Prev. 100Electro-negative. adj.1 Electro-optics1 Electrophoric Action1 Electrophorous1 Electro-physiology1 Electroplating1Electroplating 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 Electrostatic Telephone1 Electrostatic Voltmeter1 Electrostatics1 Electro-therapeutics or Therapy1 Electrotherapy2 Electro-thermal Equivalent1 Electrotonic State1 Electrotonus1 Electrotype1 Elegant1 Elegant extracts1 Elegy1 Elegy Written in a Country Churchya...1 Ele-lendisch1 Element of a Battery Cell1 Element of Battery1 Elements1 Elendisch1 Elenge1 Elengelich1 Eleonora Falcon1 Elephant6 Elephant seal1 Elephants1 Elephants in Thailand1 Elephant’s trunk1 Elephas1 Eleusis1 Elevated1 Elevation1 élève1 Elf3 Elf-lock1 Elf-queen1 Eli (biblical figure)1 Elias Ashmole1 Elias’ Method Magnetization1 Eliche1 Elihu Burritt1 Elijah3 Elijah Fenton1 Elim1 Eliot Bartholomew Geo Warburton1 Elis1 Elisha1 Elissa1 élite1 Elivagar1 Elixir1 Eliz.1 Eliza Cook1 Eliza Hayward1 Eliza Hessel6 Eliza Lynn Linton1 Eliza Stephenson1 Eliza Tabor1 Eliza Wilkinson1 Elizabeth Barrett Browning4 Elizabeth Carter1 Elizabeth Cleghorn Gaskell1 Elizabeth Ferguson1 Elizabeth Fry7 Elizabeth Gordon, Duchess of Gordon6 Elizabeth Hamilton1 Elizabeth I of England44 Elizabeth Inchbald1 Elizabeth Missing Sewell1 Elizabeth Montagu1 Elizabeth Rundle Charles1 Elizabeth Sara Sheppard1 Elizabeth Steele1 Elizabeth Zane1 Elizabeth, Grace, and Rachel Martin1 Elizabethan Period1 Prev. 100


The deposition by electrolysis of a coating of metal upon a conducting surface. The simplest system makes the object to be plated the negative electrode or plate in a galvanic couple. Thus a spoon or other object may be connected by a wire to a plate of zinc. A porous cup is placed inside a battery jar. The spoon is placed in the porous cup and the zinc outside it. A solution of copper sulphate is placed in the porous cup, and water with a little sodium or zinc sulphate dissolved in it, outside. A current starts through the couple, and copper is deposited on the spoon.

A less primitive way is to use a separate battery as the source of current; to connect to the positive plate by a wire the object to be plated, and a plate of copper, silver, nickel or other metal to the other pole of the battery. On immersing both object and plate (anode) in a bath of proper solution the object will become plated.

In general the anode is of the same material as the metal to be deposited, and dissolving keeps up the strength of the bath. There are a great many points of technicality involved which cannot be given here. The surface of the immersed object must be conductive. If not a fine wire network stretched over it will gradually fill up in the bath and give a matrix. More generally the surface is made conductive by being brushed over with plumbago. This may be followed by a dusting of iron dust, followed by immersion in solution ot copper sulphate. This has the effect of depositing metallic copper over the surface as a starter for the final coat.

Attention must be paid to the perfect cleanliness of the objects, to the condition of the bath, purity of anodes and current density.

Voltaic batteries are largely used for the current as well as special low resistance dynamos. Thermo-electric batteries are also used to some extent but not generally.