Patent ID: 7465384

Claim:
A method comprising: a) passing an iron containing substrate into one or more electroplating cells containing a tin or tin alloy electrolyte, the tin or tin alloy electrolyte components comprise one or more sources of tin ions, 30 g/L to 120 g/L of sulfuric acid and 0.1 g/L to 10 g/L of sulfosalicylic acid, salts or isomers thereof; b) electrodepositing a tin or tin alloy on the iron containing substrate in the one or more electroplating cells; c) passing the iron containing substrate with the tin or tin alloy deposit from the electroplating cells into one or more dragout cells; and d) rinsing the iron containing substrate with the tin or tin alloy deposit in the one or more dragout cells with an electrolyte flowing counter-current to the iron containing substrate with the tin or tin alloy deposit, the electrolyte flowing counter-current contains concentrations of components at 5 wt % to 25 wt % of the components in the tin or tin alloy electrolyte in the one or more electroplating cells.