Abstract
To meet the corrosion challenge of pipeline steel under complex mixed cases, the corrosion behavior of X65 steel joints welded by employing three low-temperature phase transformation welding wires was investigated. The low temperature phase transformation electrodes welded joints were exposed to saturated CO2 aqueous solution containing H2S of different pH values for electrochemical corrosion test. The Potentiodynamic polarization curve, Electrochemical Impedance Spectroscopy (EIS) and corrosion morphology were analyzed. The results showed that the Cr and Ni element within joints can enhance the corrosion resistance. The corrosion resistance of the welded joint is improved as the pH of etching liquid increases. The corrosion mechanism was further revealed.
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