Abstract
Ni-Cr weld overlay alloys with dispersed carbide particles were prepared by a plasma transferred arc welding process. The corrosion behavior of the 40 vol% carbide/Ni-Cr materials was studied in sodium chloride solution by electrochemical techniques, scanning electron microscopy, x-ray diffraction, and electron dispersive spectroscopy. The materials under investigation were powder blends of Ni-50 mass % Cr powder mixed with NbC, TaC, TiC, WC, O3C2, or VC. The NbC, TaC, TiC, and WC particles partially dissolved in the molten alloy, causing the crystallization of M23C6. Blends with Cr3C2 and VC particles produced the crystallization of M7C3, VxCryCz and M23C6. The VC/Ni-Cr alloy combination caused preferential localized corrosion and the carbide remained as VxCryCz. The Cr3C2/Ni-Cr alloy combination became studded with the Cr-Cl corrosion product compound. With the WC/Ni-Cr alloy combination, the WC particles became oxidized and corrosion product spread over the matrix. Other carbides were not oxidized, but the matrix of the alloys with these dispersed particles did become covered with Cr-rich corrosion products. The NbC/Ni-Cr material exhibited the best corrosion resistance.
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