Corrosion of G105 steel in inhibited oilfield heavy brine

The corrosion behaviour of G105 steel in an inhibited oilfield heavy brine was studied using potentiodynamic polarisation and electrochemical impedance spectroscopy in order to evaluate corrosion inhibition using a quaternary alkynoxymethyl amine. The results showed that the quaternary alkynoxymethyl amine appeared to be a mixed type inhibitor with inhibition efficiency greater than 90% at 60°C. X-ray diffraction studies on the corrosion products revealed the presence of β-FeOOH in brine at 60°C.