Silver-plated product and method for producing same

A method for producing a silver-plated product, the method comprising the steps of:

• preparing a silver-plating solution which is an aqueous solution containing silver potassium cyanide, potassium cyanide and a benzimidazole which is 0.5 to 5 (g/L) of 2-mercaptobenzimidazole or 10 to 50 (g/L) of 2-mercaptobenzimidazole sulfonic acid sodium salt dihydrate;
• and
• forming a surface layer of silver on a base material by electroplating at a current density in the silver-plating solution so as to satisfy A/D≥30 (g·dm2/L·A), B/D≤100(g·dm2/L·A) and C/D≥1.2 (g·dm2/L·A) assuming that a concentration of silver potassium cyanide in the silver-plating solution is A (g/L), that a concentration of potassium cyanide in the silver-plating solution is B (g/L), that the concentration of the benzimidazole in the silver-plating solution is C (g/L) and that the current density during the electroplating is D (A/dm2).

A method for producing a silver-plated product, the method comprising the steps of:

• preparing a silver-plating solution which is an aqueous solution containing silver cyanide, sodium cyanide and a benzimidazole, the concentration of sodium cyanide being 30 to 80 (g/L) the benzimidazole being 0.5 to 5 (g/L) of 2-mercaptobenzimidazole or 10 to 50 (g/L) of 2-mercaptobenzimidazole sulfonic acid sodium salt dihydrate;
• and
• forming a surface layer of silver on a base material by electroplating at a current density in the silver-plating solution so as to satisfy A/D≥15 (g·dm2/L·A) and C/D≥1.2 (g·dm2/L·A) assuming that a concentration of silver cyanide in the silver-plating solution is A (g/L), that the concentration of sodium cyanide in the silver-plating solution is B (g/L), that the concentration of the benzimidazole in the silver-plating solution is C (g/L) and that the current density during the electroplating is D (A/dm2).

A method for producing a silver-plated product, the method comprising the steps of:

• preparing a silver-plating solution which is an aqueous solution containing silver cyanide, sodium cyanide and a benzimidazole which is 0.5 to 5 (g/L) of 2-mercaptobenzimidazole or 10 to 50(g/L) of 2-mercaptobenzimidazole sulfonic acid sodium salt dihydrate;
• and
• forming a surface layer of silver on a base material by electroplating at a current density in the silver-plating solution so as to satisfy A/D≥15 (g·dm2/L·A), B/D≤150 (g·dm2/L·A) and C/D≥1.2 (g·dm2/L·A) assuming that a concentration of silver cyanide in the silver-plating solution is A (g/L), that a concentration of sodium cyanide in the silver-plating solution is B (g/L), that the concentration of the benzimidazole in the silver-plating solution is C (g/L) and that the current density during the electroplating is D (A/dm2).