A STUDY ON EROSION AND CORROSION BEHAVIOR OF Cr3C2-NiCr CERMET COATINGS

Pham Thi Ha, Nguyen Van Tuan, Le Thu Quy, Nguyen Tuan Anh, Pham Thi Ly, Ly Quoc Cuong, Dao Bich Thuy

Abstract


In this study, Cr3C2-25NiCr cermet coating samples were prepared by atmospheric plasma spraying (APS) technique on 410 stainless steel substrate with different plasma spraying parameters, namely, the plasma current (500 and 600 A), and the powder feed rate (10 and 30 g/min). The erosion-corrosion behaviour of the coatings was studied by electrochemical measurements, salt spray and erosion-corrosion tests. The electrochemical tests were performed in 3.5 wt.% NaCl solution. During the erosion-corrosion test, the samples were immersed in 3.5 wt.% NaCl solution containing 0.25 wt.% SiO2 particles with a rotational speed of 950 rpm for 72 hours. The obtained results showed that the plasma sprayed coating sample at the plasma current of 600 A and the powder feed rate of 10 g/min has a best erosion-corrosion resistance. Red rust spots did not appear on surface of this coating after 120 hours of salt spray test. It was much slower than on the others (after only 24 hours salt spray test). The weight loss of this coating during the erosion-corrosion test was lower than the remaining samples. These results are consistent with the results of electrochemical tests.

Keywords


plasma spraying, cermet coating, erosion-corrosion, Cr3C2-25NiCr

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DOI: https://doi.org/10.15625/2525-2518/56/3B/12785

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