A tin coating immersion solution and a coating process using the same.

摘要

The invention provides an immersion coating bath solution for depositing a tin coating on a bimetal bearing having one portion thereof composed of an aluminum base metal and another portion of the surface thereof composed of a ferrous base, the solution having an acidic pH and comprising a water soluble stannous salt and a wetting agent. The invention also provides a process for depositing a tin coating on a bimetal bearing having one portion thereof composed of an aluminum base metal and another portion of the surface thereof composed of a ferrous base comprising immersing the bearing, without prior fluoride activation of the surface thereof, in the above immersion coating bath solution.