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DING Kunying, CHENG Taotao, WANG Zhiping. Corrosion resistance of different particle-density WC-10Co- 4Cr coatings[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2013, (1): 93-96.
Citation: DING Kunying, CHENG Taotao, WANG Zhiping. Corrosion resistance of different particle-density WC-10Co- 4Cr coatings[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2013, (1): 93-96.
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Corrosion resistance of different particle-density WC-10Co- 4Cr coatings

  • Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin 300300, China

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  • Received Date: November 17, 2011
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  • Two kinds of WC-10Co-4Cr coatings with different particle-density were deposited on 300M steel by high-velocity oxygen fuel (HVOF) technology. The microstructure and properties of WC-10Co-4Cr coatings were assessed by scanning electron microscope (SEM),X-ray diffraction (XRD) and micro-hardness tester. The corrosion resistance of the two kinds of coatings in a 3.5% NaCl solution was investigated by polarization test and immersion test. The results indicated that the porosity ratio of high particle-density coating was 1.52%,which was 1.95 times as big as that of low particle-density coating. In the NaCl solution,the value of passivation current density of high particle-density coating was 3.2 μA/cm2,which was 2.67 times as big as that of low particle-density coating. Therefore,low particle-density coating exhibited superior corrosion resistance than high particle-density coating due to its less porosity.
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