{"title":"Enhancing the corrosion inhibition of copper sheets in oil-in-water (O/W) emulsions by combining two organic heterocyclic derivatives","authors":"Xudong Yan, Wenjing Liu, Yang Xu and Sang Xiong","doi":"10.1039/D4RA04757E","DOIUrl":null,"url":null,"abstract":"<p >Copper sheets corrode easily when exposed to oil-in-water (O/W) emulsions during metal-forming processes. The quest for identifying novel, high-efficiency copper inhibitors and realizing the effective protection of copper surfaces from emulsion corrosion has gradually attracted considerable attention. In this study, two organic heterocyclic derivatives, <em>N</em>,<em>N</em>-bis(2-ethylhexyl)-4-methyl-1<em>H</em>-benzotriazol-1-methanamine (NBTAH) and 2,5-bis(octyldithio)-1,3,4-thiadiazole (BTDA), were introduced as copper inhibitors into O/W emulsions. Their corrosion inhibition performance was investigated in-depth using electrochemical measurements, surface characterization, adsorption isotherms and wetting techniques. The results indicated that both inhibitors generated anodic passive films on the copper surface, and thus enhanced the corrosion resistance. The maximum corrosion inhibition efficiency achieved was 94.0% with combination of 5 mM NBTAH and 8 mM BTDA. From the surface analysis, it was confirmed that the composite inhibitors could successfully adsorb onto the copper surface <em>via</em> the polar atoms of the benzene, azole, and thiazole rings. The adsorption formed multilayer inhibitor films comprised of Cu–NBTAH and Cu–BTDA chelates. In addition, these films significantly reduced the wettability of the O/W emulsions on the copper surface, thus isolating copper from the corrosive medium. The anti-corrosion mechanism for adsorption and shielding of the composite inhibitors on the copper surface is preliminarily proposed.</p>","PeriodicalId":102,"journal":{"name":"RSC Advances","volume":null,"pages":null},"PeriodicalIF":3.9000,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11460213/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"RSC Advances","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2024/ra/d4ra04757e","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Copper sheets corrode easily when exposed to oil-in-water (O/W) emulsions during metal-forming processes. The quest for identifying novel, high-efficiency copper inhibitors and realizing the effective protection of copper surfaces from emulsion corrosion has gradually attracted considerable attention. In this study, two organic heterocyclic derivatives, N,N-bis(2-ethylhexyl)-4-methyl-1H-benzotriazol-1-methanamine (NBTAH) and 2,5-bis(octyldithio)-1,3,4-thiadiazole (BTDA), were introduced as copper inhibitors into O/W emulsions. Their corrosion inhibition performance was investigated in-depth using electrochemical measurements, surface characterization, adsorption isotherms and wetting techniques. The results indicated that both inhibitors generated anodic passive films on the copper surface, and thus enhanced the corrosion resistance. The maximum corrosion inhibition efficiency achieved was 94.0% with combination of 5 mM NBTAH and 8 mM BTDA. From the surface analysis, it was confirmed that the composite inhibitors could successfully adsorb onto the copper surface via the polar atoms of the benzene, azole, and thiazole rings. The adsorption formed multilayer inhibitor films comprised of Cu–NBTAH and Cu–BTDA chelates. In addition, these films significantly reduced the wettability of the O/W emulsions on the copper surface, thus isolating copper from the corrosive medium. The anti-corrosion mechanism for adsorption and shielding of the composite inhibitors on the copper surface is preliminarily proposed.
期刊介绍:
An international, peer-reviewed journal covering all of the chemical sciences, including multidisciplinary and emerging areas. RSC Advances is a gold open access journal allowing researchers free access to research articles, and offering an affordable open access publishing option for authors around the world.