**Nyambura Samuel Mbugua, Min Kang \*, Yin Zhang, Ndumia Joseph Ndiithi, Gbenontin V. Bertrand and Liang Yao**

College of Engineering, Nanjing Agricultural University, Nanjing 210031, China; 2017112123@njau.edu.cn (N.S.M.); 2018212003@njau.edu.cn (Y.Z.); 2017112122@njau.edu.cn (N.J.N.); 2019212016@njau.edu.cn (G.V.B.); 2018112003@njau.edu.cn (L.Y.) **\*** Correspondence: kangmin@njau.edu.cn; Tel.: +86-25-5860-6578

Received: 1 July 2020; Accepted: 3 August 2020; Published: 6 August 2020

**Abstract:** In recent years, alloy and alloy-ceramic coatings have gained a considerable attention owing to their favorable physicochemical and technological properties. In this review, we investigate Ni, NiCo alloy and NiCo–ceramic composite coatings prepared by electrodeposition. Electrodeposition is a versatile tool and cost-effective electrochemical method used to produce high quality metal coatings. Surface finish and tribological properties of the coatings can be further improved by the addition of suitable agents and control of deposition operating conditions. In this review, Ni, NiCo alloy and NiCo–ceramic composite coatings prepared by electrodeposition are reviewed by critically evaluating previous researches. The use of the coatings and their potential for future research and development are discussed.

**Keywords:** nanostructured coatings; microhardness; corrosion resistance; electrochemical deposition
