Abstract
SUMMARYVoltammetry and EIS were used to study the adsorption behaviour of laprol 2402 C (the copolymer of ethene and propene oxides) on a Sn electrode in strongly acid Sn(II) sulphate solutions. At least two states of adsorption layers were found to exist depending on cathodic polarisation. Adsorption of laprol, observed at low or sufficiently high cathodic polarisations, results in a moderate decrease in the double layer capacitance (from 100 to 18 μF cm2) and is accompanied by 100-fold reduction in the exchange current density. A pronounced inhibition of Sn(II) reduction takes place in the vicinity of-0.3 V where voltammograms acquire a negative slope. High negative charge transfer resistance ranging from -2.3 to -4.5 kΩ cm2 and low (7–9 μF cm 2) double layer capacitances are indicative of the formation of a more compact surface layer.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call