Galvanic Corrosion Behavior of Copper Alloys in Simulated Deep-sea Low Temperature Environment

Open circuit potential monitoring, linear polarization measurements and other electrochemical means in simulated deep-sea environment were applied to explore the electrochemical corrosion behavior of commonly used ship piping materials B10 and silicon brass. By selfmade multi-channel measuring instrument for galvanic corrosion and corrosion weight loss, the galvanic corrosion behavior of B10 and silicon brass under low temperature and hypoxia conditions was investigated. The results show that the corrosion potential sequence of the materials was B10>silicon brass. B10 alloy acting as the couple cathode was protected from corrosion, while silicon brass was the sacrificial anode. The galvanic effect and the susceptibility of the coupling reduced with decreasing temperature. Because the temperature decreasing on the one hand reduced the driving force between cathode and anode, on the other hand weakened the polarization process.