Abstract
Due to excellent mechanical properties and corrosion resistance, the carbon steel/nickel-based alloy has huge potential for using in oil and gas industry. The pipes are usually joined by welding. Hence, it is significant to study the effect of welding on the corrosion properties. A literature search indicates that few studies have been conducted on the corrosion properties. Accordingly, in the present work, electrochemical measurements together with immersion tests were used to analyze the corrosion properties of Inconel 625 clad layers and butt-weld metal. The hardness was also determined. The microstructures, morphological features, and the changes observed in the surface composition were evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), together with energy-dispersive spectroscopy (EDS). The microstructures of Inconel 625 clad layers and butt-weld metal consist of primary γ-Ni solid solution dendritic, γ/laves interdendritic eutectic. Because of the heat effect induced by multi-pass welding, element segregation and more participation of carbide were observed in the butt-weld metal, which could account for higher hardness and inferior corrosion resistance of the butt-weld metal as compared to the clad layer.
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