METHOD OF DECORATIVE ELECTROCHEMICAL ANODING OF SILVER SURFACE Russian patent published in 2018 - IPC C25F3/18 C25D11/34 

FIELD: electricity.

SUBSTANCE: method involves treating the silver surface in an aqueous solution of sodium thiosulfate Na₂S₂O₃×5H₂O - 790 g/l at a temperature of 35±2°C when using pulsed monopolar and bipolar currents of a rectangular shape with the following amplitude-time parameters: t_imp=0.1-10.0 ms, t_neg.imp=0.1-10.0 ms, the delay time of a negative polarity current pulse t_d=0.1-10.0 ms, t_pauses=0.1-10.0 ms, the current amplitude density in a pulse of positive polarity i_imp=0-5 A/cm², the amplitude current density in the negative polarity pulse i_neg.imp=0-5 A/cm² and the treatment time is 0.5-15.0 minutes, while the current is monopolar when i_neg.imp=0.

EFFECT: formation of passive decorative films resistant to environmental influences on the surface of 925 silver.

3 dwg