Study of nickel titanium dioxide coating prepared by electrodeposition

Zainuddin, Irne (2018) Study of nickel titanium dioxide coating prepared by electrodeposition. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Electrochemical deposition process has been extensively studied as it is one of promising processes to form metal matrix ceramic coating without significantly changing crystalline structure of the initial powder material. In sequence to that, most of conventional thermal spray processes change the structure of initial phase powder due to high processing temperature during the coating process. Therefore, this study discuss on how to prepare ceramic coating with minimum time consumption using electrochemical deposition process by utilizing TiO2 powder as the raw material. The main objective of this study is to deposit TiO2 coatings on the substrates with enhancing nickel properties using an approach of electrochemical deposition technique. The effects of electrochemical deposition process by varying the composition of TiO2 powder on aluminium substrates evaluated in this study. TiO2 as second phase particle was incorporated into the Ni coating to improve the surface mechanical properties. In this study aluminium will act as reference electrode (cathode) and Ni plate acted as the counter electrode (anode), while direct current and electrolyte also have been used to complete the electrodeposition process. Moreover, the deposition mechanism of electrochemical deposition technique also influenced the hardness and surface roughness of substrates. The availability and compositions of coatings were characterized by X-ray diffraction spectrum (XRD), energy dispersive X-ray spectroscopy (EDX), surface roughness machine and surface hardness machine. In the Ni – TiO2 coating matrix, the results of the tests indicates that with the addition of TiO2, the microstructure of Ni – TiO2 coating drastically changes and tends to be in coagulated forms. The presence of TiO2 in Ni – TiO2 was confirmed through the test result from EDX and XRD. However, just a small peak of TiO2 was detected of the Ni –TiO2 coating based on XRD test. As the incorporation of TiO2 composition increases the microhardness and surface roughness of the coatings also increase.

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