Important: Safety Warning
This page contains a formula or preparation using substances now known to be dangerously toxic, such as arsenic, mercury, lead, or cyanide compounds. Exposure to these substances can cause severe poisoning, permanent injury, or death.
In addition, this page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
This information has been left in for historical purposes but should not be acted upon.
Home › Electroplating With Various Metals › To Protect Copper and Brass
To Protect Copper and Brass
Copper and brass are equally well protected tained. Should the copper have a tendency by nickel (see No. 3764), but, of course, with to come down in a greater proportion than is change of color on the surface. The nickel desired, which may be known by the deposit facing, when burnished, has a whiter color than polished steel , but not as white as silver, being nearer in appearance to platinum.. 3766. Nagel's Method of Electroplating Metal with Cobalt. For coating with cobalt, 138 parts, by weight, of pure sulphate of cobalt, are combined with 69 parts of pure ammonia, to form a double salt, which is then dissolved in 1000 parts of distilled water, and 120 parts of ammoniacal solution, of the same specific gravity as before, are added. The process of deposition with cobalt is the same as with nickel. (See No. 3763.) assuming too red an appearance, it is corrected by the addition of carbonate of ammonia, solution is heated. Should the zinc have a or by a reduction of temperature, when the tendency to come down in too great a proportion, which may be seen by the deposit being too pale in its appearance, this is corrected by the addition of cyanide of potassium or by an increase of temperature.
Silver. The alloy, German silver, is deposit- 3770. To Electroplate with German ed by means of a solution consisting of car-