. The cleaning and electro-plating of metals; . 22 The Cleaning and Electro-Plating of Metals To Plate Nickel on Aluminum. Polish, clean (using No. 1, 2 ounces per gal-lon), followed by Oakite (^ ounce per gallon),rinse in cold water, dip into concentrated nitricacid, rinse in cold water, dip into: water, 1gallon; iron chloride, 1 ounce; muriatic, >^ounce; and from this dip rinse quickly and place. Fig. 5—Voltmeter used in by Weston Electric Company, Newark, N. J. directly in nickel solution. Plate with heavycurrent for 2 minutes, and then reduce
. The cleaning and electro-plating of metals; . 22 The Cleaning and Electro-Plating of Metals To Plate Nickel on Aluminum. Polish, clean (using No. 1, 2 ounces per gal-lon), followed by Oakite (^ ounce per gallon),rinse in cold water, dip into concentrated nitricacid, rinse in cold water, dip into: water, 1gallon; iron chloride, 1 ounce; muriatic, >^ounce; and from this dip rinse quickly and place. Fig. 5—Voltmeter used in by Weston Electric Company, Newark, N. J. directly in nickel solution. Plate with heavycurrent for 2 minutes, and then reduce solution: water, 1 gallon; single nickelsalts, 8 ounces; Epsom salts, 3 ounces; boricacid, 1 ounce; common salt, j^ ounce. Platewith 4 volts at 80° F. The Cleaning and Electro-Plating of Metals 23 COPPER PLATING. Copper Solution: Warm water 1 Gallon. Sodium cyanide 96/98% 3>^ Omices. Copper cyanide 70% 3 Ounces. Soda ash 58% 2 Ounces. Sodium hyposulphite y^, Ounce. • Copper cyanide contains 70% metal and 30%cyanogen, so a solution prepared as above willcontain ounces of copper in the form ofmetal per gallon of solution. If dense solutionsare required the metal content may be increased3^ to 4 ounces per gallon with the othermaterials in proportion. In replenishing coppersolutions with copper cyanide the followingproportions will equal 2 pounds of sodiumcyanide and 1 pound of copper
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