Patent ID: 8585811

Claim:
An aqueous nickel phosphorus tin alloy electroless plating bath for plating a substrate, the plating bath comprising: at least one source of nickel ion, wherein the at least one source of nickel ion is provided in a range from about 1-15 g/L; a hypophosphite salt as a reducing agent, wherein the hypophosphite salt is provided in a range from about 10-50 g/L; at least one chelating agent, wherein the at least one chelating agent is provided in a range from about 1-65 g/L; an auxiliary bath stabilizer, wherein the stabilizer is provided in a range≦1 g/L; and at least one source of stannous ion which comprises tin methane sulfonate, wherein the at least one source of stannous ion is provided in a range from about 0.001 to about 0.1 g/L, wherein the plating bath is maintained at a pH between 4-5.