US899062A - Process of treating and preserving metal patterns from corrosion. - Google Patents

Description

NITED STATE .FCYHARLES KIDNER. MILNE, or games, on'rsnro, CANADA. 4 .5;

PATENT o en PROCESS OF TREATING AND PREsERvIne METAL FAHTIEBNS FROM connosron.

I Specification of Letters Patent,

Batented Sept. 22, 1908.

Application filed June 22, 1903. \Serizil my. @335 ,1

' To all whom/it may concern;

Be it known that 1, CHARLES KIDNnn MILNE, a citizen of the Dominion of Canada, residing at the city of Hamilton, in the 5' county of Wentworth, in the Province of Ontario, Canada, have invented a certain new and useful Improved Art or Process of Treating and Preserving Metal Patterns from Corrosion; and I do hereby declare the following to be a full description of the same.

My invention relates to an improved art or process of treating metal patterns more particularly iron patterns used by iron founders, in such amanncr as to prevent rust from forming upon them.

llerctofore there has been much difficulty of keeping such patterns from rustin as rust renders patterns unfit to make smooth molds for casting besides causing much trouble and loss of time in trying to remedy the said evil and the-object of my improved art or process is to treat the said patterns in such a manner as to entirely and effectually prevent rust from forming upon them and prevent all loss of time and annoyance caused by rusty patterns.

In treating old iron patterns to prevent rust I first subject them to an air blast .on a wind wheel then dip the pattern in a solution of" three pints of sulfuric acid and twenty gallons of boiling water, allowing the pattern to be submerged about five minutes to start the rust. The pattern isthen dipped in a solution of boiling otash and water and allowed to stand a row minutes; it is then scoured on a No. 30 emery wheel until clear of dirt and rust. The pattern is then dipped in a solution of one quart of sulfuric acid and twenty gallons of cold water to neutralize the potash on the pattern; it is next dipped in a solution of cyanidof potassium, two ounces to one gallon of cold water, to neusulfuric acid. and cold water,

in pure'coid. water, and it is now render a condition to be submerged in a final bath as follows, t lb. 531 soda. lb. white stick potash. 6 lbs. sulfate of co per. 6 lbs. cyanid of potassium, chemical y ure. 9 gallons hot water. The above ingre rents to be mixedseparately and poured back into the solution which should testdfi hydrometer anodes, Wei-lied hot and connected to an electric dynamo. After the pattern is coated with the above solution it is heated and given a coating of hot )araflin Wax and polished with a hard brush to giveit a smooth surface which will make smoothiznolds and revent rust.

Having thus described or. process and its advantages, what I claim and desire to secure by Letters Patent, is,

The improved art or process of treating metal patterns for the prevention of rust, consisting of the treatment of the pattern, (1), to a wind blast, (2), to the action of sulfuric-acid and boiling water, (3), then in a solution'of hailing potash and water, (4) then subjected to the action of powdered emery, (5) then'subjected to the action of (6) then dip ed in a solution of cyanid of potassium an cold water, t7), then immersed and treated electrically in a solution of sal soda, white stick potash, sulfate of copper, cyanid of potassium and hot water, and afterwards given a coating of hot parafiin wax, all the ingredients 7 ed and the pattern treated in or about the proportions substantially as and for the purpose specified.

Hamilton, ()ntsrio, May, 28, 1908.

GHARLES KIDNER MILNE. Signed in the presence of- Enwann Gory, WM. Bacon;

halite the SEEMHIEG acid, next it is dipped e in my improved art