40 - Treatment of materials; recycling, air and water treatment,
Goods & Services
Metallurgical processing; Electrochemical treatment; Blast treatment; Metal treating; Treating [stamping] of metal; Textile treating; Metal treating; Heat treatment of ores; Heat treatment of metal surfaces; Metal treating; Treatment of semi-manufactured products by means of electrolysis; Treatment and coating of metal surfaces; Treatment and processing of plastics; Material treatment information; Blast treatment of a surface (Services for the -); Treatment of metal parts to prevent corrosion; Treatment and processing of ores and ore concentrates; Treatment of metal parts to prevent corrosion using hot-dip galvanizing and powder coating processes.
40 - Treatment of materials; recycling, air and water treatment,
Goods & Services
Metallurgical processing; Electrochemical treatment; Blast treatment; Metal treating; Treating [stamping] of metal; Textile treating; Metal treating; Heat treatment of ores; Heat treatment of metal surfaces; Metal treating; Treatment of semi-manufactured products by means of electrolysis; Treatment and coating of metal surfaces; Treatment and processing of plastics; Material treatment information; Blast treatment of a surface (Services for the -); Treatment of metal parts to prevent corrosion; Treatment and processing of ores and ore concentrates; Treatment of metal parts to prevent corrosion using hot-dip galvanizing and powder coating processes.
3.
IMPROVED PROCESS FOR PROTECTING SURFACES OF NOBLE METALS AND/OR OF THEIR ALLOYS AGAINST TARNISHING.
An improved process for protecting surfaces of noble metals and/or of their alloys against tarnishing, characterised by comprising the following steps in sequence: - subjecting the surface to be treated to cathodic degreasing, - expos i ng the surface cleaned i n th is m anner to an acid so l ution i n concentration such as to ensure the formation of a thin layer of an oxide of the noble metal of said surface, - inside a nebulization chamber (20), subjecting the surface oxidized in this manner to sprinkling with a solution comprising at least one thiol, - after extracting the surface treated in this manner from the nebulization chamber, heating said surface to a tem perature such as to promote the formation of a covalent chemical bond between said surface and said thiol.
C23C 22/02 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using non-aqueous solutions
nSH where n is between 10 and 16; and chemically reacting the molecules of said thiol with the previously oxidized silver surface, in an environment containing water vapor at a temperature of at least 50° C.
C23C 22/48 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH < 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
B05D 1/18 - Processes for applying liquids or other fluent materials performed by dipping
B82Y 30/00 - Nanotechnology for materials or surface science, e.g. nanocomposites
B82Y 40/00 - Manufacture or treatment of nanostructures
C23C 22/02 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using non-aqueous solutions
B05D 3/04 - Pretreatment of surfaces to which liquids or other fluent materials are to be appliedAfter-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
