NONPOWER SOURCE PLATING METHOD UTILIZING POTENTIAL DIFFERENCE DUE TO EARTHING

摘要

PURPOSE:To apply the titled plating with excellent antirust property at a low cost by a method wherein, among two or more kinds of metals, a metal high in ionization tendency is inserted into a plating bath in an earthed condition and a metal low in ionization tendency is suspended into the plating bath. CONSTITUTION:In a plating bath tank 5, a metal 1 high in ionization tendency and a plating bath liquid 8 containing a same kind of ion are entered. The metal 1 earthed to a position 7 by connecting to a lead wire 6 is immersed in said liquid 8. A metal 2 low in ionization tendency is suspended from a support rod 4 by hooking to a hanger 3 made of aluminum or a resin to be immersed in said liquid 8. Further, a metal same to the metal 1 is immersed in said liquid 8 without earthing. This metal is reacted with the liquid 8 to generate hydrogen and, by a gas bubble stream 8' of said hydrogen, electric double layer on a surface of the metals 1, 2 is removed.