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Effect of Cu impurity content on the anode characteristics of Al-Zn-In series sacrificial anode
Pages: 51-56
Year: Issue:  1
Journal: Materials Science and Technology

Keyword:  aluminum alloysacrificial anodeCu impurityanti-corrosion propertyactive solutionelectrochemical test;
Abstract: To improve the anode performance of aluminum alloy anode,anode characteristics of Al- Zn- In sacrificial anodes with different Cu impurity content in the seawater were studied by electrochemical method,galvanic corrosion and ICP-MS. The results show that the sacrificial anode has good dissolution morphology by adding 0.005 wt.% Cu. Its working potential is between-1.047 !-1.068 V,and the current efficiency reaches93%. The coupling potential is negative and stable and the coupling current is moderate. The dissolved amount of Al and Zn are 22 ppb and 3. 8 ppb at 2 h,and the current peak values of 2 h and 48 h are 27 "A and36 " A. It means that the anti-corrosion property is enhanced. While the Cu content exceeds 0.005 wt.%,with the increasing of Cu content,the resistance of active solution increases gradually,which indicates that the activation of In is limited. The current efficiency of anode decreases obviously. It is found that the aluminum alloy material owns better anode characteristics with 0.005 wt.% Cu.
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