2-Butyne-1,4-diol as a novel corrosion inhibitor for API X65 steel pipeline in carbonate/bicarbonate solution

The inhibition effects of 2-butyne-1,4-diol on the corrosion susceptibility of grade API 5L X65 steel pipeline in 2 M Na2CO3/1 M NaHCO3 solution were studied by electrochemical techniques and weight loss measurements. The results indicated that this inhibitor was a mixed-type inhibitor, with a maximum percentage inhibition efficiency of approximately 92% in the presence of 5 mM inhibitor. Atomic force microscopy revealed that a protective film was formed on the surface of the inhibited sample. The adsorption of the inhibitor was found to conform to the Langmuir isotherm with the standard adsorption free energy of −21.08 kJ mol−1.

► Corrosion of API 5L X65 is effectively reduced by the addition of the inhibitor.
► The techniques include weight loss, potentiodynamic polarization, EIS and AFM.
► 2-Butyne-1,4-diol acts as a mixed-type inhibitor.
► The adsorption of 2-butyne-1,4-diol obeys Langmuir adsorption isotherm.