A5015391533- Corrosion Behavior and Inhibition
- Hydrogen embrittlement and corrosion behaviors in metals
- Metal and Thin Film Mechanics
- Electrodeposition and Electroless Coatings
- Concrete Corrosion and Durability
- Advanced Machining and Optimization Techniques
- Titanium Alloys Microstructure and Properties
- Smart Materials for Construction
- Anodic Oxide Films and Nanostructures
- Infrastructure Maintenance and Monitoring
- Pigment Synthesis and Properties
- Building materials and conservation
- Advanced oxidation water treatment
- Diamond and Carbon-based Materials Research
- Orthopaedic implants and arthroplasty
- Metallurgical Processes and Thermodynamics
- Underground infrastructure and sustainability
- Bone Tissue Engineering Materials
- Advanced Polymer Synthesis and Characterization
- Microstructure and Mechanical Properties of Steels
- Metallurgy and Material Forming
- Mechanical Failure Analysis and Simulation
- Water Quality Monitoring and Analysis
- Advanced Materials Characterization Techniques
- Dental materials and restorations
Universidade Federal de Minas Gerais
2018-2021
Universidade Federal de Ouro Preto
2018
Serviço Nacional de Aprendizagem Industrial
2013-2016
Universidade Tiradentes
2014
ALcontrol Laboratories
2009
Federal Center for Technological Education of Minas Gerais
2006-2009
Companhia Energética de Minas Gerais (Brazil)
2001
The tribocorrosion behavior of a biocompatible ASTM-F67Gr1 titanium alloy was evaluated. An experimental pin-on-flat reciprocating sliding tribo-electrochemical setup built which allowed the investigation phenomena in an electrolyte Ringer solution. Tests were performed at anodic and cathodic potential, two values applied load speed. Potentiodynamic tests indicated corrosion potential −0.368 ± 0.082 VSCE passivation range between 0.344 2.932 observed. After polarization tests, no pits...
The chemical and structural complexity of soils, coupled with their heterogeneity, contributes to the increase in soil aggressiveness, which can turn result severe corrosion underground materials. understanding corrosive processes structures is important aiding development methods, as well monitoring maintenance, an attempt minimize environmental, social, economic impacts. In this work, electrochemical impedance spectroscopy (EIS) was used monitor process galvanized steel when contact...
The aim of this work was to characterize thin interference films grown on the surface AISI 304 stainless steel for decorative purposes. Films were in a sulphochromic solution at room temperature by an alternating pulse current method. morphology and chemical state elements investigated field emission scanning electron microscopy (FESEM), atomic force (AFM), glow discharge optical spectrometry (GDOES), infrared Fourier transform spectroscopy (FTIR). Depth-sensing indentation (DSI) experiments...
In distribution and transmission electric power companies, many losses risks are associated with corrosive processes that occur in buried structures, such as tower leg foundations of overhead lines. Tower corrosion control at the foundation involves collection analysis data generated by different inspection methods practices for routine maintenance repair. The aim this paper is to demonstrate a methodology developed identify locations towers most susceptible high rates metal legs order...
Anodic interference films were grown on stainless steel by an electrochemical process in a 70 g L −1 CrO 3 +500 H 2 SO 4 solution at temperatures of 25–75°C. The aim this research was to assess the influence temperature characteristics coating. morphology assessed through atomic force microscopy, chemical composition X-ray photoelectron spectroscopy, while mechanical resistance abrasion wear and nanohardness. roughness 25°C is less than that other temperatures. No significant difference...
The motivation of this work is to compare methods for nanotube formation in α-Ti with the results obtained β-TiNi by electrochemical anodization at same conditions. Both substrates were characterized XRD assure their phase constitution room temperature. Samples anodized 0.2%m. NH4F and 1%v. H2O ethylene glycol solvent 5, 15, 25, 45, 60 V. Each experimental condition had its current densities recorded as a function time resultant anodic films FE-SEM. All conditions lead Ti substrates. TiNi...
Em função da crescente demanda de utilização do aço inoxidável, na arquitetura, como material revestimento externo e, considerando a preocupação dos órgãos controle ambiental com poluição no meio urbano, foram avaliados os efeitos chuva ácida nas condições superficiais inoxidável colorido e lixiviação cromo para o ambiente. Para esse estudo, realizados, em laboratório, ensaios imersão chapas natural solução simulada ácida, sendo liberação alteração aparência superficial das amostras tempos...
The characterization of architectural coatings grown on the surface AISI 304 stainless steel by an electrochemical coloration process was realized multiple techniques. interference colored were in a sulphochromic solution at room temperature alternating pulse current method. morphology and chemical state elements films investigated field emission scanning electron microscopy (FESEM), atomic force (AFM), glow discharge optical spectrometry (GDOES), infrared Fourier transform spectroscopy...
Interference film deposition is an attractive alternative for the formation of coloured protective layers on surface stainless steel various applications. The process involves growth oxide (chromium and iron oxide), by chemical or electrochemical methods, imparting a colour, which changes from blue to green depending thickness film. aim present investigation was assess wear sliding behaviour steel, produced pulsed process. specimens were obtained using anodic colouring coupled with cathodic...
The influence of temperature on the speed an electrochemical coloration process AISI 304 and 430 stainless steel was investigated in ranging from 25 °C to 40 °C. surface properties interference colored nanofilms obtained both types substrates, were also evaluated. A higher coloring observed for 304. time obtain a gold color decreased with increasing steels. This effect stronger substrate, decrease 36.6% samples at Arrhenius model applied estimate equations films growth rate. porous fractions...
Aços inoxidáveis ABNT 304 foram coloridos em dourado pelo método eletroquímico de corrente pulsada utilizando como eletrólito solução ácida concentrações 70 g/L e 250 cromo, a fim investigar influência da concentração cromo na resistência à corrosão ao desgaste por abrasão.A caracterização morfológica dos filmes interferência foi realizada partir imagens adquiridas um Microscópio Força Atômica, as quais quantificadas programa aplicativo análise imagens, para determinação rugosidade...
PDF | O desenvolvimento de combustíveis alternativos com emissões menos nocivas é tema pesquisas em todo o mundo. Além dos combustíveis, materiais mais resistentes à agressividade do meio também são objeto estudo. No tocante a um combustível ecológico álcool uma realidade. Em relação aos utilizados nesse sistema tendência utilização aços inoxidáveis devido as suas propriedades resistência corrosão e características mecânicas. É objetivo deste trabalho observar efeito corrosivo que condensado...
PDF | Neste trabalho, foram realizados estudos sobre o uso de uma solução 2,5M CrO3 + 5,0M H2SO4, utilizada no processo coloração industrial aços inoxidáveis, como eletrolítica para efetuar eletropolimento desses materiais. Foram avaliados os efeitos da temperatura e do tempo polimento a refletância, rugosidade resistência à corrosão inoxidáveis ABNT 304 com acabamento superficial tipo BB (Bright Buffing). Foi observado que realizado ambiente aumentou refletividade aço. A das amostras...
PDF | Aços inoxidáveis ABNT 304 foram coloridos em dourado pelo método eletroquímico de corrente pulsada utilizando como eletrólito solução ácida concentrações 70 e 250g/L cromo, a fim investigar influência da concentração cromo na resistência à corrosão ao desgaste por abrasão. A caracterização morfológica dos filmes interferência foi realizada partir imagens adquiridas um Microscópio Força Atômica, as quais quantificadas programa aplicativo análise imagens, para determinação rugosidade...
Deposition of interference film is an alternative way for the formation colored protective layers on surface stainless steels decorative applications. The process involves growth a chromium oxide by electrochemical methods using in general sulphochromic solutions. However, it well known that chromic acid contains Cr(VI), which highly toxic, demanding special effluent treatments order to avoid environmental pollution. aim present work evaluate free solutions coloration steel method as trial...
Um dos grandes desafios na área de biomateriais é desenvolver implantes que consigam aliar biocompatibilidade e resistência à corrosão. Ligas titânio vêm sendo largamente aplicadas com essa finalidade, uma vez apresentam tais características, além exibirem maior mecânica melhor custo-benefício frente ao puro. Sob perspectiva, este trabalho estudou as condições do processo anodização da liga Ti6Al4V. A caracterização óxido formado foi realizada por microscopia eletrônica varredura (MEV)...