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Studies on the electrodeposition,structure and properties of Ni - W/ZrO_2 composite coating before and after heat treatment

【摘要】:正Ni-W/ZrO_2 composite coating was prepared by electrodeposition from a Ni-W bath containing zirconia solid particles suspended in the electrolyte solution by stirring.The presence of zirconia particles influenced the electrodeposition,surface morphology,crystallographic structure,thermal treatment and corrosion resistance of the obtained composite coating.Comparison to Ni-W alloy electrodeposition,both W content in Ni-W matrix and deposition current efficiency for the composite coating were decreased.After heat treatment at 400℃for 1 hour,some embedded zirconia particles have been gotten rid of the Ni-W matrix,and W has been segregated to the top surface of the deposit.SEM results revealed that the composite coating was in granular structure and crack-free.DSC experiment combined with X ray diffractometry indicated that the structures have been changed from nanocrystalline for Ni-W alloy to amorphous for the composite coating,which caused the composite coating in a higher microhardness and better corrosion resistance.After heat treatment the microhardness and corrosion resistance in 3 wt% NaCl solution were enhanced to a greater extent.

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