US1254264A

US1254264A - Process for rust-proofing iron and steel.

Info

Publication number: US1254264A
Application number: US15001617A
Authority: US
Inventors: Walter I Oeschger
Original assignee: PARKER RUST PROOF Co OF AMERICA
Current assignee: PARKER RUST PROOF Co OF AMERICA
Priority date: 1917-02-21
Filing date: 1917-02-21
Publication date: 1918-01-22
Anticipated expiration: 1935-01-22

Description

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WAIJTER I. OESCHGER, OF DETROIT, MICHIGAN, ASSIGNOR T PARKER RUST PROOF COMPANY OF AMERICA, 0F DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

PROCESS FOR RUST-PROOFING IRON AND STEEL.

To all whom it may concern."

Be it known that. I, ,WALTER I. Onscnqnn, a. citizen of the United States and residing at Detroit, in the county of Wayne and State of Michigan, have invented a new and Improved Process for Rust-Proofing Iron and Steel, of which the following 1s a specification. Y

This invention relates to a process for forming rust-proof surfaces on articles of iron and steel or alloysthereof, and its ob ject is to provide a process whereby the articles to be treated are subjected to fumes or Vapors which produce surfaces of basic ferro-ferric phosphates of iron which are heavy and very dense.

This invention consists in subjecting the surfaces of the articles of iron and steel to be treated to fumes or vapors produced by highly heating metallic phosphates such as the acid meta-phosphates of tungsten, molybdenum or of any of the metals of the third, fourth and fifth groups, according to the analytical classification (set forth by Prof. G. S. Newth, T. (3., F. G. 8., in the eighth edition of his Manual of 07101126- cal Analysis, published by Longmans, Green & Co, New York, in 1909), either singly or in combination with each other.

In this classification, tungsten is in the first group, molybdenum in the second group, while the third, fourth and fifth groups include aluminum, chromium, co balt, iron, nickel, manganese, zinc, barium, strontium, calcium. sodium, potassium, magnesium and vanadium.

The acid meta-phosphate of most general application is made by placing a quantity of iron oxid, preferably powdered black iron scale, (Fe,0 in a pot with suflieient phosphoric acid to form a soft paste. A quantity of Water about equal in amount to the acid may be added to keep the mass from caking, after which heat is applied and the material is stirred until a dry granular mass is obtained, which is then'powdered. The

Specification of Letters Patent.

Patented Jan. 22, 193%..

Application filed February 21, 1917. Serial No. 150,016..

The reactions may be expressed as follows: When heated Fe,o,+sumo;erero emrogamo.

And continued heating results in driving of the water of combination zrero en ro 2Fe(PO ,2HPO +8H,0.

This is an acid meta-phosphate.

Carbonates and oxids of theother metals may be similarly treated. Care must be taken to avoid heating these phosphates to a point where there is more than merely perceptible fuming.

- The articles to be treated are preferably previously heated ,to about 600 degrees F. in order to obtain the best results. While cold metal may be treated with satisfactory final results by this process, the time required is very great. When heated to the temperature indicated, the articles can be rendered rust-proof in from ten .to forty minutes. The articles may be treated in the furnace wherein they are heated or they may be placed in a special treating chamber.

The acid meta-phosphates are heated to a high temperature to produce abundant fumes which are acid in. character. This may be done in the treating chamber or in an especially constructed furnace, the fumes being drawn into the treating chamber by means of a suction fan placed where most eflcctive. If desired, a jet of dry steam may be caused to enter the treating chamber to render the fumes more active in character. The duration of the treatment will depend upon the character of the metals treated and also upon the desired character of the coating.

It has been found that the mixing of about two per cent. of the acid metaphosphates of molybdenum, strontium or ed to receive paint, enamel, lacquer and even other metals by electro-plating.

Volatile metals such as zinc may be mixed with the acid meta-phosphates during the time they are heated to produce the fumes,

and the action thereof seems to be the production of more even and dense surfaces having high resistance to the corroding effects of the elements in the atmosphere.

The combination of molybdenum, tungsten or any of the metals of the third,'fourth and fifth groups as stated above, with an excess of meta-phosphoric acid to form a paste is temporary and maybe partly broken up at any time by the application of heat. These metals all have the characteristic offreely entering into this combination. The fumes are produced by the decomposition of these acid salts, and are delivered more regularly than if the metaphosphoric acid is heated alone, probably owing'to the mechanical carrying over of small particles of acid when the liquid boils.

I claim 1. A new and useful processconsisting in subjecting articles of iron and steel to the action of fumes from acid meta-phosphates of tungsten, molybdenum or of any of the metals of the third, fourth and fifth groups, singly or in combination with each other.

2. A new and useful process consisting in subjecting articles of iron and steel to the action of steam mixed with the fumes from acid meta-phosphates of tungsten molybdenum or of any of the metals of the tlnrd, fourth and fifth grou s.

3. A new and usefu process consisting in subjecting heated articles of iron and steelto the action of fumes caused by heating acid meta-phosphates of tungsten molybdenum or of any of the metals of e third,

fourth and fifth groups.

, .4. A new and useful process consisting in meta-phosphates of iron mixed with a small percentage of acid meta-phosphate of molybdenum, strontium or tungsten. I

' 7 A newand useful process consisting in subjecting heated articles of iron and steel to the action of fumes roduced by heating acid meta-phosphates 0 iron to wlnch fumes a quantity of steam has been added.

8. A new and useful process consistingin subjecting articles of iron'and steel to the action of fumes produced by heating acid meta-phosphates of iron, to which fumes a quantity of steam has been added.

9. A new and useful process consisting in subjecting articles of iron and steel to the action of fumes produced byheating acid meta-phosphates of iron and a. volatile metal.

10. A new and useful process consisting in subjectin articles of iron and steel to the action 0 fumes produced by heating acid meta-phosphates of iron and zinc.

WALTER I. OESCHGER.