US881221A - Rust-proofing iron, steel, &c. - Google Patents

Description

No. 881,221. PATENTED MAR, 10, 1908.

A. 'BONTEMPI. v RUST PROOPING' IRON, STEEL, 6w.

APPLICATION IILED JAIL 29, 1907. RENEWED (AN. 28, 1908.

INVENTOR v by "If/111: 5, i aw mw LM WITNESSES:

UNITED AUGUSTO BONTEMPI, or NEW YORK, N. r.

RUST-PROOFING IRON, STEEL, 800.

Specification of Letters Patent.

Patented March 10, 1908.

Application filed January 29, 1907, Serial No. 354,672. Renewed January 28, 1908. Seral No. 412,991.

To all whom it may concern:

.Be it known that I, AUcUs'ro BONTEMPI, a subject of the King of Italy, residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Rust-Proofmg Iron, Steel, or the Like, of which the following is a specification.

' The object of the invention is to produce a surface which prevents rusting even under severe conditions such as subjection to high temperature and corrosive influence, water, salt water, etc. 7 j

The invention provides certain improvements over the method described in my prior application No. 285,240 dated October 31, 1905 and adapted also for use in connection with the process of said application.

The desired effect is obtained by heating the iron to approximately from 1000 degrees F. to 1800 degrees F. in a closed and preferably airtight chamber, the iron having een previously treated according to the 'Bower-Barff process or not asdesired, and

subjecting it to the gas or vapor of one or more non-corrodible substances. Where the BowerBarff treatment is omitted the temperature need .be only high enough'to insure volatilization of the non corrodible sub stance. For example for zinc, lead and other volatile non-corrodible metals the temperature will generally be within 1000 degrees F.

At the time of applying the gases the metal under treatment will be very much expanded by the heat and the pores, especially those at the surface will be opened to receive the gases which will penetrate to a considerable de th depending upon the period of time and ot or conditions. When the metal cools after the treatment, the vapors are first reduced to a solid condition, and by the further cooling of the metal a very dense and substantiallynon-corrodible surface is produced.

Wherever heavy goods are being treated they will usually be subjected to the Bower- Barfi process first. But for light flexible goods the Bower-Barfi process may be omitted, the resulting coating being less, brittle by reason of the omission.

Where the goods are first subjected to steam according to the Bower-Barri process, lime :or some equivalent alkaline material may be introduced serving to insure a perfect dryness ,of the steam and-particularly also facilitating the formation of the coating by a catalytic action. I may also inject with the steam a small quantity of naphtha or other hydrocarbon which gives a desirable black color to the coating.

The goods under treatment are preferably carried in a closed metal chamber with a surrounding chamber of firc brick. here the goods are not intended for the hardest use, however, the goods need not be carried in a perfectly airtight chamber but may be in an o wen pan within the chamber of fire brick whic l is comparatively tight.-

A suitable apparatus for carrying out the process is illustrated diagrammatically in the drawings.

Referring to the drawings, A is the boiler furnishing the desired steam, which passes by a pipe to a coil C running back and therefore in the chamber D of fire brick and arranged on three sides of the sheet iron or steel mufller orchamber E in which the goods to be treated, such as the ipe F, are carried. A fire box G is arranged slow the chamber D, the products of combustion being carried by any suitable arrangement of fines about A tray of lime H may be introduced into i the muflier before the latter is closed and heated. A branch J permits the injection of naphtha into the steam. p

Any suitable means such as' the pipe K may be used for introducing the non-corro dible materials after the goods are heated to the desired high temperature.

Where treatment by steam is not to be used in any particular case, of course, it will not be necessary to use anythingmore than the mufller with means for heating it and for introducing the non-corrodible materials. Supposing, however, that the process is to comprise all the various steps'described, the operation is -as follows :The goods are filled into the mufller which is placed in the fire brick chamber and the latter substantially sealed after making the several connections. The muflier and contents are heated to from 1000 to 1800 degrees Fahrenheit a proximately and then the steam from theoiler A isintroduced and the rocess continued until the usual black-oxid s produced to the desired depth. Thereu on, While maintaining the temperature of't e muffler, the steam is ,cut off and the non-corrodible material mtroduced.

As examples offthe non-corrodible mateand then with the hydrocarbon. 2O

\ tic-ularity of detail certain specific embodirial, I may use (1) tannic acid, an oleaginous I material, and a non-corrodible metal such as zinc or an oxid of such metal; or (2) a pure 5 metal such as zinc or lead; or (3) substantially solid hydrocarbons such as coal tar or pitch. The first of these compositions gives a good coating of dark gray color, the second gives also a good coating of blue color, but the third gives a black coating of the very 5 highest quality. I have tested goods made with this black coating under all known con- 1 ditions for rusting and have found them to f be perlectlv rust proof under all tests.

()f the three non-corrodible materials above described the best results are obtained by treatment first with the non-corrodible metal (either alone or in the combination with tannic acid and oleaginous material) The process will be continued from 2- to 6 hours according to the depth of treatment desired and the weight of the goods, having regard to the weakening of the fiber which might be serious in light goods.

Before the treatment the metal is washed perfectly clean as usual in rust proofing processes. After the goods are taken out of the retort they are cooled to about 100 degrees F. and greased with Vaseline and cleaned so as to give them a good polish and of attractive appearance.

Although I have described with great parments of my invention, yet it is not to be understood therefrom that the invention is restricted to the particular embodiments disclosed, as various modifications thereof in detail may be made by those skilled in the art' without departure from the invention.

What I claim is:

1. The method of protecting iron or steel which consists in sub ecting it to the Bower- Bartf treatment and subsequently subjecting it to the vapor or gas of a non-corrodible metal substance while heating it to a high temperature in a closed chamber.

2. The method of protecting iron or steel which consists in subjecting it to the Bower- Barl'l treatment, and then subjecting it to the vapor or gas of a non-corrodible metal substance wlule heated in a closed chamber,

3 and finally subjecting it to the vapor or gas ola hydrocarbon while heated in a c osed chamber, the temperatures in such closed chambers being in each case suliiciently high to form the vapor or gas referred to.

3. The method of )rotecting iron or steel which consists in su jecting it in a closed chamber at a temperature sullicient to form such a vapor or gas, to the vapor or gas of a composition including tannic acid, an oleaginous material, and an oxid of a non-corrodible metal.

4. The method of )rotecting iron or steel which consists in subjecting it in a closed chamber at a temperature suflicient to form such a vapor or gas, to the vapor or gas of a composition including tannic acid, an oleaginous material, and an oXid of a non-corrodible metal, and following this by similar treat ment with a solid hydrocarbon.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

AUGUSTO BONTEMPI. Witnesses:

DOMINGO A.Us1NA, FRED WHITE

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