Preparation method of CrN-Cr-CrN composite protective coating on surface of Zr-4 cladding
A protective coating, zr-4 technology, applied in the coating, metal material coating process, ion implantation plating and other directions, can solve the problems of cladding failure, cracks, poor bonding force of zirconium alloy substrate, etc., to achieve enhanced bonding strength, simple preparation method, and the effect of improving bonding strength
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[0038] 1. Substrate pretreatment
[0039] (1) The sheet-shaped Zr-4 alloy is processed by wire cutting into a sheet-shaped substrate sample with a size of 20×20×2 mm, which is polished with 100 mesh, 400 mesh, 1200 mesh and 2000 mesh sandpaper in sequence, and the edges and corners are ground into rounded corners. Then use acetone, absolute ethanol and deionized water to repeatedly ultrasonically clean 3 times. Finally, the cleaned samples were dried for 1 h in a blast drying oven at a temperature of 70 °C.
[0040] (2) Put the sample after ultrasonic cleaning into the plasma machine, evacuate it through a mechanical pump for 15 minutes, pass in argon gas and maintain the pressure to 1.0pa, turn on the power, and use the plasma generated by passing in argon gas as the sample Etch and clean one piece, turn over after cleaning, and use the same process to etch and clean the other side. The etching and cleaning conditions are bias voltage -200V, the atmosphere is argon, the pr...
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