ELECTROCHEMICAL CORROSION BEHAVIOR AND MICROSTRUCTURAL CHARACTERIZATION OF HVOF SPRAYED INCONEL718-Al2O3 COMPOSITE COATINGS

Hitesh Vasudev (), Gaurav Prashar (), Lalit Thakur () and Amit Bansal
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Hitesh Vasudev: School of Mechanical Engineering, Lovely Professional University, Phagwara, Punjab 144411, India
Gaurav Prashar: School of Mechanical Engineering, Lovely Professional University, Phagwara, Punjab 144411, India
Lalit Thakur: ��Mechanical Engineering Department, NIT Kurukshetra, Kurukshetra, Haryana 136119, India
Amit Bansal: ��IKGPTU, Jalandhar, Punjab 144603, India

Surface Review and Letters (SRL), 2022, vol. 29, issue 02, 1-14

Abstract: In the current experimental study, grey cast iron (CI) substrate was coated with Inconel718-Al2O3 based composite coating with a high-velocity oxy-fuel technique. The effect of changing the Al2O3 content (10, 20 and 30 wt.%) on the microstructure, hardness, porosity and electrochemical corrosion performance of Inconel (INC718) coating was studied. Investigations on the corrosion behavior of uncoated and HVOF-coated substrates were carried out at room temperature at 3.5wt.% sodium chloride solution (NaCl) with the help of the potentiodynamic polarization approach. The surface morphologies and compositions of HVOF as-sprayed and electrochemically corroded coatings were studied through SEM and EDS techniques. The various phases existing in the INC718 and Al2O3 feedstock powders and HVOF-deposited composite coatings were determined by XRD analysis. The microhardness of INC718-based coatings was found to be increased with the increase in Al2O3 content. The highest average microhardness value of about 801±40HV0.2 was observed in INC718-30wt.% Al2O3 coating. The deposited coatings exhibited an increased porosity level with the increased amount of Al2O3 contents. However, the coating with 10wt.% Al2O3 content exhibited the maximum corrosion resistance. Its improved corrosion performance is attributed to low porosity levels, which causes the penetrating pathways of Cl− ions to be blocked completely.

Keywords: INC718; HVOF; Al2O3; composite coatings; electrochemical corrosion (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0218625X22500172

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