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To Coat Iron with Zinc

In requires rather a thick deposit to protect covering iron with zinc, the precautions ne- metals from the action of acids, which is, cessary for copper are not required; zinc being probably, the only use it can be applied to. the positive metal, acids have a stronger 3762. Electroplating with Nickel. affinity for it than for iron, and therefore an acid solution may be used. The solution generally used is the sulphate, used in the same way as sulphate of copper. (See No. 3661.) to precipitate the metal; after which the pre- Nickel is very easily deposited, and may be prepared for this purpose by dissolving it in nitric acid; then adding cyanide of potassium cipitate is washed and dissolved by the ad- solved. Use this solution exactly in the same dition of more cyanide of potassium. Or the manner as the clay solution (see No. 3767), nitrate solution may be precipitated by carbonate of potash; this should be well washed, and then dissolved in cyanide of potassium; a proportion of carbonate of potash will be in the solution, which has not been found to be metal is very easily deposited; it yields a color approaching to silver, which is not liable to tarnish on exposure to the air. A coating of this metal would be very useful for covering common work, such other gas-fittings, and even common plate. common plate. The great difficulty experiobtain a positive electrode: the metal is very difficult to fuse, and so brittle that we have never been able to obtain either a plate or a sheet of it. Could this difficulty be easily overcome , the application of nickel to the coating of other metals would be exproperty of not being liable to tarnish would make it eminently useful for all general purposes. 3763. Nagel's Method of Electroplating with Nickel. A process devised by Mr. with Nickel.

A process devised by Mr.

Nagel, of Hamburg , for coating iron, steel, and other oxidizable metals with an electro deposit or nickel or cobalt, consists in taking 4 parts, b 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 60 parts of distilled water, and 12 parts of amion of the specific gravity of .909 added. The electro deposit is effected galvanic current, using a platinum positive pole, the solution being heated to about 100° Fahr. The strength of the galvanic current is regulated according to the number of objects to be coated. 3764. Το Prouct Steel from Rusting.

It has been found by experiment that an elechas been found by experiment that an electro-deposited coating of nickel protects the surface of polished steel completely from rust. , and other articles of steel liable to exposure , may be coated with nickel without materially altering the color of the metal. 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 ingre dients by boiling , otherwise very little deposit of metal will be obtained.

For each gallon of water used to make the so-