A novel experimental arrangement for corrosion study of X60 pipeline steel weldments at turbulent flow conditions

Abstract

Electrochemical noise (EN) measurements were carried out to study the effect of turbulent flow conditions on corrosion kinetic of API X60 pipeline steel weld immersed in synthetic seawater. In order to control the hydrodynamic conditions, two rotating cylinder electrodes were used. The EN data were analysed by three different statistical methods: currents transients, noise resistance and localisation index (LI). On the other hand, the spectral method was used in order to get the noise impedance. The superficial analysis using a scanning electron microscopy was carried out. According to EN analyses, the current transients indicate that the aggressiveness of the corrosion increased as the rotation speed also increased. The highest corrosion rate values were obtained at turbulent flow conditions. In the superficial analysis, a localised corrosion form was found in all corrosion processes; these results are agreed with the results obtained by LI.

Keywords:

• Electrochemical noise
• Rotating cylinder electrode
• X60 pipeline steel
• Weld
• Turbulent flow

Acknowledgements

The author D. Cabrera-de la Cruz would like to thank to CONACyT for the support required developing this work.

ORCID

R. Galván-Martínez http://orcid.org/0000-0003-2889-1135