Compo­sition, structure and properties of electroless deposited nickel – phosphorus – copper coatings

  • Ludmila S. Tsybul’skaya Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus
  • Sergey S. Perevoznikov Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus
  • Vladislav S. Shendyukov Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus

Abstract

The nickel – phosphorus – copper functional coating was deposited on aluminum alloys substrate by chemical deposition method from malonate­glycinate nickel plating solution. The chemical and phase coatings composition was studied by X­ray fluorescence and X­ray phase analyze. Thermally stimulated phase transitions in deposited Ni – P – Cu coating were detected by differential scanning calorimetry method. The annealing at 250 and 400 °С was shown to lead to the changes in coating structure involving the transition from amorphous to amorphous­crystalline at 250 °С and to crystalline at 400 °С with Ni and Ni3P1 –  δ  phases forming. Changes in the structure of Ni–P coating results in the increase of microhardness by 1.6–1.7 times and wear resistance by 3– 4 times. Annealing at 400 °С led to decreasing of corrosion stability of the coatings in 3.5 % sodium chloride solution. The optimum physical, mechanical and protective properties has the attained in the case of Ni – P – Cu coating annealed at 250 °C.

Author Biographies

Ludmila S. Tsybul’skaya, Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus

PhD (chemistry); leading researcher at the laboratory of thin films chemistry

Sergey S. Perevoznikov, Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus

researcher at the laboratory of thin films chemistry

Vladislav S. Shendyukov, Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus

junior researcher at the laboratory of thin films chemistry

References

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Published
2019-08-30
Keywords: nickel – phosphorus – copper coating, composition, structure, annealing, corrosion protection properties, microhardness, wear resistance
Supporting Agencies The authors are grateful to A. S. Lyakhov, PhD (chemistry), docent, for performed unique XRD measurements at high temperatures.
How to Cite
Tsybul’skaya, L. S., Perevoznikov, S. S., & Shendyukov, V. S. (2019). Compo­sition, structure and properties of electroless deposited nickel – phosphorus – copper coatings. Journal of the Belarusian State University. Chemistry, 2, 62-68. https://doi.org/10.33581/2520-257X-2019-2-62-68