Polypyrrole layers for steel protection

This report describes the behaviour of polypyrrole and polypyrrole/carboxim ethylcellulose (Ppy/CMC) prepared by different methods in order to prevent the corrosion of steel. Potentiodynamic polarization curves and open circui t potential were used to evaluate the capacity of these materials to protec t the surface. The results obtained allowed to assume that Ppy/CMC is bette r material to prevent corrosion than polypyrrole (Ppy) and potentiostatic m ethod better than galvanostatic to obtain the deposit. (C) 2001 Elsevier Sc ience B.V. All rights reserved.