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Metals
Special Issues
Corrosion Electrochemical Measurement, Analysis and Research
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Corrosion Electrochemical Measurement, Analysis and Research

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Corrosion and Protection".

Deadline for manuscript submissions: 30 June 2024 | Viewed by 6228

Special Issue Editor

Prof. Dr. Fahe Cao

E-Mail Website
Guest Editor
School of Materials, Sun Yat-sen University, Guangzhou 510006, China
Interests: corrosion electrochemistry; corrosion; protection of light alloy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Since electrochemical reaction is a fundamental part of the metal corrosion process in the majority of cases, electrochemical measurement and analysis play an extremely important role in corrosion evaluation, monitoring and research based on the mixed potential theory for electrochemical corrosion. Alongside the development of science and technology, increased attention has been paid to scanning microelectrochemical technology, which is also closely related to the initiation and development of corrosion, especially localized corrosion. In addition, it is important to understand corrosion phenomena, study corrosion behavior, and develop corrosion electrochemical monitoring methods from the perspective of electrochemical/chemical reactions. We believe that electrochemical technology is an irreplaceable method for corrosion monitoring and research in the past, present and future.

This Special Issue welcomes articles that focus on the base and application of corrosion electrochemical techniques for metal and coating during corrosion, such as EIS, potential scanning, electrochemical noise, scanning electrochemical probes, etc. Original research articles and reviews are welcome. We look forward to receiving your contributions.

Prof. Dr. Fahe Cao
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • corrosion
  • metal
  • electrochemical measurement
  • EIS
  • polarization
  • electrochemical noise
  • SECM
  • SVET
  • coating

Published Papers (4 papers)

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Research

15 pages, 11318 KiB  
Article
An Online Monitoring Approach of Carbon Steel Corrosion via the Use of Electrochemical Noise and Wavelet Analysis
by Ahmed Abdulmutaali, Yang Hou, Chris Aldrich and Katerina Lepkova
Metals 2024, 14(1), 66; https://doi.org/10.3390/met14010066 - 05 Jan 2024
Viewed by 1210
Abstract
In this study, carbon steel was examined under different corrosive conditions using electrochemical noise (EN) as the primary method of investigation. The corroded carbon steel surfaces were examined using 3D profilometry to gather information about localized defects (pits). A post-EN analysis approach was [...] Read more.
In this study, carbon steel was examined under different corrosive conditions using electrochemical noise (EN) as the primary method of investigation. The corroded carbon steel surfaces were examined using 3D profilometry to gather information about localized defects (pits). A post-EN analysis approach was used using the discrete wavelet transform (DWT) method, which emphasizes the necessity of employing wavelet analysis as a quantitative analysis approach for electrochemical noise. A well-established approach to extract features from wavelet scalogram images, based on the concept of local binary patterns (LBPs), was used to extract features from these wavelet images. The results demonstrated that electrochemical noise associated with wavelet transform analysis, particularly wavelet scalograms, is an effective tool for monitoring the localized corrosion of carbon steel. Full article
(This article belongs to the Special Issue Corrosion Electrochemical Measurement, Analysis and Research)
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12 pages, 4167 KiB  
Article
The Preparation, Corrosion Resistance and Formation Mechanism of a New-Type Mo-Based Composite Conversion Coating on 6061 Aluminum Alloy
by Xuzheng Qian, Feng Huang, Xu Teng, Yiqun Wang, Yingsong Fang, Jingjing Pan, Wenhao Wang, Yingpeng Li and Wen Zhan
Metals 2023, 13(1), 168; https://doi.org/10.3390/met13010168 - 13 Jan 2023
Cited by 1 | Viewed by 1125
Abstract
This paper aims to explore a new-type Mo-based composite conversion coating on 6061 aluminum alloy, systematically evaluate its corrosion resistance, and further reveal the formation mechanism. The effects of pH, conversion time (CTI) and H2ZrF6 content on the corrosion resistance [...] Read more.
This paper aims to explore a new-type Mo-based composite conversion coating on 6061 aluminum alloy, systematically evaluate its corrosion resistance, and further reveal the formation mechanism. The effects of pH, conversion time (CTI) and H2ZrF6 content on the corrosion resistance were determined by the dropping test and electrochemical tests, and the average corrosion rate (ACR) in neutral 3.5 wt.% NaCl solution under different temperatures was calculated by the immersion test. The micro-morphology and phase compositions were systematically investigated by SEM, EDS and XPS. The results showed that the optimal pH and CTI were 4.5 and 12 min respectively, and the most suitable addition amount of H2ZrF6 was 1.2 mL/L. The micro-morphology of the Mo/Ti/Zr conversion coating (MoTiZrCC) under the best conversion condition was relatively smooth and dense, and its phase compositions mainly consisted of MoO3, Mo2O5, TiO2, ZrO2 and Al2O3. The MoTiZrCC could significantly improve corrosion resistance with the lower icorr and higher Rp, and the ACR of the MoTiZrCC could be reduced to 16.7% of the Al alloy matrix. Additionally, based on the above results, the formation mechanism for the MoTiZrCC was logically deduced. Full article
(This article belongs to the Special Issue Corrosion Electrochemical Measurement, Analysis and Research)
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14 pages, 5195 KiB  
Article
Preparation and Characterization of Synchronous Chemical Conversion Coating on 6061 Aluminum Alloy/7075 Aluminum Alloy/Galvanized Steel Substrates
by Wen Zhan, Xinxiang Li, Xuzhen Qian, Yingpeng Li, Yunhu Ding, Yunhe Zu, Fan Xie and Feng Tian
Metals 2022, 12(12), 2011; https://doi.org/10.3390/met12122011 - 23 Nov 2022
Cited by 4 | Viewed by 1361
Abstract
This paper aimed to develop synchronous chemical conversion coating on multi-metal substrates with good corrosion resistance to meet the primer process of new energy light vehicle bodies. Titanium/zirconium-based chemical conversion coatings were prepared on 6061 aluminum alloy/7075 aluminum alloy/galvanized steel substrates. By measuring [...] Read more.
This paper aimed to develop synchronous chemical conversion coating on multi-metal substrates with good corrosion resistance to meet the primer process of new energy light vehicle bodies. Titanium/zirconium-based chemical conversion coatings were prepared on 6061 aluminum alloy/7075 aluminum alloy/galvanized steel substrates. By measuring the open circuit potential (OCP), the formation of a muti-metal synchronous conversion coating can be roughly divided into three steps. Potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques showed that the self-corrosion current density of the conversion coating decreased significantly while the resistance increased. The surface morphology and composition of the conversion coatings were observed by scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). Additionally, the micro-zone characteristics of conversion coatings were analyzed by an electron probe microanalyzer (EPMA). The synchronous conversion coatings exhibit uniformity and relative smoothness. Additionally, a number of tiny cracks, pores, intermetallic compounds, enrichments and inclusions provide efficient active sites for the nucleation of chemical conversion. Consequently, in the synchronous conversion coating, the structure of aluminum alloy mainly consists of Al2O3/TiO2/ZrO2/ZrF4, while the structure of conversion coating of galvanized steel contains TiO2/Fe2O3/ZrO2. Full article
(This article belongs to the Special Issue Corrosion Electrochemical Measurement, Analysis and Research)
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17 pages, 5777 KiB  
Article
Electrochemical Noise Analysis of the X70 Pipeline Steel under Stress Conditions Using Symmetrical and Asymmetrical Electrode Systems
by Andres Carmona-Hernández, Ricardo Orozco-Cruz, Franco Antonio Carpio-Santamaria, Clarisa Campechano-Lira, Francisco López-Huerta, Edgar Mejía-Sánchez, Antonio Contreras and Ricardo Galván-Martínez
Metals 2022, 12(9), 1545; https://doi.org/10.3390/met12091545 - 19 Sep 2022
Cited by 3 | Viewed by 1749
Abstract
In this work, electrochemical monitoring of stress corrosion cracking (SCC) behavior of a X70 steel in acidic synthetic soil solution during the slow strain rate test (SSRT) was performed by electrochemical noise (EN) using the conventional arrangement of symmetrical electrodes and electrochemical emission [...] Read more.
In this work, electrochemical monitoring of stress corrosion cracking (SCC) behavior of a X70 steel in acidic synthetic soil solution during the slow strain rate test (SSRT) was performed by electrochemical noise (EN) using the conventional arrangement of symmetrical electrodes and electrochemical emission spectroscopy (EES) using the asymmetrical arrangement replacing the second working electrode for a platinum micro-cathode. The statistical method, fast Fourier transform, and discrete wavelet transform were used for analyzing the potential and current signals recorded by both arrangements. The results showed that EN arrangement was more effective to detect the crack initiation at a point close to yield strength despite stress-induced asymmetry in one of the electrodes. For the EES arrangement, the micro-cathode had a strong influence on the electrochemical noise of the current and potential under stress conditions. From the transient features, statistical parameters, and wavelet analysis, a discontinuous transgranular SCC mechanism was found. The resistance values obtained by EN measurements had better correlation with the electrochemical impedance spectroscopy results (EIS) than EES measurements. Full article
(This article belongs to the Special Issue Corrosion Electrochemical Measurement, Analysis and Research)
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