Technical note: Synergistic effect of iodide ions on inhibitive performance of substituted dithiobiurets during corrosion of mild steel in hot hydrochloric acid

Journal Article · Fri Oct 01 04:00:00 EDT 1999 · Corrosion (Houston)

DOI:https://doi.org/10.5006/1.3283927· OSTI ID:20013136

Quraishi, M A; Rawat, J; Ajmal, M

Four substituted dithiobiurets (i.e., 1,5-diphenyl-2,4-dithiobiuret [DPDTB]; 1-anisidyl-5-phenyl 2,4-dithiodiuret [APDTB]; 1-tolyl-5-phenyl 2,4-dithiobiuret [TPDTB]; and 1-chlorophenyl-5-phenyl 2,4-dithiobiuret [CPDTB]) were synthesized to study their inhibiting effect on mild steel (MS) corrosion in 5 N hot hydrochloric acid (HCl). The synergistic effect of these compounds with potassium iodide (KI) was studied at different concentrations, temperatures, and immersion periods by weight loss and potentiodynamic polarization methods. All compounds showed good inhibition efficiency (IE) at all temperatures and showed the enhancement in IE with the addition of small amounts of KI. Potentiodynamic polarization studies showed that APDTB and DPDTB are predominantly cathodic inhibitors, whereas TPDTB and CPDTB are mixed inhibitors. The adsorption of all these compounds followed Temkin's adsorption isotherm.

• Research Organization: Aligarh Muslim Univ. (IN)
• OSTI ID: 20013136
• Journal Information: Corrosion (Houston), Journal Name: Corrosion (Houston) Journal Issue: 10 Vol. 55; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CORROSION INHIBITORS
CORROSION PROTECTION
HYDROCHLORIC ACID
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
POTASSIUM IODIDES
POTENTIOMETRY
STEELS
WEIGHT