Corrosion Science and Technology

The Corrosion Science Society of Korea (한국재료부식학회)
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Improvement of Corrosion Resistance of Stainless Steel 316 by Electroless Phosphorus Nickel-Titania Composite Coating

  • Nabaa S. Radhi (Metallurgical Engineering Department, College of Material Engineering, University of Babylon) ;
  • Farah Sami Rasheed (Ministry of Education) ;
  • Zainab Al-Khafaji (Department of Civil Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia ) ;
  • Kulthoom Obaid Ali (Metallurgical Engineering Department, College of Material Engineering, University of Babylon) ;
  • Rasha Ghazi (Metallurgical Engineering Department, College of Material Engineering, University of Babylon)
  • Received : 2024.05.07
  • Accepted : 2024.12.09
  • Published : 2025.04.30
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Abstract

To enhance the functional performance of steel components in industrial and consumer applications, it is essential to address challenges such as corrosion susceptibility, environmental toxicity, and surface aesthetics. Consequently, electroless nickel-phosphorus (Ni-P) coatings on 316 stainless steel substrates have gained considerable attention. This study explores the deposition of low-phosphorus Ni-P coatings incorporated with titania (TiO2) particles, with sizes ranging from 10 to 30 ㎛. Coating solutions were formulated with TiO2 concentrations of 0, 5, and 10 g/L, and deposition durations were set at 30 and 60 minutes. The coated samples were systematically evaluated using coating thickness measurements, surface roughness analysis, Vickers hardness testing, energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM), and potentiodynamic polarization testing in 3.5% NaCl solution. Results revealed that the inclusion of TiO2 particles significantly enhanced the mechanical performance of the coatings, as evidenced by increased hardness values compared to both the bare substrate and TiO2-free Ni-P coatings. Additionally, electrochemical analysis indicated a marked improvement in corrosion resistance, with the TiO2-reinforced coating achieving a 74% reduction in corrosion rate relative to the uncoated steel. These findings suggest that TiO2-doped electroless Ni-P coatings are a promising solution for advanced surface engineering applications.

Keywords

References

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