Abstract
The floating cages made of galvanized steel wire netting provided with cathodic protection treatment
using aluminum alloy anode, were installed at the inner bay and open sea respectively. The
results ; the floating cage installed at the inner bay could maintain its effective life of wire netting
for over 48 months, and that installed at the open sea up to 27 months.
Simultaneously, any meohanical wear or damage could scarcely be observed at the linked wire
crossing sections of the wire netting provided with cathodic protection treatment. It was also found
that the wear observed at the linked wire crossing sections without corrosion-proof treatment resulted
simply corrosion.
In addition, the wire gauge corrosion rate of 0.2φmm/yr was observed above the water line of
the wire netting of inner bay cage. In case of wire netting of open sea cage, however, the wear
and corrosion could scarcely be observed above the water line, as the wire netting frequently makes
contact with wave. And the anode service life of the open sea cage was approximate 1/2 that of
inner bay cage, as it is additionally applied with other open sea factors. However, it was confimed
that the wire netting can be successively provided with another cathodic protection treatment if new
anodes are supplemented.
