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Special Issue "Corrosion Inhibitors and Protective Coatings"

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A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: 30 September 2023 | Viewed by 2795

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Special Issue Editors

Dr. Peng Han

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Guest Editor

Department of Materials Science and Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Interests: corrosion inhibition; theoretical calculation; inhibitor-coating system

Dr. Haobo Yu
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Guest Editor

Department of Materials Science and Engineering, China University of Petroleum, Beijing 100089, China
Interests: corrosion; inhibition; simulation

Dr. Huiwen Tian

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Guest Editor

State Key Laboratory of Corrosion and Antifouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Interests: nanomaterials; intelligent coating; marine corrosion
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Dr. Yujie Qiang

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Guest Editor

National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
Interests: corrosion inhibitor; anti-corrosion coatings; 2D materials; hybrid multifunctional nanomaterials; self-assembled film; electrochemistry; molecular modeling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The Special Issue aims to shed light on the recent progress and advances in the usage of engineered corrosion inhibitors and protective coatings to protect metallic materials against corrosion in different corrosive environments. We will prioritize the publication of studies related to the following research content, but the Special Issue will not be limited to these aspects:

Design, preparation and performance evaluation;
Advanced test technology and research methods;
Mechanism of action and failure analysis;
Research on sterilization and scale resistance properties;
Research on new corrosion inhibitors such as nanomaterials and plant extracts;
Advanced intelligent coatings;
Research on the mechanism of corrosion coatings;
Research on the application of corrosion inhibitors or coatings in oil, chemical industry, electric power, transportation and other fields.

Dr. Peng Han
Dr. Haobo Yu
Dr. Huiwen Tian
Prof. Dr. Yujie Qiang
Guest Editors

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. Applied Sciences 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 2300 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

environment-friendly
corrosion
interface
inhibition
coating

Published Papers (4 papers)

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Research

Open AccessArticle

A Combination of Laboratory Testing, RCE, and Corrosion Loop for Inhibitor Selection

Gustavo Luis Bianchi

Verónica Acosta

and

Carlos Seijas

Appl. Sci. 2023, 13(7), 4586; https://doi.org/10.3390/app13074586 - 04 Apr 2023

Viewed by 585

Abstract

Corrosion inhibitors are evaluated in the oil industry with electrochemical tests of resistance to linear polarization with rotating cylinders following ASTM G170 and NACE 3T199 standards. With these tests, we can determine the corrosion rate (CR) and efficiency of corrosion inhibitors. In this work, a corrosion test protocol used by hydrocarbon-producing companies for the testing of corrosion inhibitors was used. This protocol consists of a 1045 carbon steel working electrode in a NACE solution composed of 9.62% NaCl, 0.45% CaCl₂, 0.19% MgCl₂, and 89.74% H₂O, at a temperature of 65 °C and saturated with CO₂. Each inhibitor tested was subjected to a series of 6000-4000-2000-4000-6000 rpm tests using rotating cylinder electrodes (RCEs). These electrochemical studies were carried out with the rotating cylinder to evaluate the ability of the inhibitor to prevent the corrosion of carbon steel in the presence of a centrifugal force. In our opinion, this test does not provide corrosion engineers with enough information to be used as a predictive tool, since what is obtained is the CR in a very short testing time. This document proposes the use of two more appropriate test methodologies, the rotating cylinder electrode (RCE) and the flow loop (FL), to evaluate the performance of the corrosion inhibitor. For the FL, the selected flow rate was 1.2 m/s, the same rate that fluids have in oil company pipelines installed in Neuquén, Argentina. Firstly, according to the company’s protocol, inhibitors are required to have an efficiency greater than or equal to 90% in RCE tests; therefore, inhibitors that meet these requirements were tested in the FL test. Unlike the RCE test, the FL test represents the experimental conditions of the laboratory that are closest to reality, for the evaluation of the performance of the inhibitors used in the pipelines of the oil and gas industry. FL tests have several problems involving corrosion, erosion, abrasion, biphasic fluids, the time it takes for the inhibitor to become effective, and the duration of its effectiveness. Full article

(This article belongs to the Special Issue Corrosion Inhibitors and Protective Coatings)

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Open AccessArticle

Corrosion Behavior of Stainless Steel in Seawater in the Presence of Sulfide

and

Appl. Sci. 2023, 13(7), 4366; https://doi.org/10.3390/app13074366 - 29 Mar 2023

Viewed by 758

Abstract

The effect of temperature (from 288 to 308 K) and concentration of sulfide ions (up to 40 ppm) on the corrosion behavior of AISI 304L and AISI 316L stainless steels in seawater was studied with measurements of open-circuit potential, linear and potentiodynamic polarization, and electrochemical impedance spectroscopy. An increase in temperature and pollutant concentration negatively affects the corrosion stability of stainless steels at the open circuit (the resistance, compactness, and thickness of the surface layer decrease and the corrosion current increases), in the passive region (the passivation current increases, the depassivation potential decreases, and the passive potential region narrows), and in the transpassive potential region (the rate of metal dissolution increases). The occurrence of pitting corrosion on the surface of the samples was confirmed with optical microscopy and a non-contact 3D profilometer. A few large pits (depth 80–100 μm and width 100 μm) were formed on the surface of AISI 304L steel, while several smaller pits (depth 40–50 μm and width 50 μm) were formed on the surface of AISI 316L steel. With increasing temperature and sulfide ion concentration, the width, depth, and density of the pits increased on both steel samples. In the studied temperature and concentration range of sulfide ions, the AISI 316L steels exhibited higher corrosion resistance. Overall, the influence of sulfide ions on steel corrosion was more pronounced than the influence of temperature. Full article

(This article belongs to the Special Issue Corrosion Inhibitors and Protective Coatings)

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Open AccessArticle

The Inhibition Effect and Mechnism of a Thiadiazole Derivative on Q235 Carbon Steel in 1 M HCl Solution

and

Appl. Sci. 2023, 13(4), 2103; https://doi.org/10.3390/app13042103 - 06 Feb 2023

Viewed by 353

Abstract

N,N-dihydroxyethyl-(5-methyl-[1,3,4] thiadiazol-2-sulfur)-carbonyl acetamide was synthesized and used as an inhibitor to protect Q235 carbon steel in a 1 M HCl solution. The results showed an increased inhibition efficiency with the increase in the concentration of this inhibitor, and an inhibition efficiency higher than 96% at 40 mg/L can be obtained from weight loss, electrochemical impedance spectroscopy, and potentiodynamic polarization results. The inhibition effect was determined by the adsorption film according to the surface morphology and elemental distribution of the carbon steel surface. The adsorption consists of physical adsorption and chemical adsorption in view of the free adsorption energy of −40.64 kJ/mol derived from the Langmuir adsorption isotherm line. The lone pair electrons of N, O and S and π electronics of double bonds in molecules form stable covalent coordination bonds with the empty d orbitals of iron atoms, which is beneficial to chemical adsorption of the inhibitor. The high inhibiton efficiency of this inhibitor is important for the potential application in pickling field. Full article

(This article belongs to the Special Issue Corrosion Inhibitors and Protective Coatings)

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Open AccessCommunication

Improving the Coatability of Zn–Mg–Al Alloy on Steel Substrate by the Surface Pretreatment of SnCl₂-Added Zinc Ammonium Chloride

Ki-yeon Kim

Srinivasulu Grandhi

and

Min-Suk Oh

Appl. Sci. 2023, 13(2), 950; https://doi.org/10.3390/app13020950 - 10 Jan 2023

Cited by 2 | Viewed by 656

Abstract

The applicability of galvanized products in various industries has increased the demand for highly corrosion-resistant coatings to counter harsh environments. Among these, Zn–Mg–Al ternary alloy coatings have excellent corrosion resistance, resulting in their commercialization and industrial demand. To increase the diversification of their products, the ideal flux composition in these coatings should be optimized. In this study, we investigated the effects of conventional flux (ZnCl₂:NH₄Cl) in the hot-dip galvanization of Zn–Mg–Al ternary alloy coatings. Additionally, we developed a new flux to improve the coating properties of Zn–Mg–Al ternary alloy coatings on steel sheets. During hot dipping, SnCl₂ on the steel substrate decomposed faster than conventional flux, thereby eliminating the AlCl₃ residues in the coating and surface defects. The thermogravimetric-differential thermal analysis studies unveiled the mechanisms for improved coatings. The thermodynamic calculations confirmed the spontaneous substitution owing to the presence of SnCl₂ in the flux. Therefore, the developed and optimized flux enhanced the adhesion of the alloy coating. Full article

(This article belongs to the Special Issue Corrosion Inhibitors and Protective Coatings)

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