Effects of powder size and metallic bonding layer on corrosion behaviour of plasma-sprayed Al2O3-13% TiO2 coated mild steel in fresh tropical seawater |
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| Authors: | N.H.N. Yusoff M.J. Ghazali M.C. Isa A.R. Daud A. Muchtar |
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| Affiliation: | 1. Maritime Technology Division, Science And Technology Research Institute For Defence (STRIDE), c/o KD MALAYA, 32100 Pangkalan TLDM, Lumut, Perak, Malaysia;2. Department. of Mechanical & Materials Engineering, Faculty of Engineering & Built Environment, University Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia;3. School of Applied Physics, Faculty of Science & Technology, Universiti Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia |
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| Abstract: | This study focuses on the effects of powder size and Ni–Al bonding layer on the electrochemical behaviour of plasma-sprayed Al2O3-13% TiO2 coating in fresh tropical seawater. The presence of the metallic bonding layer reduces the coating porosity and increases the surface roughness for both microparticle and nanoparticle coatings. The nanoparticle exhibits better corrosion rate of 1.9×10−6 mmpy compared to the microparticle coating, with a corrosion rate of 3.05×10−6 mmpy. However, the presence of the metallic bonding layer increases the corrosion rate for both micro and nanoparticle coatings. The corrosion mechanism for the coating with and without the metallic bonding layer is discussed in detail. |
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| Keywords: | C. Corrosion D. Al2O3 D. TiO2 E. Structural applications |
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