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High-entropy alloys (HEAs), are multicomponent alloys of at least 5 elements with 5-35 atomic % each. Immersion and electrochemical testing indicate that some high-entropy alloys have better corrosion performance than commercial alloys UNS N10276, UNS K03014, and UNS 31600.
High-entropy alloys (HEAs), are multicomponent alloys composed of at least five elements with compositions of 5-35 atomic % for each element. These alloys are being investigated for corrosion protection of natural gas transmission pipelines by studying their behavior under aqueous acidic conditions. Electrochemical and immersion experiments were carried out in 3.5 weight % NaCl solution at pH 4 and 40°C. Oxygen was purged out from the solution by using CO2 as stripping gas. The electrochemical experiments included potentiodynamic and electrochemical impedance spectroscopy tests, used to calculate corrosion rates. Potentiodynamic polarization curves, including cyclic voltammograms, were used to explain active, active-passive, and passive regions of these alloys and susceptibility to localized corrosion. Surface characterization of the corroded samples were performed using scanning electron microscopy (SEM) and x-ray diffraction (XRD). The results of the immersion and electrochemical testing indicate that some of the HEAs have better corrosion performance than commercial alloys UNS N10276, UNS K03014, and UNS 31600.
Keywords: high-entropy alloys (HEAs), immersion testing, potentiodynamic polarization, localized corrosion, electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), aqueous corrosion, natural gas transmission pipelines.
Austenitic stainless, S31254, and Hastelloy, N10276, were clad on low carbon steel plates with explosive welding for testing in a geothermal environment. Results from visual inspection and microstructural & chemical composition analysis with a scanning electron microscopy and X-ray energy dispersive spectroscopy
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The focus of this paper is the welding metallurgy and weld metal properties of N07022 alloy. Evaluation of the N07022 weld metal microstructure will be discussed. Sour gas testing of N07022 weld overlay material will be highlighted. Mechanical properties will be presented.
Cobalt-based alloys containing Cr-Ni-Mo-W-Co ingredients were produced and their corrosion behavior in hydrochloric acid was investigated using potentiodynamic polarization (PDP) curves, electrochemical impedance spectroscopy (EIS) measurements and immersion corrosion tests.