Rolling Direction Dependent Diffusion Coefficients of Hydrogen in Ferritic Steel by SDCM Charging and SKP Probing

Schimo, Gabriela; Burgstaller, Wolfgang; Hassel, Achim Walter

doi:10.2355/isijinternational.isijint-2015-382

Cited by 7 publications

(4 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[13,14] Improved electrical conductivity was found for Zr doped ZnO. [15] The Scanning Kelvin Probe (SKP) method is a valuable tool for investigating the work function, [16] charge carrier density, [17] local hydrogen content and diffusion coefficient density, [18][19] and even the surface photovoltage. [20] Numerous studies of using the Kelvin method for probing doped materials have already been carried out with the closely related Scanning Kelvin Probe-Force Microscopy (SKP-FM).…”

Section: Introductionmentioning

confidence: 99%

Structural, Electrical, and Optical Effects of Metal Doping on ZnO Thin Films

Huber

Mardare

Kleber

et al. 2019

Physica Status Solidi (a)

Self Cite

View full text Add to dashboard Cite

Doped ZnO thin films are prepared by reactive co‐sputtering of ZnO and a metal (Mn, Ti, W, and Zr). Structural and morphological analysis is done by means of SEM/EDX, XRD, and AFM. Electrical properties in terms of Volta potential are determined via Scanning Kelvin Probe (SKP), UV–VIS spectroscopy is employed to investigate optical properties. Band gaps Eg are obtained using Tauc plots. Doping of ZnO led to significant differences regarding structural, electrical, and optical properties. Morphology of doped ZnO tends to be smoother and more compact, as compared to the pristine ZnO. XRD measurements proved that W doped ZnO films exhibit an amorphous structure, whereas a secondary phase present in the Mn doped ZnO is strongly suggested. W and Mn as dopants lead also to special band gap positions in UV spectroscopy. W:ZnO exhibits a higher value for Eg whereas band gaps of Ti:ZnO and Zr:ZnO are similar to pristine ZnO. For Mn:ZnO two band gaps can be obtained. One is slightly higher and the other one is significantly lower than the one of pristine ZnO. Volta potential doubled when ZnO is doped with W, Zr, or Ti as compared to the pristine ZnO. Mn doped ZnO resulted in a lower Volta potential than pristine ZnO.

show abstract

Section: Introductionmentioning

confidence: 99%

Structural, Electrical, and Optical Effects of Metal Doping on ZnO Thin Films

Huber

Mardare

Kleber

et al. 2019

Physica Status Solidi (a)

Self Cite

View full text Add to dashboard Cite

show abstract

“…In that regard, spectroscopic methods like Raman spectroscopy, (photoelastically modulated) infrared reflection absorption spectroscopy (IRRAS) or even vibrational sum frequency spectroscopy have proven to be valuable tools for the investigation of the chemical composition of corroded surfaces. Electrochemical changes are monitored in situ using scanning Kelvin probe . The activation of the surfaces as well as the formation of anodic and cathodic spots can be visualized by a spatial mapping of the contact potential difference (CPD).…”

Section: Introductionmentioning

confidence: 99%

In Situ Mass Spectrometric Reaction Monitoring of Atmospheric Corrosion Processes

Hölzl

Schimo

Luckeneder

et al. 2018

Physica Status Solidi (a)

Self Cite

View full text Add to dashboard Cite

A set-up for in situ mass spectrometric reaction monitoring of gas phase mediated reactions is presented. Important constructive parameters for a reaction chamber for the investigation of atmospheric corrosion processes is discussed. The presented cell is especially well suited for atmospheric corrosion studies but it can easily be modified to be applicable in other fields of research as well. The atmospheric corrosion of electrolytically deposited zinc surfaces on steel during wet-and dry-cycles is investigated as a model reaction. Corrosion rates as well as current densities during the first wet-and dry cycle are calculated and discussed. Complementary scanning Kelvin probe (SKP) measurements are performed to show the electrochemical changes occurring at the metal/air-interface throughout the corrosion process. Contact potential difference versus distance measurements performed in advance to determine the maximum measurement distance, which allows investigating rough salt loaded sample surfaces via SKP surface scans.

show abstract

“…Besides, the impact of self-assembled monolayers on interfacial water adsorption and the general fabrication of reference electrodes applicable in dry environment are described. The latter aspect might be of great interest for novel Kelvin probe applications, such as hydrogen permeation measurements which have to be carried out in dry nitrogen atmosphere ,, or determination of the oxygen reduction reaction at buried interfaces by Kelvin probe and for FKP applications…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Robust Reference Tips and Reference Electrodes for Kelvin Probe Applications in Changing Atmospheres

et al. 2017

View full text Add to dashboard Cite

The scanning Kelvin probe (SKP) is a versatile method for the measurement of the Volta potential difference between a sample and the SKP-tip (Δψ). Based on suitable calibration, this technique is highly suited for the application in corrosion science due to its ability to serve as a very sensitive noncontact and nondestructive method for determining the electrode potential, even at buried interfaces beneath coatings or on surfaces covered by ultrathin electrolyte layers, which are not accessible by standard reference electrodes. However, the potential of the reference (i.e., the SKP-tip) will be influenced by variations of the surrounding atmosphere, resulting in errors of the electrode potential referred to the sample. The objective of this work is to provide a stable SKP-tip which can be used in different or changing atmosphere, e.g., within a wide range of relative humidity (approximately 0-99%-rh) or varying O partial pressure, without showing a change of its potential (note that the work functions measured in non-UHV atmospheres are electrochemical in nature [Hausbrand et al. J. Electrochem. Soc. 2008, 155 (7), C369-C379], and hence in the following we will refer to the potential of the SKP-tip instead of its work function). In that regard, the SKP-tip is in a first approach modified with self-assembled monolayers (SAMs) in order to create a hydrophobic barrier between the metallic surface and the surrounding atmosphere. The changes in potential upon varying relative humidity (ΔE) of different bare metallic substrates are quantified, and it is shown that these potential differences cannot be minimized by SAMs. On the contrary, the ΔE increases for every examined material system modified with SAMs. The major explanation for this observation is the dipole layer at the interface metal|SAM, causing an interfacial adsorption of water molecules even in a preferred orientation of their dipole moments, which leads to a changed work function and consequently to the correlated electrode potential. However, thin paraffin coatings were found to lead to a strongly reduced ΔE, finally validated with novel robust Ag/Ag reference electrodes. It is also shown that nickel as SKP-tip material is seemingly more stable in varying atmospheric conditions compared to widely used Ni/Cr, stainless steel, or gold as SKP-tip material.

show abstract

Rolling Direction Dependent Diffusion Coefficients of Hydrogen in Ferritic Steel by SDCM Charging and SKP Probing

Cited by 7 publications

References 35 publications

Structural, Electrical, and Optical Effects of Metal Doping on ZnO Thin Films

Structural, Electrical, and Optical Effects of Metal Doping on ZnO Thin Films

In Situ Mass Spectrometric Reaction Monitoring of Atmospheric Corrosion Processes

Fabrication of Robust Reference Tips and Reference Electrodes for Kelvin Probe Applications in Changing Atmospheres

Contact Info

Product

Resources

About