Zinc-coated stranded steel wire used as messenger wire in SHINKANSEN lines is installed above the track under various corrosion environments. The main factor of the degradation of zinc-coated stranded steel wire is corrosion. In order to grasp a suitable replacement cycle of zinc-coated stranded steel wire, we measured the residual amount of steel and zinc under the different environment conditions with corrosion degradation evaluation equipment and analyzed the removed samples. Moreover, in order to evaluate relation between corrosion and the mechanical characteristics, tensile test and vibration test were performed for both the removed samples and the samples which was exposed to accelerated degradation. As the result, it was confirmed that zinc disappearance was the main criterion for replacement. Furthermore, we tried to estimate a peorid up to disappearance of zinc under several environments by atmosphere corrosion monitoring (ACM) sensor.

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