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Mechanical and electrochemical properties of ultrasonic-assisted electroless deposition of Ni-B-TiO2 composite coatings

Niksefat, V ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jallcom.2015.01.250
  3. Publisher: Elsevier Ltd , 2015
  4. Abstract:
  5. Nickel-Boron-Titania (Ni-B-TiO2) composite coatings were successfully obtained on mild steel (St-37) by simultaneous electroless deposition. TiO2 particles were dispersed in a suspension by ultrasonic irradiation. The surface morphology, particle size, elemental composition and phase analysis of the coatings were characterized by scanning electron microscopy (SEM), inductively coupled plasma (ICP) and X-ray diffraction (XRD). The hardness and friction coefficient of as- plated and heat treated Ni-B and Ni-B-TiO2 composite coatings were determined by Vickers diamond indentation and indentation scratch tests and compared with Ni-B coatings. As a result, the hardness (1263 HV) of the as-plated Ni-B-TiO2 coatings was improved significantly. In addition, the corrosion resistance behavior of the as-plated and heat treated Ni-B and Ni-B-TiO2 coatings were analyzed by anodic polarization and electrochemical impedance spectroscopic (EIS) studies in a 3.5 wt.% NaCl solution. The as-plated composite coatings (Ni-B-TiO2) exhibited enhanced corrosion resistance (0.2 μA/cm2) property over Ni-B coatings
  6. Keywords:
  7. Ni-B-TiO2 composite coating ; Carbon steel ; Corrosion ; Corrosion resistance ; Deposition ; Electrochemical corrosion ; Electroless plating ; Friction ; Hardness ; Heat resistance ; Inductively coupled plasma ; Microstructure ; Nickel ; Nickel coatings ; Particle size ; Particle size analysis ; Scanning electron microscopy ; Suspensions (fluids) ; Titanium dioxide ; X ray diffraction ; Electrochemical impedance ; Elemental compositions ; Friction coefficients ; Inductively coupled plasma (ICP) ; Ni-b coatings ; Phase analysis ; TiO ; Ultrasound irradiation ; Composite coatings
  8. Source: Journal of Alloys and Compounds ; Volume 633 , 2015 , Pages 127-136 ; 09258388 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0925838815003485