Corrosion of Silver-Plated Copper Conductors - NEPP

Figure 18. Transverse and longitudinal sections
through red-plague corrosion site on sample no.
16. The braid consists of 144 strands, of which
only two-support copper corrosion. All strands are
of 2 m m silver-plated copper. The insulation
materials are black FEP for the outer jacket and
natural PTFE on the inner conductors. The
longitudinal sections show that galvanic corrosion
has initiated at local breaks in the silver plate
(after 10d of accelerated corrosion testing).
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a. Outer braid sectioned across site of worst
corrosion. Note braid has 144 strands, two
of which show signs of internal corrosion
b. Transverse section through worst
corrosion site (x 800)
c. Longitudinal section through worst
corrosion site (x 600)
ESA Journal 1984, Vol. 8