Development of electrical insulating surface on copper-nickel alloy wire used in naval instruments

THE copper-nickel alloy wire used for close-wound
resistors in Naval instruments is an oxidized wire
having 0.001 cm thick oxide which offers electrical
insulation to a potential difference of about 15
volts. At present, the oxidized wire used by the Navy
is of imported origin. A problem has, therefore, arisen
to develop a process for producing the oxidized wire
locally. Work was, therefore, taken in Naval Chemical
and Metallurgical Laboratory, Bombay, to find the expe-rimental conditions to produce the oxidized layer
with requisite electrical insulation characteristics.