This is done with relative ease because no actual " plating " of the mandrel occurs in the type of electrodeposition known as electroforming, unlike with electroplating, in which the adhesion of the new phase of metal is chemical and relatively permanent.
22.
"' Electrowinning "', also called "'electroextraction "', is the electrodeposition of metals from their ores that have been put in solution via a process commonly referred to as leaching . "'Electrorefining "'uses a similar process to remove impurities from a metal.
23.
Even though when formed by heat, it reverts to ?-Bi 2 O 3 when the temperature drops back below 727 �C, ?-Bi 2 O 3 can be formed directly through electrodeposition and remain relatively stable at room temperature, in an electrolyte of bismuth compounds that is also rich in sodium or potassium hydroxide so as to have a pH near 14.
