{"title":"New insights into the influence mechanism of carbides on the localized corrosion of N80 carbon steel: Experiments and first-principles study","authors":"","doi":"10.1016/j.vacuum.2024.113682","DOIUrl":null,"url":null,"abstract":"<div><div>Carbides significantly influenced the corrosion behavior of N80 carbon steel. The specific types of carbides and their adsorption behavior at the interface with the steel matrix were particularly complex. This study comprehensively evaluated the impact of carbides on the localized corrosion of N80 steel using both computational and experimental techniques. The findings revealed that the predominant carbides in the steel were Fe<sub>3</sub>C, with a potential difference of approximately 65.3 mV greater than that of the steel matrix, leading to preferential dissolution of the steel matrix. The corrosion film that formed on the steel surface was loose and porous, enriched with Cl-, and insufficient to effectively prevent the penetration of corrosive media. The work function relationship between Fe<sub>3</sub>C and the steel matrix was Fe < Fe<sub>3</sub>C, and O exhibited a higher adsorption energy on the Fe surface than on the Fe<sub>3</sub>C surface. This resulted in a strong galvanic coupling corrosion effect between Fe<sub>3</sub>C and the steel matrix. Fe<sub>3</sub>C, acting as the cathodic phase in the galvanic corrosion process, accelerated the adsorption of O<sub>2</sub> on the steel surface, which in turn led to significant dissolution of the steel matrix. This process facilitated the nucleation of pits, ultimately resulting in the formation of stable pits on the surface.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":null,"pages":null},"PeriodicalIF":3.8000,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Vacuum","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0042207X24007280","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Carbides significantly influenced the corrosion behavior of N80 carbon steel. The specific types of carbides and their adsorption behavior at the interface with the steel matrix were particularly complex. This study comprehensively evaluated the impact of carbides on the localized corrosion of N80 steel using both computational and experimental techniques. The findings revealed that the predominant carbides in the steel were Fe3C, with a potential difference of approximately 65.3 mV greater than that of the steel matrix, leading to preferential dissolution of the steel matrix. The corrosion film that formed on the steel surface was loose and porous, enriched with Cl-, and insufficient to effectively prevent the penetration of corrosive media. The work function relationship between Fe3C and the steel matrix was Fe < Fe3C, and O exhibited a higher adsorption energy on the Fe surface than on the Fe3C surface. This resulted in a strong galvanic coupling corrosion effect between Fe3C and the steel matrix. Fe3C, acting as the cathodic phase in the galvanic corrosion process, accelerated the adsorption of O2 on the steel surface, which in turn led to significant dissolution of the steel matrix. This process facilitated the nucleation of pits, ultimately resulting in the formation of stable pits on the surface.
期刊介绍:
Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences.
A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below.
The scope of the journal includes:
1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes).
2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis.
3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification.
4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.