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Xingwu Qiu 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.7
Al2CoxCrCuFeNiTi high-entropy alloy coatings were prepared on Q235 steel by laser cladding. The structure was tested byscanning electron microscopy; the corrosion resistances of the alloys were tested by electrochemical workstation. The resultsshow that the microstructures of Ti2.0high entropy alloy are mainly equiaxed grains, spherical particles, white particles and"plum blossom" particles are distributed on it, columnar grains are located near the bonding zone. The corrosion resistanceof Al2CoCrCuFeNiTixhigh-entropy alloy coatings in 1 mol/L NaOH and 0.5 mol/L HCl solutions are excellent. In 1 mol/LNaOH solution, compared with Q235 steel, the corrosion current density of the coating decrease by 5 orders of magnitude,the corrosion potential increased by 0.03–0.34 V. In 0.5 mol/L HCl solution, compared with Q235 steel, the corrosion currentdensity of the coating decreases, the corrosion potential increased by 0.06–0.14 V. With the increase of Ti content,the corrosion resistance of Al2CoCrCuFeNiTixhigh-entropy alloy coating in 0.5 mol/L HCl solution is enhanced, while, in1 mol/L NaOH solution, the corrosion resistance of the coatings decreased. Cyclic polarization curves showed that negativehysteresis loops appeared in Ti0.5high-entropy alloy coating in 1 mol/L NaOH solution and Ti2.0high-entropy alloy coatingin 0.5 mol/L HCl solution, which indicated that the coatings has excellent pitting corrosion resistance.
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