Improvement of Corrosion Resistance of Stainless Steel 316 by Electroless Phosphorus Nickel-Titania Composite Coating
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
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 incor-porated with titania (TiO 2 ) particles, with sizes ranging from 10 to 30 µm. Coating solutions were formulated with TiO 2 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 theinclusion of TiO 2 particles significantly enhanced the mechanical performance of the coatings, as evidenced by increased hardness values compared to both the bare substrate and TiO 2 -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. Thesefindings suggest that TiO 2 -doped electroless Ni-P coatings are a promising solution for advanced surfaceengineering applications.
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 incor-porated with titania (TiO 2 ) particles, with sizes ranging from 10 to 30 µm. Coating solutions were formulated with TiO 2 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 theinclusion of TiO 2 particles significantly enhanced the mechanical performance of the coatings, as evidenced by increased hardness values compared to both the bare substrate and TiO 2 -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. Thesefindings suggest that TiO 2 -doped electroless Ni-P coatings are a promising solution for advanced surfaceengineering applications.