Morphology Evaluation of ZrO2 Dip Coating on Mild Steel and its Corrosion Performance in NaOH Solution

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Abstract

In this work, the morphology of ZrO2 thin film from dip coating process on mild steel has been investigated. Mild steel was dip-coated on solution made of zirconium butoxide as a precursor, ethanol as solvent, acetylacetone as chelating agent and water for hydrolysis. Number of dipping was adjusted at 3, 5 and 7 times. The dipped sample then annealed at 350°C for two hours by adjusting the heating rate at 1°C/min respectively. The optical microscope showed that micro-cracks were observed on the surface of the coating with its concentration reduced as dipping sequence increased. The XRD result showed that annealing process can produce polycrystalline tetragonal-ZrO2. Meanwhile, SEM image showed that the thicknesses of the ZrO2 coatings were in between 400-600 nm. The corrosion resistance of uncoated and coated substrates was studied by polarization test through potentio-dynamic polarization curve at 1mV/s immersed in with 3.5% NaCl. The coating efficiency was improved as the number of layer dip coated increased, which showed improvement in corrosion protection.

Item Type: Conference or Workshop Item (Lecture)
Uncontrolled Keywords: morphology; ZrO2; dip coating; corrosion; NaOH
Subjects: Q Science > Q Science (General)
T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Faculty of Mechanical Engineering
Depositing User: Dr. Wan Sharuzi Wan Harun
Date Deposited: 26 Dec 2017 08:02
Last Modified: 11 Apr 2018 03:00
URI: http://umpir.ump.edu.my/id/eprint/19654
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