Structure and Electrochemical Behaviors of FePSiBNb Nanostructured Coatings Prepared by High-speed Arc Spraying
SUN Bo1, CHENG Jiangbo1, LIU Qi1, FENG Yuan1, LIANG Xiubing2
1 College of Mechanics and Materials, Hohai University, Nanjing 211106; 2 National Institute of Defense Technology Innovation, Academy of Military Sciences PLA China, Beijing 100010
Abstract: FePSiBNb nanostructure coating was fabricated on Q235 steel substrate by high velocity electrical arc spraying process. The microstructure of coating was characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectrometer and transmission electron microscope. The electrochemical behaviors in 3.5% (mass fraction) NaCl solution of the coatings were studied by the electrochemical test with different immerse time. The results indicate that the FePSiBNb coating consists of nanoscale α-Fe phase, and the average size of the α-Fe crystalline is about 26 nm.The porosity of the coating is 1.6%. With the immerse time increasing, the potential of the coating is increasing from -826 mV at 1 h to -728 mV at 72 h at first, and then it decreases to -936 mV at 168 h. The corrosive current of the coating has a variation from 7.235 μA/cm2 at 1 h to 4.363 μA/cm2 at 72 h, and then it increases to 23.05 μA/cm2 at 168 h. Compared with the Q235 steel, the coating shows the better corrosion resistance.
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2018, Vol. 32 
