Mechanical Characterization of Electrodeposition of Ni-P Alloy Coating

Authors F. Lekmine1, 2 , H. Ben Temam1, M. Naoun3, M. Hadjadj4

1 Physics laboratory of Thin Layers and Applications, Biskra University, BP 145 RP, Biskra 07000, Algeria

2 Physics Department, ABBES Laghrour Khenchela University, P.O. 1252, 40004, Algeria

3 Corrosion Laboratory, Mechanical Department, Batna2 University, Batna 05000, Algeria

4 Laboratory for the Valorization and Promotion of Saharan Resources, Kasdi Merbeh Ouargla University, Algeria

Issue Volume 12, Year 2020, Number 1
Dates Received 18 September 2019; revised manuscript received 15 February 2020; published online 25 February 2020
Citation F. Lekmine, H. Ben Temam, M. Naoun, M. Hadjadj, J. Nano- Electron. Phys. 12 No 1, 01001 (2020)
PACS Number(s) 68.37.– d, 68.37.– Ps, 81.65.– b, 81.65.– Cf
Keywords Ni-P alloy coatings, Microhardness (2) , Corrosion (2) , Current density (4) , Potentiodynamic polarization, Electrodeposition (5) .

The electrodeposition process plays a crucial role in the formation of thin films on materials, in particular, the electrodeposition of nickel-phosphorus because of its important properties. In this study, Ni-P coatings were deposited on X52 steel substrates by electrodeposition technique from a solution containing nickel sulfate, sodium hypophosphite (NaH2PO2). Composition, surface morphology, and mechanical properties of the Ni-P deposits were studied using SEM, EDAX, the Vickers method, weight loss and potentiodynamic polarization techniques. The effects of the current density were investigated on the surface morphology, phosphorus content, microhardness and corrosion of the coatings. It was observed that both the phosphorus content and microhardness are dependent on the current density. Results demonstrate that the morphology of the electrodeposited Ni-P alloys shows that the grains are spherical in nature for all the samples. It has been observed that the influence of current density on the P content of the deposit is an inverse relation with phosphorous content and also the as-plated coatings at current density of 5 Am −  exhibit the superior microhardness. Corrosion tests show that 5 Am −  is the best current density value which gives the best protection coating against corrosion.

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