Designation: Sn-Bi
Synonyms: Tinning.
Price: from 10 rub. per dm2
Purpose: Tin coating on aluminum is used to enhance corrosion resistance, improved solderability, elimination of contact of aluminum with copper conductors, creation of an easily break-in layer on rubbing surfaces. Without a technological copper or chemical-nickel sublayer, tin plating of aluminum is impossible. The thickness of the sublayers is usually minimal and such sublayers are not indicated on the drawing (unlike multilayer tinning).
Adding bismuth to the coating allows you to: maintain solderability for up to 1 year, slow down the transition of the plastic white modification of tin to powder gray, and level out needle formation.