Corrosion resistant nickel-based alloys are extensively used in industries where other metallic system experiences high uniform and localized corrosion attack. The corrosion behavior of mill-annealed nickel-based alloys are widely studied in aggressive environments but there is not much information available for the corrosion performance of their welded region even though welds are relatively susceptible to corrosion attack compared to the base material.

In the present study, corrosion behavior of base metal (BM), all-weld-metal (AWM) and heat-affected-zone (HAZ) samples of C-276 (UNS N10276), C-22 (UNS N06022) and C-2000 (UNS N06200) alloys were evaluated in concentrated hydrochloric (HCl), sulfuric (H2SO4) and nitric acid (HNO3). Also, the critical pitting temperature (CPT) of AWM specimens was obtained and compared with the BM. The results were analyzed using weight change measurements, electrochemical techniques and a range of surface analytical tools.

Subject
Acids, Materials, Corrosion resistant alloys, Corrosion rate, Materials performance, Microstructure, Molybdenum alloys, Base metals, Reagents, Corrosion resistance, Localized corrosion, Alloys, Wrought metals
Keywords:
Ni-Cr-Mo (W) Alloys, All-Weld-Metal, Heat-Affected-Zone, Acids, Critical Pitting Temperature, Critical Crevice Temperature, Potentiodynamic Technique, SEM, XRD
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2017
Association for Materials Protection and Performance (AMPP)
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