Improving the structural properties and corrosion behaviour of electroless deposited Ni-P-Zn coatings on mild steel for advanced processes
Hydrated crystal of ZnSO<sub>4</sub>·7H<sub>2</sub>O was co-deposited with NiSO<sub>4</sub>·6H<sub>2</sub>O, and NaH<sub>2</sub>PO<sub>2</sub>·H<sub>2</sub>O processed electrolyte to develop a ternary phase electrole...
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AIMS Press
2020-10-01
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| Series: | AIMS Materials Science |
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| Online Access: | https://www.aimspress.com/article/10.3934/matersci.2020.4.441/fulltext.html |
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| author | Ojo Sunday Isaac Fayomi Adedamola Sode Itopa Godwin Akande Abimbola Patricia Idowu Popoola Oluranti Agboola |
| author_facet | Ojo Sunday Isaac Fayomi Adedamola Sode Itopa Godwin Akande Abimbola Patricia Idowu Popoola Oluranti Agboola |
| author_sort | Ojo Sunday Isaac Fayomi |
| collection | DOAJ |
| description | Hydrated crystal of ZnSO<sub>4</sub>·7H<sub>2</sub>O was co-deposited with NiSO<sub>4</sub>·6H<sub>2</sub>O, and NaH<sub>2</sub>PO<sub>2</sub>·H<sub>2</sub>O 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 H<sub>2</sub>SO<sub>4</sub> 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 Zn<sub>7</sub>Ni<sub>4</sub>P<sub>2</sub>, Zn<sub>2</sub>Ni<sub>5</sub>P, and Zn<sub>3</sub>Ni. Corrosion study established that Ni-P-Zn exhibits significant corrosion resistance at the optimum time within the examined environments with little SO<sub>4</sub><sup>2-</sup> and Cl<sup>-</sup> ions. |
| first_indexed | 2024-12-23T06:38:09Z |
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| id | doaj.art-1532a6e6f8494e989cbe7342c06bf9d8 |
| institution | Directory Open Access Journal |
| issn | 2372-0484 |
| language | English |
| last_indexed | 2024-12-23T06:38:09Z |
| publishDate | 2020-10-01 |
| publisher | AIMS Press |
| record_format | Article |
| series | AIMS Materials Science |
| spelling | doaj.art-1532a6e6f8494e989cbe7342c06bf9d82022-12-21T17:56:45ZengAIMS PressAIMS Materials Science2372-04842020-10-017444145210.3934/matersci.2020.4.441Improving the structural properties and corrosion behaviour of electroless deposited Ni-P-Zn coatings on mild steel for advanced processesOjo Sunday Isaac Fayomi0Adedamola Sode1Itopa Godwin Akande2Abimbola Patricia Idowu Popoola3Oluranti Agboola41 Department of Mechanical Engineering, Covenant University, P.M.B 1023, Ota, Nigeria3 Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, P.M.B. X680, Pretoria, South Africa1 Department of Mechanical Engineering, Covenant University, P.M.B 1023, Ota, Nigeria2 Department of Mechanical Engineering, University of Ibadan, Ibadan, Oyo state, Nigeria3 Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, P.M.B. X680, Pretoria, South Africa4 Department of Chemical Engineering, Covenant University, P.M.B 1023, Ota, NigeriaHydrated crystal of ZnSO<sub>4</sub>·7H<sub>2</sub>O was co-deposited with NiSO<sub>4</sub>·6H<sub>2</sub>O, and NaH<sub>2</sub>PO<sub>2</sub>·H<sub>2</sub>O 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 H<sub>2</sub>SO<sub>4</sub> 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 Zn<sub>7</sub>Ni<sub>4</sub>P<sub>2</sub>, Zn<sub>2</sub>Ni<sub>5</sub>P, and Zn<sub>3</sub>Ni. Corrosion study established that Ni-P-Zn exhibits significant corrosion resistance at the optimum time within the examined environments with little SO<sub>4</sub><sup>2-</sup> and Cl<sup>-</sup> ions.https://www.aimspress.com/article/10.3934/matersci.2020.4.441/fulltext.htmlmicrostructureelectrolesscoatingcorrosionapplication |
| spellingShingle | 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 AIMS Materials Science microstructure electroless coating corrosion application |
| title | Improving the structural properties and corrosion behaviour of electroless deposited Ni-P-Zn coatings on mild steel for advanced processes |
| title_full | Improving the structural properties and corrosion behaviour of electroless deposited Ni-P-Zn coatings on mild steel for advanced processes |
| title_fullStr | Improving the structural properties and corrosion behaviour of electroless deposited Ni-P-Zn coatings on mild steel for advanced processes |
| title_full_unstemmed | Improving the structural properties and corrosion behaviour of electroless deposited Ni-P-Zn coatings on mild steel for advanced processes |
| title_short | Improving the structural properties and corrosion behaviour of electroless deposited Ni-P-Zn coatings on mild steel for advanced processes |
| title_sort | improving the structural properties and corrosion behaviour of electroless deposited ni p zn coatings on mild steel for advanced processes |
| topic | microstructure electroless coating corrosion application |
| url | https://www.aimspress.com/article/10.3934/matersci.2020.4.441/fulltext.html |
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