A Study Of Corrosion Of Zinc-coated Stranded
Steel Wire Used As Messenger Wire
Author(s)
T. Kuraoka & Y. Sato
Abstract
Zinc-coated stranded steel wires are widely used for messenger wires of the
overhead catenary system. Though these wires have been uniformly replaced
mainly based on aging, the corrosion speed of the wire, which is the main factor
of the degradation, is thoroughly different depending on the installed
environment. The purpose of this study is to propose a replacement period of
zinc-coated stranded steel wire according to the installed environment. In order
to investigate the corrosive situation of the messenger wire under the current
environmental conditions, we carried out the measurement of the residual
amount of zinc and iron of the wire installed under various environments by
using a deterioration detection device as developed by our laboratory, and
examined the relation between corrosion and aging. Consequently, the estimated
period for the zinc plating elimination was twenty years in seashore areas, thirty
years in city areas, and fifty years in mountainous areas respectively as the lower
estimate. On the other hand, there was almost no reduction in iron remains in
every environment because of the anticorrosive effect of zinc on iron. Moreover,
we carried out a tensile test and a vibration test in order to evaluate the relation
between corrosion and the mechanical characteristics of zinc-coated stranded
steel wires for which corrosion was accelerated by using the salt spray test
system. As a result, the vibration fatigue characteristic of the wires greatly
deteriorated when iron corroded. From these results, it was evident that the limit
of service life of messenger wires should be set at the time point when the zinc
plating disappeared. Furthermore, we confirmed that the ACM (Atmosphere
Corrosion Monitoring) sensor was useful as a method to estimate the corrosion
rate of zinc plating in each environment in a short period.
Keywords: corrosion, zinc-coated stranded steel wire, messenger wire, salt
spray test, atmosphere corrosion monitoring sensor.
Keywords
corrosion, zinc-coated stranded steel wire, messenger wire, salt
spray test, atmosphere corrosion monitoring sensor.
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