Effect of ceramic particles on corrosion resistance of thermal sprayed stainless steel coating
Quan TANG1,2, Suo-de ZHANG2,*(), Min XU1,*(), Jian-qiang WANG2
1 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China 2 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
The ceramic particles of different types and sizes reinforced stainless steel composite coatings were successfully prepared by high-velocity air fuel (HVAF) spraying technique. The effects of the types and sizes of ceramic particles on the hardness, porosity and corrosion resistance of the composite coating were systematically studied. The microstructure, hardness and corrosion behavior of stainless steel/ceramic particle composite coating were systematically characterized and analyzed by scanning electron microscope, automatic hardness tester, Image Pro Plus software and electrochemical workstation. The results show that the larger brown alumina (Al2O3) particles reinforced stainless steel composite coating has low porosity (0.7863%), high hardness (637HV0.1) and excellent corrosion resistance, and its self-corrosion potential is -454.14 mV and self-corrosion current density is 22.208 mA·cm-2. The fine silicon carbide (SiC) particles reinforced stainless steel composite coating also has a relatively high hardness (600HV0.1) and good corrosion resistance, and its self-corrosion potential is -463.68 mV and self-corrosion current density is 23.738 mA·cm-2.
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