Method for protecting the supu00e9rfu00edcies of silver and silver alloys against the darkening.

摘要

Method for protecting the supu00e9rfu00edcies of silver and silver alloys against the darkening.Method for protecting the surfaces of silver and silver alloys against darkening, caractericado by: subjecting the surface to be treated initially with a pre - treatment in an organic solvent, immersing the surface of this clean way, in an acid solution capable of ensuring the training D And a thin layer of silver oxide.Immerse the surface thus oxidized in a solution of at least one thiol formula ch ~ 3 ~ (CH ~ 2 ~) ~ n ~ HS where n is between 10 and 16, chemically react the molecules that thiol with the silver surface previously oxidized in an atmosphere containing water vapor at a temperature of at least 50 198 C.