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51318-11155-Corrosion Behavior of Powder Metallurgical Cobalt-Based Alloys in Hydrochloric Acid

Picture for Corrosion Behavior of Powder Metallurgical Cobalt-Based Alloys in Hydrochloric Acid
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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.

Product Number: 51318-11155-SG
Author: Jinhui Ding / Yuexiang Zhang
Publication Date: 2018
Industry: Science of Corrosion
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Cobalt-based alloys, though possessing relevant resistance to oxidation and erosion, inevitably encounter corrosion in acidic environments. In this paper, the cobalt-based alloys containing Cr-Ni-Mo-W-Co ingredients were produced by hot isostatic pressing (HIP) method and their corrosion behavior in hydrochloric acid was investigated using potentiodynamic polarization (PDP) curves, electrochemical impedance spectroscopy (EIS) measurements and immersion corrosion tests. Post-test, the alloys surface was characterized by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), the ions concentration in corrosion solution was characterized by inductively coupled plasma (ICP). The results indicated that corrosion resistance of three alloys follows the order 3.0Mo > 1.0Mo > 0.5Mo. During corrosion process, constituent Ni, Fe, Cr and Co in base material tend to dissolve preferentially, while carbides precipitates will be protected due to galvanic coupling in hydrochloric acid solution. Different alloy constituents and microstructures will result in different corrosion behaviors.

Key words: Cobalt-Based Alloys, Hydrochloric Acid, Hot Isostatic Pressing (HIP), corrosion behavior

Cobalt-based alloys, though possessing relevant resistance to oxidation and erosion, inevitably encounter corrosion in acidic environments. In this paper, the cobalt-based alloys containing Cr-Ni-Mo-W-Co ingredients were produced by hot isostatic pressing (HIP) method and their corrosion behavior in hydrochloric acid was investigated using potentiodynamic polarization (PDP) curves, electrochemical impedance spectroscopy (EIS) measurements and immersion corrosion tests. Post-test, the alloys surface was characterized by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), the ions concentration in corrosion solution was characterized by inductively coupled plasma (ICP). The results indicated that corrosion resistance of three alloys follows the order 3.0Mo > 1.0Mo > 0.5Mo. During corrosion process, constituent Ni, Fe, Cr and Co in base material tend to dissolve preferentially, while carbides precipitates will be protected due to galvanic coupling in hydrochloric acid solution. Different alloy constituents and microstructures will result in different corrosion behaviors.

Key words: Cobalt-Based Alloys, Hydrochloric Acid, Hot Isostatic Pressing (HIP), corrosion behavior

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