{"title":"A Study on the Corrosion Resistance of B30 Cu–Ni Alloy in a Simulated Marine Environment Containing NH4+","authors":"S. T. Guo, M. Zhu, Y. F. Yuan, S. Y. Guo","doi":"10.1007/s11665-025-11014-x","DOIUrl":null,"url":null,"abstract":"<div><p>This work investigated the influence of different NH<sub>4</sub>Cl concentrations (0, 10, 50, 100 mg/L) on the corrosion behavior of B30 Cu–Ni alloy in simulated seawater by various tests. The results show that as NH<sub>4</sub>Cl concentration increases, the passivation region shranks, i<sub>p</sub> increases, E<sub>p</sub> decreases and the defect density inside the surface passivation film rises, which demonstrate that the existence of NH<sub>4</sub><sup>+</sup> weakens the corrosion resistance of the alloy. Furthermore, when the NH<sub>4</sub><sup>+</sup> concentration increases to 50 mg/L, a clear transition zone appears, as well as the number and size of pitting increase, indicating that the passivity of B30 alloy is declined, and the pitting degree is heightened. The H<sup>+</sup> caused by hydrolysis of NH<sub>4</sub><sup>+</sup> promotes the passivation film disruption, and impairs its protective performance.</p></div>","PeriodicalId":644,"journal":{"name":"Journal of Materials Engineering and Performance","volume":"34 20","pages":"23059 - 23070"},"PeriodicalIF":2.0000,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Engineering and Performance","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s11665-025-11014-x","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
This work investigated the influence of different NH4Cl concentrations (0, 10, 50, 100 mg/L) on the corrosion behavior of B30 Cu–Ni alloy in simulated seawater by various tests. The results show that as NH4Cl concentration increases, the passivation region shranks, ip increases, Ep decreases and the defect density inside the surface passivation film rises, which demonstrate that the existence of NH4+ weakens the corrosion resistance of the alloy. Furthermore, when the NH4+ concentration increases to 50 mg/L, a clear transition zone appears, as well as the number and size of pitting increase, indicating that the passivity of B30 alloy is declined, and the pitting degree is heightened. The H+ caused by hydrolysis of NH4+ promotes the passivation film disruption, and impairs its protective performance.
期刊介绍：
ASM International''s Journal of Materials Engineering and Performance focuses on solving day-to-day engineering challenges, particularly those involving components for larger systems. The journal presents a clear understanding of relationships between materials selection, processing, applications and performance.
The Journal of Materials Engineering covers all aspects of materials selection, design, processing, characterization and evaluation, including how to improve materials properties through processes and process control of casting, forming, heat treating, surface modification and coating, and fabrication.
Testing and characterization (including mechanical and physical tests, NDE, metallography, failure analysis, corrosion resistance, chemical analysis, surface characterization, and microanalysis of surfaces, features and fractures), and industrial performance measurement are also covered
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