Preparation and Characterization of Ni-diamond Composite Coatings Using Sedimentation Co-deposition Technique Alternative to Conventional Electrodeposition Technique

Hassan, AbdAllah Faisal; Ghayad, Ibrahim Mohamed; Maamoun, Maamoun; Abdel Hamid, Zeinab; El-Saeed, Fatma El-Zahraa M; Abdel-Khalek, Ahmed

doi:10.21608/ejchem.2020.33984.2722

Preparation and Characterization of Ni-diamond Composite Coatings Using Sedimentation Co-deposition Technique Alternative to Conventional Electrodeposition Technique

Document Type : Original Article

Authors

¹ Central Metallurgical Reseach and Development Institute

² Corrosion Control &amp; Surface Protection Lab., Metals Technology Dept., Central Metallurgical Research and Development Institute

³ Central Metallurgical Research and Development Institute

⁴ Central metallurgical research and development institute

⁵ Chemistry Dept. Fac. of Science, Cairo University

⁶ Chemistry Dept., Fac. of Sci., Benisuef University

10.21608/ejchem.2020.33984.2722

Abstract

Composite coatings are the techniques involving co-deposition of inert particles with metal/alloy in order to promote the hardness, wear and corrosion resistance of the coatings. Micro crystalline Ni based composite coatings were prepared by conventional electrodeposition method from a Watt's-type electrolyte containing different contents of diamond particles. A modified electro-deposition method called sedimentation co-deposition (SCD) was also used to deposit Ni-diamond composite coatings having more diamond particles in the Ni matrix.
Results show that Ni-diamond composite coating prepared by the SCD method contains quite high content of diamond (67-97%) as evidenced by EDS analysis. In contrary the traditional electrodeposition method shows low content of diamond (≈10-20%). The wear and corrosion resistance of the SCD Ni-diamond coating are markedly decreased in comparison to the conventionally electrodeposited coatings.

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