A STUDY OF THE CORROSION INHIBITION OF CARBON-STEEL IN DILLUTED AMMONIA MEDIA USING 2-MERCAPTO-BENZOTHIAZOL (MBT)
Adriana Samide,a,* Ion Bibicu,b Mircea Rogalski,c and Mircea Predad
a Faculty of Chemistry,
c Physics Department, Instituto
Superior Tecnico, Av. Rovisco
d Faculty of Chemistry,
The inhibiting effect of MBT has been studied regarding the corrosion of carbon-steel in diluted ammonia solution at room temperature. The effects of the inhibitor have been demonstrated using weight loss and electrochemical measurements. The increase of the inhibitor concentration leads to a decrease in the corrosion rate and in the corrosion current. The microscopic analysis of the surface of the electrode shows a decrease of the corrosion spots with the increase of the MBT concentration. This indicates a good adsorbability of MBT on the metal surface. Mössbauer spectrometry shows the formation of a superficial film on the surface of the corroded sample in the presence of MBT. This film provides a good corrosion protection for the sample.
Key words: carbon-steel, ammonia media, inhibitor, MBT, Mössbauer spectrometry