated.

Equiaxed crystals

Laves phase

10.3390/met11081286

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Citations (7)

Electrochemical corrosion behaviour of a Ti‐IF steel and a SAE 1020 steel in a 0.5 M NaCl solution

Materials and Corrosion (2009)

Wislei R. Osório L. Peixoto Amauri Garcia

Abstract Investigations concerning the electrochemical corrosion behaviour of low carbon (LC) and ultra‐low carbon (ULC) steels are relatively scarce and limited. The present study aims to compare electrochemical impedance parameters and potentiodynamic polarization curves of an LC steel and an ULC Ti‐interstitial free (IF) steel evidencing the effects of carbon content and pearlite fraction on the electrochemical corrosion behaviour. Corrosion tests were carried out in a 0.5 M NaCl solution at 25 °C with a pH range between 6.5 and 6.8. It was found that the IF steel sample presents an electrochemical corrosion resistance, which is slightly higher than that of the LC steel sample.

Carbon steel

10.1002/maco.200905420

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Citations (22)

Effects of Microstructural Arrangement on Hot Corrosion Resistance of a Pb-Sb Alloy for Battery Grids

Materials science forum (2008)

Wislei R. Osório Claudia S. C. Aoki Amauri Garcia

It is well known that the solution characteristics, such as pH and temperature may affect the corrosion mechanism and the corrosion behavior. Lead acid batteries manufacturers have provided modifications into the grid project in order to decrease battery grid weight as well as to reduce the production costs, and to increase the battery life-time cycle and the corrosion-resistance. The performance of lead-acid batteries in automotive applications can significantly be affected by temperature variation. The aim of this study was to evaluate the effects of the microstructural morphology of a Pb-6.6wt%Sb alloy under conditions of hot corrosion. A water-cooled unidirectional solidification system was used to obtain coarse and fine dendritic microstructures. Electrochemical impedance spectroscopy (EIS) diagrams, potentiodynamic polarization curves and an equivalent circuit analysis were used to evaluate the corrosion behavior of fine and coarse dendritic samples in a 0.5M H2SO4 solution in three different working temperatures. It was found that independently of the working temperature, samples with finer dendritic microstructures provide better corrosion resistance than coarser ones, which is an indication that the former microstructural pattern may provide a higher battery life-time in severe temperatures than a coarser one.

10.4028/www.scientific.net/msf.595-598.851

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Citations (9)

The effects of Zn segregation and microstructure length scale on the corrosion behavior of a directionally solidified Mg-25 wt.%Zn alloy

Journal of Alloys and Compounds (2017)

Nathália Carolina Verissimo Emmanuelle S. Freitas Noé Cheung Amauri Garcia Wislei R. Osório

Equiaxed crystals

Galvanic cell

Galvanic corrosion

10.1016/j.jallcom.2017.06.199

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Citations (47)