scholarly journals Application of AFM-Based Techniques in Studies of Corrosion and Corrosion Inhibition of Metallic Alloys

2020 ◽  
Vol 1 (3) ◽  
pp. 345-372
Author(s):  
Kiryl Yasakau
Keyword(s):  
Metallic Materials ◽  
Kelvin Probe ◽  
Force Microscopy ◽  
Atomic Force ◽  
Current State ◽  
Corrosion Susceptibility ◽  
Corrosion Mechanisms ◽  
Microscopy Techniques ◽  
Corrosion Research

In this review several scanning probe microscopy techniques are briefly discussed as valuable assets for corrosionists to study corrosion susceptibility and inhibition of metals and alloys at sub-micrometer resolution. At the beginning, the review provides the reader with background of atomic force microscopy (AFM) and related techniques such as scanning Kelvin probe force microscopy (SKPFM) and electrochemical AFM (EC-AFM). Afterwards, the review presents the current state of corrosion research and specific applications of the techniques in studying important metallic materials for the aircraft and automotive industries. Different corrosion mechanisms of metallic materials are addressed emphasizing the role of intermetallic inclusions, grain boundaries, and impurities as focal points for corrosion initiation and development. The presented information demonstrates the importance of localized studies using AFM-based techniques in understanding corrosion mechanisms of metallic materials and developing efficient means of corrosion prevention.

Micro-Abrasion-Corrosion Mapping of Bio-Materials: Some New Perspectives

2005 ◽  
Author(s):  
M. M. Stack ◽  
J. Rodling ◽  
M. T. Mathew
Keyword(s):  
Interactive Effects ◽  
Corrosion Mechanism ◽  
Atomic Force ◽  
Recent Developments ◽  
Corrosion Mechanisms ◽  
Microscopy Techniques ◽  
Ultra High Molecular Weight ◽  
Electrochemical Potentials ◽  
Tribological Parameters

Recent developments in the studies of micro-abrasion have resulted in the construction of mechanistic maps where the change in micro-abrasion is presented as a function of the main tribological parameters. However, in many practical situations where micro-abrasion occurs, the environment tends to be corrosive. In such cases, the interaction of micro-abrasion and corrosion is of interest because the combined interaction may lead to “synergistic” or “antagonistic” effects, where corrosion may have a deleterious or beneficial effect in modifying the mechanical properties of the surface. In this paper, the micro-abrasion of a Co-Cr specimen against an ultra high molecular weight polyethylene (UHMWPE) ball was studied in Ringers solution. The effects of applied load at a range of electrochemical potentials were investigated. Atomic force and scanning electron microscopy techniques were used to identify the extent of wear and the role of the corrosion film on the micro-abrasion rate enabling the various wear, corrosion and the interactive effects to be evaluated for the system. The results showed that various micro-abrasion-corrosion mechanisms could be identified in active and passive conditions. These were used to generate micro-abrasion-corrosion mechanism maps showing the change in mechanism as functions of load and applied potential and the extent of interaction between the wear and the corrosion processes was demonstrated on such maps. Possible uses of the generic form of these maps to identify micro-abrasion-corrosion mechanisms in other bio-medical applications are addressed in this paper.

scholarly journals Review of time-resolved non-contact electrostatic force microscopy techniques with applications to ionic transport measurements

2019 ◽  
Vol 10 ◽  
pp. 617-633 ◽  
Author(s):  
Aaron Mascaro ◽  
Yoichi Miyahara ◽  
Tyler Enright ◽  
Omur E Dagdeviren ◽  
Peter Grütter
Keyword(s):  
Atomic Force Microscopy ◽  
Electrostatic Force ◽  
Oscillation Period ◽  
Electrostatic Force Microscopy ◽  
Time Varying ◽  
Time Resolved ◽  
Battery Materials ◽  
Force Microscopy ◽  
Atomic Force ◽  
Microscopy Techniques

Recently, there have been a number of variations of electrostatic force microscopy (EFM) that allow for the measurement of time-varying forces arising from phenomena such as ion transport in battery materials or charge separation in photovoltaic systems. These forces reveal information about dynamic processes happening over nanometer length scales due to the nanometer-sized probe tips used in atomic force microscopy. Here, we review in detail several time-resolved EFM techniques based on non-contact atomic force microscopy, elaborating on their specific limitations and challenges. We also introduce a new experimental technique that can resolve time-varying signals well below the oscillation period of the cantilever and compare and contrast it with those previously established.

scholarly journals Quantification of electron accumulation at grain boundaries in perovskite polycrystalline films by correlative infrared-spectroscopic nanoimaging and Kelvin probe force microscopy

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Ting-Xiao Qin ◽  
En-Ming You ◽  
Mao-Xin Zhang ◽  
Peng Zheng ◽  
Xiao-Feng Huang ◽  
...  
Keyword(s):  
Solar Cell ◽  
Grain Boundaries ◽  
Cell Performance ◽  
Kelvin Probe Force Microscopy ◽  
Light Illumination ◽  
Kelvin Probe ◽  
Solar Cell Performance ◽  
Force Microscopy ◽  
Infrared Spectroscopic

AbstractOrganic–inorganic halide perovskites are emerging materials for photovoltaic applications with certified power conversion efficiencies (PCEs) over 25%. Generally, the microstructures of the perovskite materials are critical to the performances of PCEs. However, the role of the nanometer-sized grain boundaries (GBs) that universally existing in polycrystalline perovskite films could be benign or detrimental to solar cell performance, still remains controversial. Thus, nanometer-resolved quantification of charge carrier distribution to elucidate the role of GBs is highly desirable. Here, we employ correlative infrared-spectroscopic nanoimaging by the scattering-type scanning near-field optical microscopy with 20 nm spatial resolution and Kelvin probe force microscopy to quantify the density of electrons accumulated at the GBs in perovskite polycrystalline thin films. It is found that the electron accumulations are enhanced at the GBs and the electron density is increased from 6 × 1019 cm−3 in the dark to 8 × 1019 cm−3 under 10 min illumination with 532 nm light. Our results reveal that the electron accumulations are enhanced at the GBs especially under light illumination, featuring downward band bending toward the GBs, which would assist in electron-hole separation and thus be benign to the solar cell performance.

The Combined Effect of Chemical and Structural Factors on Pitting Corrosion Induced by MnS-(Cr, Mn, Al)O Duplex Inclusions

CORROSION ◽  
10.5006/2581 ◽  
2017 ◽  
Vol 74 (3) ◽  
pp. 312-325 ◽  
Author(s):  
Cheng Man ◽  
Chaofang Dong ◽  
Kui Xiao ◽  
Qiang Yu ◽  
Xiaogang Li
Keyword(s):  
Pitting Corrosion ◽  
Selective Dissolution ◽  
Dissolution Mechanism ◽  
Structural Factors ◽  
Metal Interface ◽  
Kelvin Probe ◽  
Force Microscopy ◽  
Atomic Force ◽  
The Individual

In situ atomic force microscopy, scanning Kelvin probe force microscopy, and potential pulse technology were used to study the pitting behavior induced by inclusions in AM355 martensitic stainless steel. The MnS-(Cr, Mn, Al)O duplex inclusion exhibited the highest sensitivity to the pitting corrosion with respect to the individual MnS and (Cr, Mn, Al)O inclusions. When exposed to a solution containing Cl−, the selective dissolution occurred on the sulfide segment of the duplex inclusion, leading to trenching along the oxide part. The dissolution mechanism of MnS segment in the duplex inclusion is similar to the individual MnS inclusion. The Cr depletion in the boundary layer at the inclusion/metal interface promoted the transition from metastable to stable pitting corrosion in the duplex inclusion.

The role of cross-linking in the scratch resistance of organic coatings: An investigation using Atomic Force Microscopy

Wear ◽  
2019 ◽  
Vol 418-419 ◽  
pp. 151-159 ◽  
Author(s):  
Juan F. Gonzalez-Martinez ◽  
Erum Kakar ◽  
Stefan Erkselius ◽  
Nicola Rehnberg ◽  
Javier Sotres
Keyword(s):  
Atomic Force Microscopy ◽  
Scratch Resistance ◽  
Organic Coatings ◽  
Cross Linking ◽  
Force Microscopy ◽  
Atomic Force

Determination of the Physical Properties of Oil Sands Components using Scanning Probe Microscopy

2015 ◽  
Vol 1754 ◽  
pp. 69-74
Author(s):  
Ravi Gaikwad ◽  
Tinu Abraham ◽  
Aharnish Hande ◽  
Fatemeh Bakhtiari ◽  
Siddhartha Das ◽  
...  
Keyword(s):  
Oil Sands ◽  
Structural Changes ◽  
Rational Approach ◽  
Kelvin Probe ◽  
Scanning Calorimetry ◽  
Probe Microscopy ◽  
Kelvin Probe Microscopy ◽  
Force Microscopy ◽  
Atomic Force

ABSTRACTAtomic force microscopy is employed to study the structural changes in the morphology and physical characteristics of asphaltene aggregates as a function of temperature. The exotic fractal structure obtained by evaporation-driven asphaltene aggregates shows an interesting dynamics for a large range of temperatures from 25°C to 80°C. The changes in the topography, surface potential and adhesion are unnoticeable until 70°C. However, a significant change in the dynamics and material properties is displayed in the range of 70°C - 80°C, during which the aspahltene aggregates acquire ‘liquid-like’ mobility and fuse together. This behaviour is attributed to the transition from the pure amorphous phase to a crystalline liquid phase which occurs at approximately 70°C as shown by using Differential Scanning Calorimetry (DSC). Additionally, the charged nature of asphaltenes and bitumen is also explored using kelvin probe microscopy. Such observations can lead to the development of a rational approach to the fundamental understanding of asphaltene aggregation dynamics and may help in devising novel techniques for the handling and separation of asphaltene aggregates using dielectrophoretic methods.

scholarly journals Morphometric characterization of fibrinogen's αC regions and their role in fibrin self-assembly and molecular organization

Nanoscale ◽  
2017 ◽  
Vol 9 (36) ◽  
pp. 13707-13716 ◽  
Author(s):  
Anna D. Protopopova ◽  
Rustem I. Litvinov ◽  
Dennis K. Galanakis ◽  
Chandrasekaran Nagaswami ◽  
Nikolay A. Barinov ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Self Assembly ◽  
Molecular Organization ◽  
Microscopy Imaging ◽  
Force Microscopy ◽  
Atomic Force ◽  
Atomic Force Microscopy Imaging ◽  
Morphometric Characterization

High-resolution atomic force microscopy imaging reveals the role of fibrinogen αC regions in the early stages of fibrin self-assembly.

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