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Enhancing Ni–B Coatings on 42CrMo4 Steel: Effects of Magnetic Stirring and Ultrasonic Agitation on Microstructure and Corrosion Performance

SU¨MRAN BILGIN, SAMET TOPAL

2025encoatingscorrosionmetallurgyultrasonicmagnetic stirring

Abstract

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This study explores the development of electroless nickel–boron (Ni–B) coatings on AISI4140 steel using sodium borohydride as a reducing agent, employing ultrasonic agitation and magnetic stirring. Electroless plating is preferred for its cost-effectiveness and ability to coat complex geometries. The Ni–B coated on 42CrMo4 steel was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), microhardness measurements, and electrochemical corrosion properties. The analysis reveals that magnetic stirring yields a thicker, more homogeneous coating with a characteristic cauliflower morphology. In contrast, ultrasonic agitation produces coatings with a mix of columnar and nodular structures. Corrosion resistance tests in NaCl solution show enhanced performance of Ni–B-coated samples over bare steel. The corrosion current density of 42CrMo4 steel is 9.44 x 10^-6 A/cm2. The corrosion current densities of the samples coated with magnetic stirring and ultrasonic agitation decreased by 1.38 x 10^-6 and 1.03 x 10^-6 A/cm2, respectively, increasing their corrosion resistance. This study highlights the significant impact of different stirring methods on the microstructural properties, surface quality, and corrosion resistance of Ni–B coatings.

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Cite This Work

@article{0eb61952-e9aa-4cf3-9c1c-14df26c92a4e,
  title={Enhancing Ni–B Coatings on 42CrMo4 Steel: Effects of Magnetic Stirring and Ultrasonic Agitation on Microstructure and Corrosion Performance},
  author={SU¨MRAN BILGIN and SAMET TOPAL},
  year={2025},
  language={en}
}
TY  - JOUR
TI  - Enhancing Ni–B Coatings on 42CrMo4 Steel: Effects of Magnetic Stirring and Ultrasonic Agitation on Microstructure and Corrosion Performance
AU  - SU¨MRAN BILGIN
AU  - SAMET TOPAL
PY  - 2025
LA  - en
ER  -

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