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

作者：Niksefat Vahid; Ghorbani Mohammad

来源：Journal of Alloys and Compounds, 2015, 633: 127-136.

DOI：10.1016/j.jallcom.2015.01.250

• Electroless plating
• Ni-B-TiO2 composite coating
• Microstructure
• Corrosion

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 mu A/cm(2)) property over Ni-B coatings.

• 出版日期2015-6-5