Corrosion inhibitory properties of La0.5Ca0.5MnO3-gold nanoparticles in 1 M HCl

13th Joint Conference on Chemistry

Osoh, Abiola-Edobor^1^3 ; Ita, Benedict Iserom^2 ; Ajanaku, Kolawole Oluseyi^1 ; De La Presa, P.^3 ; Ehi-Eromosele, Cyril O.^1 ; Fernández, Miguel Angel Cobos^3 ; Durodola, Bamidele^1

Department of Chemistry, Covenant University, Ota, Ogun State, Nigeria^1

Department of Pure and Applied Chemistry, University of Calabar, Cross River State, Nigeria^2

Applied Magnetism Institute, UCM-ADIF-CSIC, Las Rozas

28230, Spain^3

关键词: Average particle size;    Bragg's reflections;    Gravimetric methods;    Langmuir isotherm;    Morphological properties;    Paramagnetic-ferromagnetic phase transitions;    Shaped nanoparticles;    Sintering temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/509/1/012039/pdf
DOI  :  10.1088/1757-899X/509/1/012039

来源: IOP

【 摘 要 】

The morphological, magnetic, transport and corrosion inhibitory property of La0.5Ca0.5MnO3-AuNPs prepared by sol gel method was determined. The structural property determined by XRD indicated that the unusual broadening of the Bragg's reflection despite the elevated sintering temperature was as a result of the inhibition of the grain growth by the gold nanoparticles (Au-NPs). The morphological property of the sample as determined by SEM and TEM show heterogeneously sized and shaped nanoparticles of an average particle size of 40 nm. The magnetic measurements of La0.5Ca0.5MnO3-AuNPs showed that the sample undergoes a paramagnetic - ferromagnetic phase transition with Tc = 250K and Tb = 150K. Two metal-insulator transitions were observed at T1 and T2. The resistivity of the sample was observed to reduce as temperature increased to 300 K. The gravimetric method was used to determine the corrosion inhibitory properties with 1.0 M HCl using different concentration of La05Ca0.5MnO3-AuNPs. The anti-corrosion study was carried out for 21 days and was observed to reduce as concentration of La0.5Ca0.5MnO3-AuNPs increased, but corrosion rate increased as the exposure time increased. The inhibitory property of the sample increased as the concentration of the sample increased. The reaction best fitted the Langmuir isotherm, indicating a monolayer of La0.5Ca0.5MnO3-AuNPs inhibiting the corrosion of the mild steel.