1. bookVolume 20 (2020): Issue 1 (June 2020)
Journal Details
License
Format
Journal
eISSN
1339-4533
First Published
16 Apr 2016
Publication timeframe
2 times per year
Languages
English
access type Open Access

Evaluation of the Corrosion Resistance of WC-Co Coating on AZ91 Applied by Electro Spark Deposition

Published Online: 31 Jul 2021
Volume & Issue: Volume 20 (2020) - Issue 1 (June 2020)
Page range: 30 - 40
Journal Details
License
Format
Journal
eISSN
1339-4533
First Published
16 Apr 2016
Publication timeframe
2 times per year
Languages
English
Abstract

In order to enhance the surface properties of a magnesium-based substrate, WC-Co coating was applied on AZ91 alloy by electro spark deposition (ESD), successfully for the first time. The optimum parameters of the ESD process were achieved, based on the corrosion behavior and calculated corrosion rate of the coated samples when 5kHz and 25 A were chosen. For evaluation of the corrosion performance of the achieved WC-Co layers, polarization, and electrochemical impedance spectroscopy tests were carried out in the 3.5 wt % Na3PO4 solution at room temperature. Polarization results show that the corrosion rate (mpy) is in the optimum condition almost half of a bulk sample of uncoated AZ91. Field emission scanning electron microscopy (FE-SEM) was used to examine the surface morphology of applied coatings. These results show that at a lower current, the amount of deposited WC-Co was reduced. The maximum surface microhardness obtained was 193 HV0.2.

Keywords

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