Effect of Electroless Ni-P Plating on the Mechanical Properties of Al-4%Ge Alloy

Abstract

In this study, the effect of electroless Ni P plating on the mechanical properties of Al 4Ge alloy was investigated. As the results, the following points were clarified. (1) Tensile strength of the specimen subjected to the Ni P plating after aging treatment or furnace cooling treatment was improved by about 10 in comparison to one of the non processed specimens. (2) Breaking elongation of the specimen subjected to the Ni P plating after aging treatment showed no significant changes in comparison to one of the non processed specimens. On the other hand, breaking elongation of the specimen subjected to Ni P plating after a furnace cooling treatment was reduced to 70 in comparison to one of the non processed specimens. (3) Fatigue strength of the specimen subjected to the Ni P plating after a furnace cooling treatment was overall reduced rather than one of non processed specimens. (4) Fatigue strength of the specimen subjected to the Ni P plating after aging treatment was overall reduced, except for the low stress region, rather than one of the non processed specimens. (5) In the specimen subjected to Ni P plating after a furnace cooling treatment or aging treatment, clear hydrogen desorption was recognized. On the other hand, there was only hydrogen desorption from a few of the non processed specimens.Especially, it is considered that the poor fatigue strength and ductility of the plating materials are mainly due to the interaction between the surface precipitates and hydrogen gas.

Synthesis and Characterization of Electroless Ni–P/Ni–Mo–P Duplex Coating with Different Thickness Combinations

“…As we all know, electroless binary nickel-phosphorus (Ni-P) plating has been widely applied in industry, due to its advantages of superior corrosion resistance, high surface hardness and wear resistance, simple operation and low cost. It also improves solderability and polishing property of the surface and prolongs the service life [5][6][7][8]. Currently, with the development of high industrial requirement, the binary Ni-P alloy cannot meet applications under special conditions, such as specific machine manufacture and the corrosion resistant components in seawater.…”