Effect of Co, Ni, Mo and W on the corrosion properties of amorphous electrospark coatings

A.A. Burkov, A.V. Zaytsev, V.O. Krutikova


The anticorrosive properties of amorphous coatings are improved when tungsten is added to their composition and cobalt is removed compared to the composition where all components are present.Coatings based on amorphous metals with a different number of elements: nickel, cobalt, molybdenum and tungsten, were obtained by electrospark deposition in a mixture of crystalline granules. The thickness of the deposited coatings was 20 to 33 μm. X-ray diffraction analysis showed a wide halo in the range of angles 2θ ~ 43 °, which indicates the predominance of the amorphous phase in the coating composition. The content of the amorphous phase, depending on the coatings composition, varied from 81 to 99 vol.%. The smallest fraction of the amorphous phase was observed in the coating without molybdenum. According to the EDS analysis, it was shown that the concentration of elements along the cross-section of coatings was constant, which indicates the homogeneity of the composition of the deposited coatings. A study by the SEM showed that the coatings have a homogeneous structure and do not have a precise boundary with the substrate which indicates good adhesion of the coatings to the substrate. Potentiodynamic polarization tests in 3.5% NaCl solution showed that amorphous coatings can improve of the corrosion resistance of the steel 35 surface up to 5 times. Tungsten reduced the rate of electrochemical corrosion of coatings, while cobalt worsen the corrosive properties of FeCrCoNiMoWCB coatings. A high-temperature corrosion test for 100 hours at temperature of 700°C showed that the samples with coatings were oxidized 3.4 to 7.9 times less than steel 1035. Barrier properties, under high-temperature gas corrosion, coatings without tungsten were ~ 2.3 times lower than coatings without cobalt.

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