3763. Nagel's Method of Electroplating with Nickel

3763.    Nagel's Method of Electroplating with Nickel. A process devised by Mr. Nagel, of Hamburg, for coating iron, steel, and other oxidizable metals with an electro deposit of nickel or cobalt, consists in taking 4 parts, by weight, of pure sulphate of the protoxide of nickel by crystallization, and 2 parts, by weight, of pure ammonia, so as to form a double salt, which is then dissolved in GO parts of distilled water, and 12 parts of ammoniacal solution of the specific gravity of .909 added. The electro deposit is effected by an ordinary galvanic current, using a platinum positive pole, the solution being heated to about lOOo Fahr. The strength of the galvanic current is regulated according to the number of objects to be coated.

3764. To Protect Steel from Rusting

3764.   To Protect Steel from Rusting. It has been found by experiment that an electro-deposited coating of nickel protects the surface of polished steel completely from rust. Swords, knives, and other articles of steel liable to exposure, may be coated with nickel without materially altering the color of the metal.

3765. To Protect Copper and Brass

3765.    To Protect Copper and Brass. Copper and brass are equally well protected by nickel (see No. 3764 (To Protect Steel from Rusting)), but, of course, with change of color on the surface. The nickel 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

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 G9 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 (Nagel's Method of Electroplating with Nickel).)

3767. To Electroplate with Silicium

3767.    To Electroplate with Silicium. In the following manner, a coating of silicium can be obtained direct from silica: Take the following proportions: 3/4 ounce, by measure, of hydrofluoric acid, 1/4 ounce hydrochloric acid, and 40 or 50 grains either of precipitated silica, or of fine white sand (the former dissolves most freely), and boil the whole together for a few minutes, until no more silica is dissolved. Use this solution exactly in the same manner as the clay solution (see No. 3767 (To Electroplate with Silicium)), and a fine white deposit of metallic silicium will be obtained, provided that the size of the article is adapted to the quantity of the electric current. Common red sand, or, indeed, any kind of silicious stone, finely powdered, may be used in place of the white sand, and with equal success, if it be previously boiled in hydrochloric acid, to remove the red oxide of iron or other impurities. In depositing both aluminum and silicium, it is necessary to well saturate the acid with the solid ingredients by boiling, otherwise very little deposit of metal will be obtained.