Study of the corrosion inhibition of carbon-steel in dilute ammoniacal media using N-ciclohexil-benzothiazole-sulphenamida

The inhibiting effect of N-ciclohexil-benzothiazole-sulphenamida (NCBSA) on the corrosion of carbon-steel in diluted ammonia solution at room temperature has been studied by Mossbauer spectroscopy, electrochemical measurements, weight loss and surface microscopic analysis. A decrease in the corrosion spot concentration with the increase of the NCBSA concentration indicates a good adsorbability of NCBSA on the metal surface. Mossbauer spectrometry shows the formation of a layer at the surface of the corroded sample, which is interpreted in terms of the formation of complexes between NCBSA and the metal cations present in the carbon-steel structure.