Effect of Crystallization on Electrochemical and Tribological Properties of High-Velocity Oxygen Fuel (HVOF)-Sprayed Fe-Based Amorphous Coatings by Abdul Qadir Abbas Muhammad Arslan Hafeez Cheng Zhang Muhammad Atiq-ur-Rehman & Muhammad Yasir

Author:Abdul Qadir Abbas, Muhammad Arslan Hafeez, Cheng Zhang, Muhammad Atiq-ur-Rehman & Muhammad Yasir
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Tags: An Fe-based amorphous coating, with the composition Fe48Cr15Mo14C15B6Y2, was synthesized by the high-velocity oxygen fuel spray (HVOF) process on a substrate of AISI 1035. The effect of crystallization on the electrochemical and tribological properties of the HVOF-sprayed Fe-based coating was systematically studied. The XRD results validated the fully amorphous nature of the as-sprayed coating by showing a broad peak at 43.44 and crystallization of this coating after heat-treatment at 700 C by demonstrating sharp peaks of Fe-, Mo-, and Cr-based carbides. After crystallization, an increase in the corrosion current density from 4.95 Acm-2 to 11.57 Acm-2 and in the corrosion rate from 4.28 mpy to 9.99 mpy, as well as a decrease in the polarization resistance from 120 cm2 to 65.12 cm2, were observed, indicating the deterioration of the corrosion resistance of the as-sprayed Fe-based coating. This can be attributed to the formation of porous ferrous oxide, providing an easy channel for charge transfer and promoting pit formation. However, a decrease in the coefficient of friction from 0.1 to 0.05 was observed, highlighting the significant improvement in the wear resistance of the Fe-based coating after crystallization. This can be associated with the precipitation of hard carbides (MxCy) at the boundaries of the crystallized regions., Fe-based amorphous coating; crystallization; carbides precipitation; electrochemical properties; tribological properties


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