Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (54권1호 12-17)

Effect of concentration of H2SO4 on electrochemical properties of equipped Al sacrificial anode to prevent the corrosion and discolor of silver surface

은의 표면 부식 및 변색을 방지하기 위해 설치된 Al 희생양극의 전기화학적 특성에 미치는 황산 농도의 영향

신병현;정원섭;
Shin, Byung-Hyun;Chung, Won-Sub;

부산대학교, 재료공학과, 소재기술연구소;부산대학교, 재료공학부;
The Institute of Materials Technology, Departments of Materials Science and Engineering, Pusan National University;Departments of Materials Science and Engineering, Pusan National University;

DOI : 10.5695/JKISE.2021.54.1.12

Abstract

Among the various precious metals, silver is used in various fields because of its low price than other precious metals. However, the surface of silver remains after rain in the atmosphere containing sulfur ions and chlorine ions, causing silver corrosion and discoloration. Existing documents have developed a anode to prevent corrosion but that are concentrated on secondary batteries. This study tried to prevent corrosion and discoloration of silver by using an Al sacrificial anode. Sulfuric acid decreased the potential of silver and increased the current density at active polarization and OCP. The amount of corrosion of silver with the Al sacrificial anode was reduced from 0.5 % to 6.5%. When silver is used for decoration outside, corrosion and discoloration of silver can be suppressed by installing an Al anode.

Keywords

Silver;Al sacrificial anode;surface corrosion;discolor;sulfuric acid;