Corrosion Behavior and Wear Resistance Characteristics of Electroless Ni-P-CNTs Plating on Carbon Steel

摘要

Electroless Ni-P-CNTs plating is used to find the influence regularity of different CNTs concentrationon the properties of the composite coating宨ncluding corrosion resistance, wear resistance and surfacehardness. The results show that CNTs intersperse in the gaps between the deposited metal particles andthe size of the metal particles is much smaller than the size of the metal particles which aren wrappedwith CNTs. The codeposition of Ni-P-CNTs can work as a kind of lubricant between the coating andthe other friction body. Compared to the Ni-P coating, the wear resistance and the surface hardnessvalue of Ni-P-CNTs coating are better, and they become much better with the increase of the CNTsconcentration. The addition of CNTs makes the coating denser, thus compared with Ni-P coating, thecorrosion resistance of composite coating is better. But too much CNTs deposited on the substrateoccupy the position of the nickel and phosphorus, leading to a large area of the carbon nanotubeswrapped together which is very unfavorable to coating, resulting in the corrosion potential of thecomposite coating becoming negative gradually, indicating the corrosion resistance of the compositecoating becomes worse.