| http://www.w3.org/ns/prov#value | - , and water-soluble salts of these acids, such as sodium, potassium, ammonium and amine salts, with the coated non-ferrous base being connected as an anode under a voltage of about 8-15 volts, at a current 0 density of about 10 to about amperes per square decimeter, and at a temperature of about 20 to 80 C preferably C. There is a need to remove chemically defective or mechanically damaged nickel
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