Electrochemical Corrosion Behavior and Microstructural Characterization of HVOF Sprayed Inconel-718 Coating on Gray Cast
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TECHNICAL ARTICLE—PEER-REVIEWED
Electrochemical Corrosion Behavior and Microstructural Characterization of HVOF Sprayed Inconel-718 Coating on Gray Cast Iron Hitesh Vasudev Amit Bansal
. Gaurav Prashar . Lalit Thakur .
Submitted: 14 September 2020 / in revised form: 11 October 2020 / Accepted: 12 October 2020 ASM International 2020
Abstract In the present work, Inconel-718 (IN718) coating was developed on a gray cast iron (C.I) substrate by utilizing a high-velocity oxy-fuel spray technique. The microstructural analysis was performed to know the topological characteristics of the deposited IN718 coating. Corrosion testing of bare and coated samples was carried out at an ambient temperature in a NaCl solution (3.5 wt.%) using potentiodynamic polarization technique. The kinetics of corrosion and surface characteristics of the assprayed and corroded coatings were studied by scanning electron microscopy/energy-dispersive spectroscopy
techniques. The different phases in the feedstock powder and as-sprayed coating were determined through X-ray diffraction analysis. The reported average microhardness value of the developed IN718 coating was 563 ± 15 HV0.2. The increased hardness of the IN718 coating is credited to the existence of Mo and Ti elements in the IN718 coatings. Corrosion testing showed that the IN718 coating exhibited the maximum corrosion resistance compared to a C.I. substrate due to a stable passive layer in the IN718 specimen.
H. Vasudev (&) G. Prashar School of Mechanical Engineering, Lovely Professional University, Phagwara 144411, India e-mail: [email protected]; [email protected] G. Prashar e-mail: [email protected] L. Thakur Mechanical Engineering Department, NIT Kurukshetra, Kurukshetra 136119, India e-mail: [email protected] A. Bansal Mechanical Engineering Department, IKGPTU, Jalandhar 144603, India e-mail: [email protected]
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J Fail. Anal. and Preven.
Graphic Abstract
Keywords Gray cast iron Inconel-718 HVOF Electrochemical Corrosion
Introduction Corrosion may deteriorate the surface and subsurface of the typical engineering components in aggressive mediums. The enhancement in the engineering components’ surface properties by utilizing surface engineering techniques can significantly improve the life of a component used in the aggressive environment condition. Cast iron is commercially used in industrial applications like agriculture, oil, gas-based industries, marine ships, machine tools, roller mills, and petroleum industries [1, 2]. The significant research and development (R&D) activities have been conducted to find out the ways to enhance the mechanical and wear-resistant properties of the C.I. components during the actual practical conditions. A material that has a combination of improved mechanical, physical, and chemical properties is considered as the most efficient for material selection in strenuous conditions. Most industrial applications commonly deal with surface modification of the structural parts; therefore, applying a layer of
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