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

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...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2019-04, Vol.509 (1)
Main Authors: Osoh, Abiola-Edobor, Ita, Benedict Iserom, Ajanaku, Kolawole Oluseyi, de la Presa, P., Ehi-Eromosele, Cyril O., Cobos Fernández, Miguel Angel, Durodola, Bamidele
Format: Article
Language:English
Subjects:
Corrosion
Corrosion prevention
Corrosion rate
Corrosion tests
Ferromagnetic phases
Ferromagnetism
Gold
Grain growth
Gravimetry
Insulators
Low carbon steels
Magnetic measurement
Magnetic properties
Metal-insulator transition
Morphology
Nanoparticles
Phase transitions
Sol-gel processes
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Summary: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.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/509/1/012039