The structure and corrosion properties of quasicrystalline Al65Co20Cu15 and Al72Co18Ni10 reinforcement alloys and associated composite coatings produced by pressureless infiltration were studied. Copper-based L62 and BrOTs 10-2 alloys and aluminum-based AMg30 alloy were used as metallic matrices for the composite coatings. The structural and phase composition of the reinforcement alloys and coatings was determined by metallography, scanning electron microscopy, energy-dispersive X-ray spectrometry, and X-ray diffraction. The corrosion properties were studied in aqueous solutions of HCl, H2SO4, HNO3, and H3PO4 acids (pH = 1.0) for 1 to 4 h at room temperature. A quasicrystalline decagonal D phase was found to coexist with crystalline Al4(Co, Cu)3 and Al3(Cu, Co)2 phases in the Al65Co20Cu15 reinforcement alloy and Al9(Co, Ni)2 and Al(Co, Ni)2 phases in the Al72Co18Ni10 alloy. Corrosion tests in acid solutions revealed that the Al65Co20Cu15 reinforcement alloy had higher corrosion resistance in sulfuric and nitric acid solutions, while the Al72Co18Ni10 reinforcement alloy in hydrochloric and phosphoric acid solutions. In infiltration of the Al65Co20Cu15 and Al72Co18Ni10 reinforcement alloys, the molten copper-based L62 and BrOTs 10-2 matrices penetrated into the reinforcement along boundaries of the quasicrystalline D phase through the preferential dissolution of crystalline phases of the reinforcement alloys. Unlike the copper-based alloys, the aluminum-based AMg30 matrix did not penetrate inside the reinforcement alloys, dissolving predominantly the crystalline phases located in the surface layers. The highest corrosion resistance in the acidic environments was shown by the composite coatings with the BrOTs 10-2 matrix. The coatings with the AMg30 matrix had the lowest corrosion resistance because of the Al3Mg2 phase that emerged at interfaces between the reinforcement alloy and solidified matrix.
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Translated from Poroshkova Metallurgiya, Vol. 60, Nos. 7–8 (540), pp. 104–112, 2021.
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Sukhova, O., Polonskyy, V. Corrosion-Resistant Composite Coatings Reinforced by Decagonal Quasicrystals. Powder Metall Met Ceram 60, 472–479 (2021). https://doi.org/10.1007/s11106-021-00258-6
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DOI: https://doi.org/10.1007/s11106-021-00258-6