Abstract
In this study, the corrosion behavior of different regions of the weld metal produced from the E8018-G electrode containing 7.0 wt% Ni in a corrosive solution has been investigated. X-ray diffraction (XRD) method has been used to compare the phase intensity in different welding regions. Electrochemical evaluations show that in the weld joint, by moving from the root of the weld metal to the upper layers of the center and cap, the corrosion resistance of the weld metal increases. In addition, the results demonstrates that the corrosion of the St-52 welded joint mainly occurs in the heat affected zone (HAZ). According to the microstructures observed from the spectra obtained by the field emission scanning electron microscopy (FE-SEM), the corrosion behavior of the weld metal has been evaluated. The examination of the local weld metal layers indicates that not only the corrosion resistance of the cap layer has improved compared to the central and root layers, but also the corrosion resistance has increased compared to the base metal. This improvement is attributed to the existence of a homogeneous acicular ferrite microstructure in the cap layer and higher nickel content.
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