Microstructure and properties of open‐cell Ni–Sn–P alloy foams prepared by electroless plating

Abstract

In this study, open-cell Ni-Sn-P alloy foams were prepared by electroless plating. The influence of tin content on the surface morphology and properties of Ni-Sn-P alloy foams were investigated. The surface structure of Ni-Sn-P alloy foams became more uniform and compact with the increase of Sn content.The X-ray diffraction result showed that Ni-Sn-P alloy foams gradually transformed from an amorphous structure into crystallization with the increase of heat-treatment temperature. The introduction of Sn significantly enhanced the corrosion resistance of Ni-P coatings in 3.5 wt% NaCl solution, the corrosion current density decreased from 5.022 to 0.805 μA/cm 2 and the corrosion potential shifted positively from −0.423 to −0.294 V after adding 5.96 wt% Sn to Ni-P coatings. However, the corrosion resistance of Ni-Sn-P foams was deteriorated after heat treatment. Adding Sn to the Ni-P system slightly weakened the compressive strength of Ni-P binary foams. Nevertheless, significant improvement in the antioxidant performance of Ni-Sn-P alloy foams was indicated by the reduction of the mass change rate in that the mass change rate of Ni-P foams obviously reduced from 5.15% to 0.25% after adding 5.96 wt% Sn. K E Y W O R D Scorrosion resistance, electroless plating, heat treatment, Ni-Sn-P alloy foams, oxidation resistance

Electroless coating technology for 1060 aluminum alloy and the effect of tin chloride and ‎polymer addition

“…The effect of low tin additives on electroless Ni-P plating is investigated, with improved anticorrosion performance reported in a 3.5 percent NaCl solution [37]. The Ni-Sn-P alloy coating was superior to the Ni-P alloy in terms of surface smoothness and corrosion resistance [38]. Many studies have shown that Ni-Sn-P alloys with a lower amount of Sn applied to them have better anticorrosion properties than Ni-P deposits [32,39].…”