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

• Main Authors: M. A., Anwar, Kurniawan, Tedi, Asmara, Y. P., W. S., Wan Harun, Oumar, A. N., Nandyanto, A. B. D.
• Format: Conference or Workshop Item
• Language: English
• Published: IOP Publishing 2017
• Subjects: Q Science (General); TJ Mechanical engineering and machinery
• Online Access: http://umpir.ump.edu.my/id/eprint/19654/1/Morphology%20evaluation%20of%20ZrO2%20dip%20coating%20on%20mild%20steel%20and%20its%20corrosion%20performance%20in%20NaOH%20solution.pdf; http://umpir.ump.edu.my/id/eprint/19654/; https://doi.org/10.1088/1757-899X/257/1/012087
• Institution: Universiti Malaysia Pahang Al-Sultan Abdullah

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.