The modern electroplater; a complete book considering fully the elementary principles of electro deposition of metals, their practical application and industrial use . ing the temperature, asteam pressure adjusting valve should be inserted onthe inlet side of the steam coil. SOLUTION AGITATION During the process of plating, tiny gas bubblesform on the anodes. The effect of these bubbles isto decrease the active area of the positive plate,thereby increasing the resistance to the flow of cur-rent to the electrolyte. Unless the bubbles are re-moved by some exterior means, a more concentratedplati
The modern electroplater; a complete book considering fully the elementary principles of electro deposition of metals, their practical application and industrial use . ing the temperature, asteam pressure adjusting valve should be inserted onthe inlet side of the steam coil. SOLUTION AGITATION During the process of plating, tiny gas bubblesform on the anodes. The effect of these bubbles isto decrease the active area of the positive plate,thereby increasing the resistance to the flow of cur-rent to the electrolyte. Unless the bubbles are re-moved by some exterior means, a more concentratedplating solution must be used to counteract the detri-mental effect of the small anode area. Solution a°*i- Agitation Devices 93 tation is, therefore, often employed, with the resultthat a fine, close-grained deposit is obtained with alow current density. AGITATION WITH AIR While mechanical agitation is, perhaps, the mosteffective method available for tank work, the specialmachinery is not only expensive but it often utilizesvaluable space. On the other hand, compressed airagitation is simple and the system may be constructed iVcr/ve AirSupply ^-Insulating Coupling. Fig. 53.—Cross Section of Plating Tank, Showing Agitation of Solution by Bubbles of Compressed Air Released From Perforations in Lead Pipe Laying on Bottom of Tank and installed in a few hours time. Compressed airis available in most shops of average size, and cer-tainly if the plating room is a department of anindustrial plant. It is only necessary to drill a largenumber of small holes in a length of one-inch leadpipe, sealed at one end. This pipe is then laid alongthe center line of the bottom of the tank, as shownin Fig. 53, the free end passing up over the tank edgewhere it is connected, through an insulating joint and 94 The Modem Electroplater regulating valve, to the air supply. The tiny bubblesof escaped air pass upward through the solution,effectively agitating it. TANK RODS While installing the heating coils
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectelectro, bookyear1920
