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Removal of tungsten carbide-cobalt coating by chemical method
Pages: 269-271
Year: Issue:  5
Journal: Electroplating & Finishing

Keyword:  titaniumsuperalloytungsten carbidecobaltplasma sprayed coatingremoval;
Abstract: The plasma sprayed WC–Co coatings on surface of GH4619 and TC4 alloys were removed by chemical method. The removal bath composition and treatment temperature were optimized through orthogonal test. The optimal process conditions are HNO3 30 mL/L, H2O2 550 mL/L, and treatment temperature 35 °C for removing WC–Co coating from GH4619 alloy substrate, and HNO3 70 mL/L, H2O2 550 mL/L, and treatment temperature 30 °C for TC4 substrate. The WC–Co coatings on the surfaces of both GH4169 and TC4 can be removed effectively by using the given processes. There is no obvious chemical corosion and hydrogen absorption phenomena on the substrates during removal processing. 1 L removal solution can be used to treat about 1 dm2 of 0.3 mm-thick WC–Co coating.
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