Patent ID: 6923899

Claim:
A solution for use in the electroplating of tin and tin alloys comprising: a basis solution comprising an acid, optionally a salt thereof, selected from the group consisting of fluoboric acid, an alkane sulfonic acid, or a combination thereof; divalent tin ions; one or more surfactants with a cloud point higher than 33° C.; and an antioxidant compound at a concentration range of at least 0.1 g/l to less than 1 g/l, the antioxidant compound having a formula: wherein Y is selected from the group consisting of H, alkali metal ions, alkaline earth metal ions, transition metal ions, and ammonium ions, wherein a is 0, 1, 2, or 3, b is 1, 2, 3, 4, or 5, and the sum of a and b is equal to 2, 3, 4, or 5, and R is selected from the group consisting of, halogen, CN, COOY, C 1 -C 3 alky, substituted C 1 -C 3 alkyl, and C 1 -C 3 alkoxy, wherein said alkyl substitutions are selected from the group consisting of straight chain or branched alkoxy, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, acyl, phenyl, halosubstituted phenyl, heteroaryl, halogen, hydroxyl, cyano, or combinations comprising at least one of the foregoing.