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Film Composition and Characteristics on Non-ferrous Corroded Metals and Alloys

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A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Corrosion".

Deadline for manuscript submissions: closed (20 October 2023) | Viewed by 8378

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Special Issue Editor

Prof. Dr. Herman Potgieter

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School of Chemical and Metallurgical Engineering, Unversity of the Witwatersrand, Private Bag X3, P.O. Wits 2050, South Africa
Interests: corrosion; electrochemistry; electrowinning; water treatment
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Corrosion is a multifaceted degradation phenomenon with wide-ranging consequences in many industries and environments. The corrosion behavior of materials in corrosive media depends critically on the nature of the passive film and corrosion products formed during the corrosion process. In this Special Edition, the emphasis will be on these passive film and corrosion products which form during the corrosion process in aqueous media. Mild steel and stainless steels are popular materials in a number of industries and applications, and their corrosion behavior is often reported. However, there are a wide variety of other non-ferrous metals and alloys, which find application in numerous products and processes. The focus in this Special Edition will be on these different non-ferrous alloys and metals, e.g., titanium, magnesium, and aluminum alloys, copper, brass, and bronze alloys, cermet and metal matrix composites, high-entropy alloys, and any material not containing iron as a major element and the nature and composition of passive film and corrosion products formed on them during any aqueous corrosion process. Information obtained by any surface analysis technique, or combination thereof, which can provide such information and is utilized in the study, can be described.

Prof. Dr. Herman Potgieter
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. Materials is an international peer-reviewed open access semimonthly 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

Non-ferrous alloys and metals
Aqueous corrosion
Passive films
Corrosion products
Surface analysis techniques

Published Papers (5 papers)

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Editorial

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1 pages, 141 KiB

Open AccessEditorial

The Nature of the Passive Layer (and Spalled Corrosion Products) on Nonferrous Alloys in Aqueous Corrosive Media—Editorial

by Herman Potgieter

Materials 2022, 15(6), 2178; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15062178 - 16 Mar 2022

Viewed by 945

Abstract

Mild steel and various stainless steels are the workhorse alloys in construction and process industries, used in a myriad of applications [...] Full article

(This article belongs to the Special Issue Film Composition and Characteristics on Non-ferrous Corroded Metals and Alloys)

Research

Jump to: Editorial

14 pages, 2338 KiB

Open AccessArticle

Effect of Corrosive Media on the Chemical and Mechanical Resistance of IPS e.max^® CAD Based Li₂Si₂O₅ Glass-Ceramics

by Anna Švančárková, Dagmar Galusková, Aleksandra Ewa Nowicka, Helena Pálková and Dušan Galusek

Materials 2022, 15(1), 365; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15010365 - 04 Jan 2022

Cited by 2 | Viewed by 1575

Abstract

The influence of 4% acetic acid (pH~2.4) and an alkaline solution of NaOH (pH~10) on the corrosion resistance and micromechanical properties of disilicate crystals containing glass-ceramics (LS2-GC’s) is studied. Partially crystallized lithium metasilicate crystal containing glass-ceramics (LS-GC’s) are annealed to fully LS2-GC’s using a one stage and a two-stage heating to induce nucleation. Materials with various chemical and wear resistance are prepared. The content of the crystalline phase in the material annealed in the two-stage process A is 60.0% and increases to 72.2% for the material heated in the one-stage process B. The main elements leached in the acidic medium are lithium and phosphorus, while lithium, silicon, and phosphorus leached into the alkaline environment. Material B exhibits better chemical resistance to the corrosive influence of 4% acetic acid under quasi-dynamic conditions. In the alkaline corrosion medium, silicon is leached from material A faster compared to the material B. After prolonged exposure to acidic or basic environments, both materials show evidence of surface structural changes. A decrease of the sliding wear resistance is observed after corrosion in the acidic environment under dynamic conditions. In both materials, the wear rate increases after corrosion. Full article

(This article belongs to the Special Issue Film Composition and Characteristics on Non-ferrous Corroded Metals and Alloys)

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21 pages, 11093 KiB

Open AccessArticle

Electrochemical Corrosion Behaviour of Different Grades of WC-Co, High-Cr White Cast Irons and Hadfield Steel in 1 M Sulphuric Acid

by Johannes H. Potgieter, David Whitefield and Vivian Motsumi

Materials 2021, 14(20), 6130; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14206130 - 15 Oct 2021

Cited by 1 | Viewed by 1630

Abstract

Electrochemical polarisation tests were carried out on three grades of WC-Co cemented carbides to investigate the corrosive behaviour of the hardmetals and rank them as viable protective liners for chutes and skips in the mining industry. The cobalt binder content and WC particle size varied. The binder content ranged from 6–12 wt%, and the grain size of the WC particles ranged from 0.4–2.3 µm. The performance of the WC-Co hardmetal was compared to three different grades of high chromium white cast irons and Hadfield steel. The cast irons varied in both their chromium content and the morphology of the Cr-rich primary carbides. Potentiodynamic polarisation and linear polarization resistance scans were used to determine the corrosion current density and other electrochemical parameters. The microstructural characteristics of the samples were analysed using Scanning Electron Microscope(SEM) with Energy Dispersive Spectroscopy (EDS), and optical microscopy. The potentiodynamic scans revealed that, although the WC-Co alloys were found to have generally improved corrosion resistance, it was the high-Cr white cast iron (22 wt% Cr) that recorded the lowest corrosion current density and therefore displayed the best resistance against corrosive attack in 1 M H₂SO₄. The Hadfield steel exhibited the poorest resistance to corrosion and therefore, suffered the most degradation to its exposed surface. Full article

(This article belongs to the Special Issue Film Composition and Characteristics on Non-ferrous Corroded Metals and Alloys)

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16 pages, 4755 KiB

Open AccessArticle

Corrosion Products Formed on MgZr Alloy Embedded in Geopolymer Used as Conditioning Matrix for Nuclear Waste—A Proposition of Interconnected Processes

by Rémi Boubon, Jaysen Nelayah, Samuel Tardif, Xavier Deschanels and Diane Rébiscoul

Materials 2021, 14(8), 2017; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14082017 - 16 Apr 2021

Cited by 1 | Viewed by 1752

Abstract

Geopolymer has been selected as a hydraulic mineral binder for the immobilization of MgZr fuel cladding coming from the dismantling of French Uranium Natural Graphite Gas reactor dedicated to a geological disposal. In this context, the corrosion processes and the nature of the corrosion products formed on MgZr alloy in a geopolymer matrix with and without the corrosion inhibitor NaF have been determined using a multiscale approach combining in situ Grazing Incidence hard X-ray Diffraction, Raman microspectroscopy, Scanning and Transmission Electron Microscopies coupled to Energy Dispersive X-ray Spectroscopy. The composition, the morphology, and the porous texture of the corrosion products were characterized, and the effect of the corrosion inhibitor NaF was evidenced. The results highlighted the formation of Mg(OH)_2−xF_x. In addition, in presence of NaF, NaMgF₃ forms leading to a decrease of the thickness and the porosity of the corrosion products layer. Moreover, a precipitation of magnesium silicates within the porosity of the geopolymer was evidenced. Finally, we propose a detailed set of interconnected processes occurring during the MgZr corrosion in the geopolymer. Full article

(This article belongs to the Special Issue Film Composition and Characteristics on Non-ferrous Corroded Metals and Alloys)

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16 pages, 6328 KiB

Open AccessEditor’s ChoiceArticle

Evolution of Corrosion Products Formed during the Corrosion of MgZr Alloy in Poral Solutions Extracted from Na-Geopolymers Used as Conditioning Matrix for Nuclear Waste

by Rémi Boubon, Xavier Deschanels, Martiane Cabié and Diane Rébiscoul

Materials 2020, 13(21), 4958; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13214958 - 04 Nov 2020

Cited by 5 | Viewed by 1593

Abstract

Geopolymer, a nanoporous aluminosilicate filled with water and ions, has been selected as a potential matrix to encapsulate MgZr alloy fuel cladding. In this study, we investigate the evolution of the corrosion products formed during the corrosion of MgZr in poral solutions extracted from geopolymers with and without NaF as corrosion inhibitor. Using various characterization techniques such as Scanning Electron and Scanning Transmission Electron Microscopies coupled to Energy Dispersive X-ray spectroscopy and Grazing Incidence X-ray Diffraction, we show that the amounts of dissolved silica and fluoride species in solution are the key parameters driving the nature of corrosion products and probably their passivating properties regarding MgZr corrosion. Full article

(This article belongs to the Special Issue Film Composition and Characteristics on Non-ferrous Corroded Metals and Alloys)

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