Aluminum-base rigid conductor lines are installed on subways and in narrow tunnels for their good maintainability and good current collection performance. However, aluminum tends to corrode and degrade due to the leakage of water in a tunnel. Therefore, we studied various measures against the corrosion degradation of the rigid conductor lines. In order to reduce the contact corrosion between different metals, it is confirmed that it is effective to plate the contact part with tin. As a result of accelerated corrosion degradation test, we confirmed that it has mechanical durability of 60 years in mountain tunnels.

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