電析Ni-P合金の構造と腐食挙動

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  • Structure and Corrosion Behavior of Electrodeposited Ni-P Alloys

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The effect of phosphorus content on the structure and corrosion resistance of electrodeposited Ni-P alloys was investigated. The phosphorus content of the plated film decreased with increasing current density and decreasing H3PO3 content in plating electrolyte. X-ray diffraction revealed that the deposits containing 16.7-25.6at% P are amorphous, while 8.7 at% P alloy consists of the mixture of amorphous matrix with fcc crystals. The amorphous Ni-P alloy deposits (≥16.7at% P) possess excellent corrosion resistance compared with a Ni-8.7 P deposit containing crystalline fcc phase and a pure Ni deposit. The optical micrographs and EPMA analysis of the cross section of amorphous Ni-P deposits showed that the deposits were composed of finely spaced lamellar structure consisting of alternately low and high phosphorus content layers.

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