Macrocyclic compounds as corrosion inhibitors

Journal Article · Tue Dec 01 04:00:00 EST 1998 · Corrosion

DOI:https://doi.org/10.5006/1.3284822· OSTI ID:305354

Quraishi, M A; Rawat, J; Ajmal, M ^[1]

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1. Aligarh Muslim Univ., Uttar Pradesh (India)

The influence of three macrocyclic compounds on corrosion of mild steel (MS) in hydrochloric acid (HCl) was investigated using weight loss, potentiodynamic polarization, alternating current (AC) impedance, and hydrogen permeation techniques. All the investigated compounds showed significant efficiencies and reduced permeation of hydrogen through MS in HCl. Inhibition efficiency (IE) varied with the nature and concentrations of the inhibitors, temperature, and concentrations of the acid solutions. The addition of iodide ions (I{sup {minus}}) increased IE of all the tested compounds as a result of the synergistic effect. Potentiodynamic polarization results revealed that macrocyclic compounds acted as mixed inhibitors in 1 M HCl to 5 M HCl. Adsorption on the metal surface obeyed Temkin`s adsorption isotherm. Auger electron spectroscopy (AES) of the polished MS surface, exposed with tetraphenyldithia-octaazacyclotetradeca-hexaene (PTAT) proved adsorption of this compound on the surface through nitrogen and sulfur atoms.

• Sponsoring Organization: USDOE
• OSTI ID: 305354
• Journal Information: Corrosion, Journal Name: Corrosion Journal Issue: 12 Vol. 54; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUGER ELECTRON SPECTROSCOPY
CORROSION INHIBITORS
CORROSION PROTECTION
HYDROCHLORIC ACID
HYDROGEN
POTENTIOMETRY
STEELS