Last Updated：2025/12/30
Sentence
However,
approaching
energisation,
electrolytic
corrosion
was
discovered
between
the
copper
contact
wire
and
aluminium
beams
in
the
tunnel.
The
corrosion
was
caused
by
the
dissimilar
metals.
An
aluminium
contact
wire
system
which
prevents
electrolytic
corrosion
was
subsequently
developed,
tested
and
adopted
within
a
year,
and
replaced
the
earlier
copper
installation.
Quizzes for review
However, approaching energisation, electrolytic corrosion was discovered between the copper contact wire and aluminium beams in the tunnel. The corrosion was caused by the dissimilar metals. An aluminium contact wire system which prevents electrolytic corrosion was subsequently developed, tested and adopted within a year, and replaced the earlier copper installation.
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