Abstract:
The paper presents the results obtained when using one ketonic Mannich base BM (1-(2’-hydroxyphenyl)-3-(1-
piperidinylamino)propan-1-one hydrochloride) as corrosion inhibitor in saline environment, for different types of carbon steels,
with various alloying elements. The Mannich base was synthesized and used in corrosion experiments, in concentrations varying
from 0….1300 ppm. The corrosion experiments were performed by potentiodynamic polarization studies, with 50 mVs-1 scan
rate. The corrosion rate and inhibition efficiency were calculated from corrosion current density, determined from polarization
curves. Based on the experimental data, the interactions between the steel and the organic inhibitor were discussed. It was proved
that adsorption process occurs in all cases and the mechanism strongly depends on the alloying elements. It could be estimated
that the inhibitor’s adsorption is due to the interaction with the aromatic ring and with the ionic head.