A5039806500- Corrosion Behavior and Inhibition
- Magnesium Alloys: Properties and Applications
- Aluminum Alloy Microstructure Properties
- Hydrogen embrittlement and corrosion behaviors in metals
- Aluminum Alloys Composites Properties
- Anodic Oxide Films and Nanostructures
- Electrodeposition and Electroless Coatings
- Concrete Corrosion and Durability
- Electrocatalysts for Energy Conversion
- Nanoporous metals and alloys
- Engineering Diagnostics and Reliability
- Advanced Materials Characterization Techniques
- Educational Philosophies and Pedagogies
- Conducting polymers and applications
- Bone Tissue Engineering Materials
- Welding Techniques and Residual Stresses
- Hydrogen Storage and Materials
- Metal and Thin Film Mechanics
- Electrochemical Analysis and Applications
- Fuel Cells and Related Materials
- Metallic Glasses and Amorphous Alloys
- Non-Destructive Testing Techniques
- Advanced Welding Techniques Analysis
- CO2 Reduction Techniques and Catalysts
- Microstructure and Mechanical Properties of Steels
Universidade Federal do ABC
2017-2024
Universidade Federal de Santa Catarina
2023
The aim of the present work was to study passive film stability and pitting corrosion behavior AISI 409 stainless steel. electrochemical tests were carried out in 0.1 M NaCl solution at room temperature. general assessed using impedance spectroscopy (EIS) measurements whereas semiconducting properties evaluated by Mott-Schottky approach. Pitting investigated potentiodynamic potentiostatic polarization tests. Surface morphology examined confocal laser scanning microscopy electron (SEM)....
This work investigates the effect of current density on surface chemistry, film morphology, cytotoxic response, global and local electrochemical behaviors AZ31B alloy anodized in 1.0 M NaOH + 0.5 Na2SiO3 solution. Three different densities, namely 5, 10 20 mA cm−2 were tested. The morphology thickness layers examined by scanning electron microscopy. chemical states assessed X-ray photoelectron spectroscopy. corrosion resistance was evaluated phosphate-buffered saline (PBS) based impedance...
In this work, scanning electrochemical microscopy (SECM) measurements were employed to characterize the activities on polished and as‐received surfaces of 2098‐T351 aluminum alloy (AA2098‐T351). The effects near surface deformed layer (NSDL) its removal by polishing evaluated compared use different modes SECM. Confocal laser (CLSM) electron (SEM) also morphology surfaces. chemistry was analyzed X‐ray photoelectron spectroscopy (XPS). generation/tip collection (SG/TC) competition SECM used...
The aim of the present work was to investigate effect anodization on fatigue and corrosion-fatigue behavior AZ31B magnesium alloy. Samples were anodized in constant current density mode at 20 mA cm−2 for 5 min room temperature, an environmentally friendly electrolyte consisting a mixture sodium hydroxide silicate. Fatigue tests conducted air phosphate buffer solution (PBS) temperature tension-tension mode, frequency Hz stress ratio 0.1. S-N curves obtained polished samples. Fracture surface...
In this work, composite Ni–P-multiwalled carbon nanotube films were produced by electroless deposition. The main goal was to investigate the influence of multiwalled loading on local electrochemical behavior films, as probed scanning microscopy (SECM). coatings also characterized with respect their crystalline structure, surface, and cross-section morphologies. Adhesion strength examined scratch tests. global evaluated potentiodynamic polarization. activity investigated probing Fe2+...
The AZ91D magnesium alloy was immersed in 3.5 wt.% NaCl solution at room temperature for times ranging from 1 minute up to 72 hours. aim investigate the evolution of corrosion process using confocal laser scanning microscopy (CLSM), electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy. microstructure as-received initially characterized by optical electron (SEM). crystalline phases were identified diffractometry. main primary- α , eutectic- β (Mg 17 Al 12 ). Vickers...
The aim of the present work was to investigate effect treatment time on surface chemistry and corrosion behavior cerium-based chemical conversion coatings AZ91D magnesium alloy. coating prepared by immersion technique from a bath consisting 0.05 mol.L-1 Ce(NO3)3.6H2O 0.254 H2O2 (30 wt.%) for times ranging 20 s 120 s. examined X-ray photoelectron spectroscopy (XPS). assessed electrochemical impedance potentiodynamic polarization. XPS analysis detected presence cerium oxides (Ce2O3 CeO2)...
In this work, scanning electrochemical microscopy (SECM) was employed to study the corrosion behavior of anodized AZ31B magnesium alloy exposed simulated body fluid. SECM measurements were carried out in surface generation/tip collection mode. The hydrogen evolution flux caused during oxidized at ultra-microelectrode (UME). Thus, experimental procedure allowed evaluating effect anodic protection from analysis Z- approximation curves, cyclic voltammograms and topographic maps. results...
AbstractThe surface chemistry and corrosion behavior of Al 85 Ni 9 Ce 6 melt‐spun ribbons were studied after the first hours immersion in 3.5‐wt% NaCl solution at room temperature. X‐ray photoelectron spectroscopy (XPS) was used to assess chemical states Al, Ce, Ni, O. Electrochemical impedance resistance ribbons. The alloy remained immersed for up 48 hours. results showed that hydroxide species passive film play a central role alloy.
In the present work, corrosion properties and surface chemistry of a graphene oxide-coated AZ91D alloy were investigated. The coatings deposited on substrate specimens by immersion in solutions with GO concentrations 0.05% 0.1% (m/v). An intermediate silane layer was firstly obtained to improve adhesion between films substrate. electrochemical behavior coated assessed using impedance spectroscopy potentiodynamic polarization curves 3.5 wt.% NaCl solution. X-ray photoelectron (XPS). consisted...
Background: The corrosion rate of biomedical magnesium alloys must be controlled to avoid excessive degradation in the physiological medium. Conversion coatings produced fluoride-based electrolytes can employed as a suitable protection route for these materials. use concentrated HF solutions is most common procedure current literature. aim present work was employ less solution produce protective films on AZ31B alloy and investigate effect treatment time its resistance. Methods: were obtained...
Background: Pipeline steels such as the API 5L X80 grade can be subjected to corrosion in contact with either acidic or alkaline sour brines. The surfaces oxides formed each case have a protective non-protective character against corrosion. This behavior is not understood and gives rise conflicting reports literature. aim of present work was investigate electrochemical response anodic films by cyclic voltammetry on surface pipeline steel. Keywords: Cyclic voltammetry, impedance spectroscopy,...
Investigations have been performed to study the effects of electrolyte composition on properties anodized films grown AZ31B magnesium alloy. The corrosion protection ability oxide layers was explored by using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy. Film morphology examined scanning electron microscopy confocal laser microscopy. In spite its higher roughness average, film formed in silicate hydroxide mixed solution enhanced protective layer, thus...
The effects of surface finishing on the corrosion behavior and electrochemical activity AA2098-T351 (Al–Cu–Li alloy) were investigated basis correlation between chemistry, microstructure activity. alloy was evaluated in as-received polished conditions. morphology two types surfaces using confocal laser scanning microscopy (CLSM), optical 3D profilometry. chemistry analyzed by X-ray Photoelectron Spectroscopy (XPS) energy dispersive spectroscopy (EDX). Scanning microelectrochemical techniques...