Morphology evaluation of ZrO2 dip coating on mild steel and its corrosion performance in NaOH solution

4th International Conference on Mechanical Engineering Research

Anwar, M.A.^1 ; Kurniawan, T.^1 ; Asmara, Y.P.^1 ; Harun, W.S.W.^2 ; Oumar, A.N.^3 ; Nandyanto, A.B.D.^4

Structural Materials and Degradation Focus Group, Faculty of Mechanical Engineering, Universiti Malaysia Pahang, Pekan, Pahang

26600, Malaysia^1

Human Engineering Group, Faculty of Mechanical Engineering, Universiti Malaysia Pahang, Pekan, Pahang

26600, Malaysia^2

Energy Sustainability Focus Group, Faculty of Mechanical Engineering, Universiti Malaysia Pahang, Pekan, Pahang

26600, Malaysia^3

Chemistry Department, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung

40154, Indonesia^4

关键词: Annealing process;    Coated substrates;    Coating efficiency;    Corrosion performance;    Dip-coating process;    Number of layers;    Polarization tests;    Tetragonal ZrO2;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/257/1/012087/pdf
DOI  :  10.1088/1757-899X/257/1/012087

来源: IOP

【 摘 要 】

In this work, the morphology of ZrO2thin 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 ZrO2coatings 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.