Corrosion Behavior of X65 Pipeline Steel in Simulated Seawater Environment

Weight loss method, SEM and scanning Kelvin probe (SKP) technology were used to investigate the corrosion behavior of X65 pipeline steel in simulated seawater environment. Electrochemical methods were used to study the effect of temperature and SO₄^2- content on corrosion behavior of X65 pipeline steel in simulated seawater environment. The results showed that the corrosion rate of X65 steel increased with the increase of SO₄^2-, and the self-corrosion current density of X65 steel increased with the increase of temperature. The average corrosion rate of X65 steel decreased with the extension of immersion time, but the localized corrosion was further aggravated and obvious pitting phenomenon occurred.