超音速電弧噴涂NiAl復(fù)合涂層的電化學(xué)行為研究
[Abstract]:Aim to study the corrosion behavior and failure mechanism of NiAl composite coating in corrosion environment, and to provide theoretical basis for its practical application in engineering. Methods NiAl composite coatings were prepared on 20 # steel substrates by supersonic arc spraying, and the microstructure of the coatings was characterized. The polarization behavior and AC impedance spectrum behavior of the coating and substrate in 3.5%NaCl solution were studied. Results the surface layer of NiAl composite coating was mainly composed of Ni solid solution, NiAl intermetallic compound and a small amount of Al diffused through pores to the surface layer. The surface (Ni) porosity of the coating is 5.3 and the porosity of the bottom (Al) composite coating is lower than the self-corrosion potential of the 4.4%.NiAl composite coating. Can play a good cathodic protection effect. At the beginning of the test, because the thickness of the coating is up to 380 渭 m, the corrosion medium enters the coating through the microcracks and pores in the coating, and the coating is consumed rapidly, resulting in less insoluble corrosion products, lower coating impedance and faster corrosion rate. With the increase of corrosion time, the insoluble corrosion products gradually accumulate in the pores, and the polarization resistance in the coating increases rapidly, which plays the role of delaying corrosion. Conclusion the composite coating of NiAl has better corrosion resistance of Ni and passivation protection of Al, and combines the advantages of both, and shows better corrosion resistance. The self-sealing effect of the coating is the main reason for the increase of the coating impedance value.
【作者單位】: 西安石油大學(xué)材料科學(xué)與工程學(xué)院;
【基金】:陜西省重點(diǎn)學(xué)科專項(xiàng)資金資助項(xiàng)目(ys37020203) 西安石油大學(xué)優(yōu)秀碩士學(xué)位論文培育項(xiàng)目資助(2015yp140512)~~
【分類號(hào)】:TG174.4
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