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http://dx.doi.org/10.5695/JKISE.2021.54.1.12

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

Shin, Byung-Hyun (The Institute of Materials Technology, Departments of Materials Science and Engineering, Pusan National University)
Chung, Won-Sub (Departments of Materials Science and Engineering, Pusan National University)
Publication Information
Journal of the Korean institute of surface engineering / v.54, no.1, 2021 , pp. 12-17 More about this Journal
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;
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