In this study a series of experiments was carried out in 0.6 M sulphamic acid solution at different temperatures in order to investigate the effect of chromium and molybdenum content on the corrosion behaviour of low alloy steels (ASTM A213 grade T12 (1.0Cr- 0.5Mo) and grade T22 (2.25Cr-1Mo) under stagnant conditions. The corrosion behaviour of both steels in 0.6M sulphamic acid solution in the absence and presence of Tryptophan(Trp) has been investigated using weight loss measurements, electrochemical impedance spectroscopy (EIS) and the new technique electrochemical frequency modulation (EFM). The results have revealed higher corrosion rates for the lower chromium and molybdenum content steel. Moreover, it was found that the inhibition efficiency increased with increasing inhibitor concentration, while a decrease was detected with the rise of temperature.
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Author Name: Hesham T.M. Abdel-Fatah, Medhat M. Kamel, Salah A. M. Rashwan, Saad M. Abd El Wahaab, Aliaa A. M. Hassan
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Keywords: Sulphamic acid, corrosion rate, EIS, EFM, amino acids
ISSN: 2278-6783
EISSN: 2278-6783
EOI/DOI: CS27204205
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