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This paper presents a comprehensive method to evaluate the mixture of  dicyclohexilamine and oleylamine (DCHA+OA) as corrosion inhibitor for mild  steel in CO2 environment in liquid and vapor phase. Corrosion inhibitor  volatile properties were investigated in order to determine if DCHA+OA can be  used to control the severity of the top of the line (TLC) corrosion attack.  Corrosion measurements were performed using electrochemical impedance  spectroscopy, linear polarization resistance, potentiodynamic sweep  measurements, as well as the electrical resistance measurements and weight  loss measurements, in order to determine the inhibitive performances of  dicyclohexilamine and oleylamine. In order to define surface morphological  characteristics scanning electron microscopy technique was applied. The  electrochemical study and weight loss measurements indicated that DCHA+OA  significantly decreased the corrosion rate in liquid phase when 50 ppm of  DCHA+OA was added. Scanning electron microphotographs indicated protective  inhibitor film has formed on the steel surface and revealed that good  protection was achieved, along with the decrease in the corrosion rate  determined by weight loss and electrochemical techniques. Using electrical  resistance measurements in vapor phase it was shown that concentration of  1000 ppm DCHA+OA significantly decreased the corrosion rate at the top of the  line, only when it was carried there within its own foam and not due its  volatility

journal of the serbian chemical society

The mixture of dicyclohexilamine and oleylamine as corrosion inhibitor for mild steel in NaCl solution saturated with CO2 under both continual immersion and top of the line corrosion