Improving the structural properties and corrosion behaviour of electroless deposited Ni-P-Zn coatings on mild steel for advanced processes

Ojo Sunday Isaac Fayomi; Adedamola Sode; Itopa Godwin Akande; Abimbola Patricia Idowu Popoola; Oluranti Agboola; Ojo Sunday Isaac Fayomi; Adedamola Sode; Itopa Godwin Akande; Abimbola Patricia Idowu Popoola; Oluranti Agboola

doi:10.3934/matersci.2020.4.441

AIMS Materials Science

2020, Volume 7, Issue 4: 441-452. doi: 10.3934/matersci.2020.4.441

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Research article

Improving the structural properties and corrosion behaviour of electroless deposited Ni-P-Zn coatings on mild steel for advanced processes

1.
Department of Mechanical Engineering, Covenant University, P.M.B 1023, Ota, Nigeria
2.
Department of Mechanical Engineering, University of Ibadan, Ibadan, Oyo state, Nigeria
3.
Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, P.M.B. X680, Pretoria, South Africa
4.
Department of Chemical Engineering, Covenant University, P.M.B 1023, Ota, Nigeria

Received: 21 April 2020 Accepted: 16 June 2020 Published: 23 July 2020

Hydrated crystal of ZnSO₄·7H₂O was co-deposited with NiSO₄·6H₂O, and NaH₂PO₂·H₂O processed electrolyte to develop a ternary phase electroless coating on mild steel for advanced application. The coating was produced in an aqueous nickel electrolyte solution with zinc at a temperature of 90 ℃ and varying time conditions between 20 and 50 min. The effects of the developed coatings on microstructure and physical properties were investigated using scanning electron microscopy (SEM), Energy dispersive spectroscopy (EDS), and optical microscopy. The corrosion characteristics of the coatings examined in 0.5 M H₂SO₄ and 3.5% NaCl were analyzed using linear potentiodynamic polarization technique. The microstructure revealed that the constituent deposited on the steel. A more uniformly distributed crystallite with minimal pores was observed at 20 min of Ni-P-Zn coating, while the tiniest film was observed at 50 min of the coating without crack. There was also a fully compact grain within the intermetallic matrix of the coating due to the synergetic effect of the electrolyte constituent with the strengthening phase of Zn₇Ni₄P₂, Zn₂Ni₅P, and Zn₃Ni. Corrosion study established that Ni-P-Zn exhibits significant corrosion resistance at the optimum time within the examined environments with little SO₄^2- and Cl^- ions.
- microstructure,
- electroless,
- coating,
- corrosion,
- application
Citation: Ojo Sunday Isaac Fayomi, Adedamola Sode, Itopa Godwin Akande, Abimbola Patricia Idowu Popoola, Oluranti Agboola. Improving the structural properties and corrosion behaviour of electroless deposited Ni-P-Zn coatings on mild steel for advanced processes[J]. AIMS Materials Science, 2020, 7(4): 441-452. doi: 10.3934/matersci.2020.4.441

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Abstract

Hydrated crystal of ZnSO₄·7H₂O was co-deposited with NiSO₄·6H₂O, and NaH₂PO₂·H₂O processed electrolyte to develop a ternary phase electroless coating on mild steel for advanced application. The coating was produced in an aqueous nickel electrolyte solution with zinc at a temperature of 90 ℃ and varying time conditions between 20 and 50 min. The effects of the developed coatings on microstructure and physical properties were investigated using scanning electron microscopy (SEM), Energy dispersive spectroscopy (EDS), and optical microscopy. The corrosion characteristics of the coatings examined in 0.5 M H₂SO₄ and 3.5% NaCl were analyzed using linear potentiodynamic polarization technique. The microstructure revealed that the constituent deposited on the steel. A more uniformly distributed crystallite with minimal pores was observed at 20 min of Ni-P-Zn coating, while the tiniest film was observed at 50 min of the coating without crack. There was also a fully compact grain within the intermetallic matrix of the coating due to the synergetic effect of the electrolyte constituent with the strengthening phase of Zn₇Ni₄P₂, Zn₂Ni₅P, and Zn₃Ni. Corrosion study established that Ni-P-Zn exhibits significant corrosion resistance at the optimum time within the examined environments with little SO₄^2- and Cl^- ions.

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