摘要
The novel use of p-nitrophenyldiazonium tetrafluoroborate salt(GG salt)as a protectant that is electrochemically grafted onto carbon steel has been investigated in0.05 mol L-1H2SO4and 5 wt%NaCl solutions using various corrosion monitoring techniques,such as electrochemical impedance spectroscopy,potentiodynamic polarisation,infrared spectra and scanning electron microscopy measurements.The electrochemical study reveals that this compound is a mixed inhibitor that predominantly controls the cathodic reaction.The surface-grafted film decreases the double-layer capacitance and obviously increases the charge transfer resistance relative to a bare carbon electrode.The values of inhibition effect remain nearly unchanged with an increase in temperature range of 298–318 K.The aryl diazonium is covalently bonded on the steel surface,causing a slight decrease in the apparent activation energy.Overall,the surface-grafted films exhibit excellent inhibition performance in acid and saline solutions within the studied temperature range.
The novel use of p-nitrophenyldiazonium tetra-fluoroborate salt （GG salt） as a protectant that is electro-chemically grafted onto carbon steel has been investigated in0.05 mol L-1 H2SO4 and 5 wt% NaC1 solutions using variouscorrosion monitoring techniques, such as electrochemicalimpedance spectroscopy, potentiodynamic polarisation,infrared spectra and scanning electron microscopy measure-ments. The electrochemical study reveals that this compoundis a mixed inhibitor that predominantly controls the cathodicreaction. The surface-grafted film decreases the double-layercapacitance and obviously increases the charge transferresistance relative to a bare carbon electrode. The values ofinhibition effect remain nearly unchanged with an increase intemperature range of 298-318 K. The aryl diazonium iscovalently bonded on the steel surface, causing a slightdecrease in the apparent activation energy. Overall, the sur-face-grafted films exhibit excellent inhibition performance inacid and saline solutions within the studied temperaturerange
基金
supported by the National Natural Science Foundation of China(21103105)
the Foundation for University Youth Teachers by the Shanghai Education Committee
the Innovation Fund of Shanghai University(50334040)
