Prev. 100Electrification by Cleavage1 Electrification by Pressure1 Electrization1 Electro Diagnosis1 Electro- Gilding1 Electro- Plating1Electro-biology1 Electro-capillarity1 Electrochemical cell1 Electro-chemical Equivalent1 Electro-chemical Equivalents1 Electro-chemical Series1 Electro–chemistry1 Electro-culture1 Electrode1 Electro-diagnosis1 Electro-dynamic Attraction andRepul...1 Electro-dynamic Rotation of Liquids1 Electro-dynamic. adj.1 Electro-dynamics1 Electrolier1 Electrolysis1 Electrolyte1 Electrolytic Analysis1 Electrolytic Cell1 Electrolytic Clock1 Electrolytic Conduction1 Electrolytic Convection2 Electrolytic Decomposition1 Electrolytic Deposit1 Electrolytic Gas1 Electrolytic Iron1 Electrolytic Resistance1 Electro-magnet1 Electro-magnetic Adherence1 Electro-magnetic Ammeter1 Electro-magnetic Attraction andRepu...1 Electro-magnetic Brake1 Electro-magnetic Clutch1 Electromagnetic coil1 Electro-magnetic Control1 Electro-magnetic Eye1 Electro-magnetic Field of Force1 Electro-magnetic Force1 Electro-magnetic Gun1 Electro-magnetic Induction2 Electro-magnetic Inertia1 Electro-magnetic Leakage1 Electro-magnetic Lines of Force1 Electro-magnetic Meter1 Electro-magnetic Mutual Induction1 Electro-magnetic Rotation of Liquid...1 Electro-magnetic Shunt1 Electro-magnetic Stress2 Electro-magnetic Theory of Light1 Electro-magnetic Unit of Energy1 Electro-magnetic Vibrator1 Electro-magnetic Waves1 Electro-magnetism1 Electromagnetism4 Electro-mechanical Bell1 Electro-mechanical Equivalent1 Electro-medical Baths1 Electro-metallurgy1 Electrometer1 Electrometer Gauge1 Electro-motive Force1 Electro-motive Force Curve1 Electro-motive Intensity1 Electro-motive Potential Difference1 Electro-motive Series1 Electro-motograph1 Electro-motor1 Electro-muscular Excitation1 Electro-negative. adj.1 Electro-optics1 Electrophoric Action1 Electrophorous1 Electro-physiology1 Electroplating1 Electroplating Dynamo1 Electro-pneumatic Signals1 Electropoion Fluid1 Electro-positive. adj.1 Electro-puncture1 Electro-receptive. adj.1 Electroscope1 Electrostatic Accumulator1 Electrostatic Attraction and Repuls...1 Electrostatic Circuit1 Electrostatic Equipotential Surface1 Electrostatic Field of Force1 Electrostatic Force1 Electrostatic Induction1 Electrostatic Lines of Force1 Electrostatic Mutual Induction1 Electrostatic Quantity1 Electrostatic Refraction1 Electrostatic Series1 Electrostatic Stress2 Prev. 100

Electro- Plating

The deposition of metal by electrolysis so as to coat the conducting surface of objects therewith. The full details of the many processes are very lengthy and cannot be given here.

The general principle includes a battery or source of electric current. The object to be plated is connected to the negative terminal and is immersed in the solution. Thus with a battery the object is in electrical connection with the zinc plate. To the other terminal a metallic plate is connected. The object and the plate termed the anode being introduced into a suitable bath, the metal whose solution is in the bath is deposited upon the surface of the object.

The bath is a solution of the metal in some form that will lend itself to the electrolytic action. The anode is often a plate of the metal of the bath, so that it dissolves as fast as metal is deposited on the object, thus keeping up the strength of the solution.

The objects to be plated must be scrupulously clean, and great care must be taken to keep the bath uncontaminated.

When the object has a non-conducting surface, it is made conducting by being brushed over with plumbago q.v. In addition iron dust is sometimes dusted over it. This acts by precipitating the metal of the bath directly and thus giving a conducting basis for the metal to deposit on. To avoid getting iron in a bath the object may be dipped in copper sulphate solution. This precipitates copper in place of the iron and leaves the article in good shape for silver or other plating.

Electro-plating, if made thick enough, gives a reverse of the article when separated therefrom. A direct copy can be got by a second plating, on the first plating after separation, or a wax impression can be employed.

Under the different metals, formulae for the baths will be found. (See also Quicking; Steeling; Plating Balance)