Corrosion resistance of plasma sprayed NiCrAl+£¨ZrO₂+Y₂O₃£© thermal barrier coating on 18-8 steel surface

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Key words£ºplasma spraying£» NiCrAl+£¨ZrO₂+Y₂O₃£© coating£» corrosion resistance

Abstract: The corrosion resistance of NiCrAl+£¨ZrO₂+Y₂O₃£©thermal barrier coating, formed with the plasma spraying technique, on the 18-8 steel surface was investigated. The phase structure and morphology of the coating were analyzed by means of X-ray diffraction£¨XRD£© and scanning electron microscopy£¨SEM£©. The electrochemical corrosion behavior of the coating in 1.0¤@mol/L H₂SO₄ solution was studied by using electrochemical measurement methods. The results show that the gradient plasma spraying coating is composed of the NiCrAlY primer coating and the £¨ZrO₂+Y₂O₃ £© top coating, and the coating thickness is 360¤@¦Ìm. The microhardness of coating reaches 1¤@100¤@HV. The corrosion resistance of the plasma sprayed coating of the 18-8 steel surface is about 5 times as great as that of the original pattern. The corrosion resistance of the coating is enhanced notably.