The application of the Electrochemical Quartz Crystal Microbalance (EQCM) to the study of the metal corrosion and its inhibition is quite recent. The sensibility of the technique and the possibility of the simultaneous registration of the mass variations of the electrode and the current density during the voltammogram recording could be valuable for the investigations of the corrosion of metals in conditions of very low corrosion rate. In this paper the preliminary results of tests of corrosion inhibition of Ni in 0.1 M HClO4 by means of EQCM are reported. Corrosion rates of electrodeposited Ni in 0.1 M HClO4 in the absence and in the presence of different inhibitors in free corrosion conditions were determined. The following inhibitors were used: Potassium Iodide (KI), Tributyl benzyl ammonium iodide (TBNI), Dodecyl quinolinium Bromide (DDQBr), Benzyl quinolinium chloride (Bqc) and Acridin (Acr). The influence of the addition of the inhibitors on the corrosion rate of Ni was also measured. The corrosion rate of Ni was drastically reduced by KI and TBNI. DDQBr showed a good inhibitive efficiency, the Bqc only a small effect, whereas Acr stimulated the Ni corrosion. Voltammograms at different scan rate in the same solutions were recorded and the mass variation registered. By comparison of the current density and the mass variation, a qualitative interpretation of the passivation of Ni and the mechanism of the action of the different inhibitors was suggested.
Study of the corrosion inhibition of Ni in 0.1M HClO4 by means of EQCM
ZUCCHI, Fabrizio;TRABANELLI, Giordano
1997
Abstract
The application of the Electrochemical Quartz Crystal Microbalance (EQCM) to the study of the metal corrosion and its inhibition is quite recent. The sensibility of the technique and the possibility of the simultaneous registration of the mass variations of the electrode and the current density during the voltammogram recording could be valuable for the investigations of the corrosion of metals in conditions of very low corrosion rate. In this paper the preliminary results of tests of corrosion inhibition of Ni in 0.1 M HClO4 by means of EQCM are reported. Corrosion rates of electrodeposited Ni in 0.1 M HClO4 in the absence and in the presence of different inhibitors in free corrosion conditions were determined. The following inhibitors were used: Potassium Iodide (KI), Tributyl benzyl ammonium iodide (TBNI), Dodecyl quinolinium Bromide (DDQBr), Benzyl quinolinium chloride (Bqc) and Acridin (Acr). The influence of the addition of the inhibitors on the corrosion rate of Ni was also measured. The corrosion rate of Ni was drastically reduced by KI and TBNI. DDQBr showed a good inhibitive efficiency, the Bqc only a small effect, whereas Acr stimulated the Ni corrosion. Voltammograms at different scan rate in the same solutions were recorded and the mass variation registered. By comparison of the current density and the mass variation, a qualitative interpretation of the passivation of Ni and the mechanism of the action of the different inhibitors was suggested.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
