Use of HPHT Autoclave to Determine Corrosion Inhibition by Berberine extract on Carbon Steels in 3.5% NaCl Solution Saturated with CO2

Roots extract of Coptis chinensis (Berberine extract) was characterized using gas chromatography (GC) and Fourier transform infrared spectroscopy (FTIR) methods. The influence of berberine extract on corrosion of carbon steels (J55, N80, P110SS and C110 steels) in 3.5 wt.% NaCl solution saturated with CO2 was evaluated using static high pressure and high temperature (HPHT) autoclave. The surface was further evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and contact angle measurements. Quantum chemical calculations have been used to evaluate the structural, electronic, and reactivity parameters of the inhibitor on the steels surface. SEM, XRD, and contact angle measurement studies reveal that the surface of metals are quite unaffected after use of inhibitor in 3.5% NaCl solution saturated with CO2.