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Effect of Crystallization on Electrochemical and Tribological Properties of High-Velocity Oxygen Fuel (HVOF)-Sprayed Fe-Based Amorphous Coatings.
- Source :
- AppliedChem; Sep2024, Vol. 4 Issue 3, p270-281, 12p
- Publication Year :
- 2024
-
Abstract
- An Fe-based amorphous coating, with the composition Fe<subscript>48</subscript>Cr<subscript>15</subscript>Mo<subscript>14</subscript>C<subscript>15</subscript>B<subscript>6</subscript>Y<subscript>2</subscript>, 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 μAcm<superscript>−2</superscript> to 11.57 μAcm<superscript>−2</superscript> and in the corrosion rate from 4.28 mpy to 9.99 mpy, as well as a decrease in the polarization resistance from 120 Ωcm<superscript>2</superscript> to 65.12 Ωcm<superscript>2</superscript>, 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 26739623
- Volume :
- 4
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- AppliedChem
- Publication Type :
- Academic Journal
- Accession number :
- 180069433
- Full Text :
- https://doi.org/10.3390/appliedchem4030017