✦ LIBER ✦

Corrosion of mild steel in acid solutions containing thiourea and thiosemicarbazide

✍ Scribed by Dr. W. Khalil; M. S. A. Abdou; I. A. Ammar

Publisher: John Wiley and Sons
Year: 1990
Tongue: English
Weight: 463 KB
Volume: 21
Category: Article
ISSN: 0933-5137
DOI: 10.1002/mawe.19900210608

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Cathodic polarization curves for mild steel in 1.0 N H~2~SO~4~ and 1.0N HCl, containing various concentrations of thiourea (TU) (1–25 mM) and thiosemicarbazide (TSC) (0.2–25 mM), were measured in the temperature range 20–50 °C. The apparent activation energy for corrosion (ΔE*) was calculated from I~cor~ vs 1/T and R~p~/T vs 1/T relations. ΔE* is virtually constant by changing TU concentrations (55–57 KJ/mole in H~2~SO~4~). An interpretation for the loss of inhibition efficiency of TU in acid solution is given. This is based on the decomposition of TU to ammonium thiocyanate.

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