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abstract
The effect of novel, pyrazolone derivatives, namely, (Z)-3-methyl-4-(2-m-tolylhydrazono)-1H-pyrazol-5(4H)—compound A, (Z)-4-(2-(3-methoxyphenyl)hydrazono)-3-methyl-1H-pyrazol-5(4H)—compound B, and (Z)-3-methyl-4-(2-(3-nitrophenyl) hydrazono)-1H-pyrazol-5(4H)—compound C as corrosion inhibitors of 316L stainless steel (SS) in 1 M HCl has been investigated by using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and electrical frequency modulation (EFM) techniques. Polarization data clearly indicated that the pyrazol-5-one derivatives behave as mixed type inhibitors. The effect of temperature on corrosion inhibition has been studied and the thermodynamic activation and adsorption parameters were calculated and discussed. EIS was used to investigate the mechanism of corrosion inhibition. EFM can be used as a rapid and nondestructive technique for corrosion rate measurements without prior knowledge of Tafel constants. The adsorption of compounds on 316L SS was found to obey Temkin adsorption isotherm.