Data/hora: 25/05/2024 13:12:54

Biblioteca(s): | Embrapa Instrumentação.
Data corrente: | 04/04/2022
Data da última atualização: | 23/01/2024
Autoria: | MITRE, C. I. N.; PARIS, E. C.; LOBO, C. M. S.; ROTH, C.; COLNAGO, L. A.
Afiliação: | ELAINE CRISTINA PARIS, CNPDIA; LUIZ ALBERTO COLNAGO, CNPDIA.
Título: | Use of time domain nuclear magnetic resonance relaxometry to monitor the rffect of magnetic field on the copper corrosion rate in real time.
Ano de publicação: | 2022
Fonte/Imprenta: | Magneto Chemistry, v. 8, 40, 2022.
Páginas: | 11 p.
ISSN: | 2312-7481
DOI: | 10.3390/magnetochemistry800040
Idioma: | Inglês
Conteúdo: | The corrosion of metals is a major problem of modern societies, demanding new technologies and studies to understand and minimize it. Here we evaluated the effect of a magnetic field (B) on the corrosion of copper in aqueous HCl solution under open circuit potential. The corrosion product, Cu2+, is a paramagnetic ion and its concentration in the solution was determined in real time in the corrosion cell by time-domain NMR relaxometry. The results show that the magnetic field (B = 0.23 T) of the time-domain NMR instrument reduces the corrosion rate by almost 50%, in comparison to when the corrosion reaction is performed in the absence of B. Atomic force microscopy and X-ray diffraction results of the analysis of the corroded surfaces reveal a detect-able CuCl phase and an altered morphology when B is present. The protective effect of B was explained by magnetic forces that maintain the Cu2+ in the solution/metal interface for a longer time, hindering the arrival of the new corrosive agents, and leading to the formation of a CuCl phase, which may contribute to the rougher surface. The time-domain NMR method proved to be useful to study the effect of B in the corrosion of other metals or other corrosive liquid media when the reactions produce or consume paramagnetic ions.
Palavras-Chave: | Copper corrosion; Magnetocorrosion; Time-domain NMR relaxometry.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1141768/1/P-Use-of-time-domain-nuclear-magnetic-resonance-relaxometry-....pdf
Registro original: | Embrapa Instrumentação (CNPDIA)
Exemplares: | CNPDIA - (17977-1) - UPC - AP - DD - PROCI.22/38 -  - 2022/40 - DIS