Stannous sulfate is used primarily in electroplating and as a dying agent.  Bright tin acid plating is more corrosion resistant than alkaline tin plating.  Acid tin plating is a process to create a mirror like finish on different metals like copper, brass, steel, etc.  This applies to several industries including: switch gears, electrical and electronics, bimetal bearing, etc.

Properties of Stannous Sulfate

Molecular Formula:SnSO4

Appearance:White-yellowish crystalline solid, deliquescent

Molecular Weight:214.75

Density : 4.15 g/cm³

Melting Point : 360 ºC

Boiling Point : 3.95

Solubility : Decomposes to SnO2 and SO2

Synonyms : Tin sulphate, Tin sulfate, Tin(2+) sulfate, Stannous sulphate, Tin(II) sulfate, Sulfuric acid