US622732A - Process of coating one metal with another - Google Patents

Description

salient HEMAN TnUns'ron, or none cannon, Nnnfsnnsnvil rRocEss or comma earners. was ANOTHER, ac.

srncrrrcn'rron' fog of, Letters Patent no. scares, dated n rn 11,1eea.

'llpplicatlon filed July 2, 1898- fierlal No. 685.073, e spec m s- To all whom it may concern: lie itlrnovvn that l, SAMUEL Harms THURS- rot a citizen of the United States of America. residing at Long Branchponnty of Monmouth, E 5 State of New Jersey, have invented and made a certain new process for coating one metal with another, such as ironand steel with cop- .4 per, and a new product as the result of such process; and I do hereby declare that the folto lowing is a full, clear, and exact description and specification oi the same.

My invention relates to the coating of metals in general with another metal of a softer nature in order to protect it from oxidation,

r 5 and, specifically, to coating" iron and steel with copper hint or pelnicle, and to the furnishing of a product having" a surface coating practically permanent in its nature in regard to its appearance and power of resisting changes from contact with the atmosphere; and it consists in a certain method of procedure fully set forth in this specification and claimed at the end thereof. a I in order that persons skilled in the art to which my invention appertains may understand, perform, and use my inventiornl will proceed to describe it. is

i am aware that it is old in the art to coat one metal with another for various purposes by electrical'process, by dipping in molten metal, by dipping in hot solution, by rolling two metals together after soldering them, and by rnhhing an alloy of metal on iron to give color; but I am not aware that one metal has ever before my invention been permanently secured to another metal by rneans of the proc css I am about to descrihemorhas any pl ednct ever been known in any way similar to the product which is furnished by the practice of an my invention or process or ever produced by any other means,whether by my process or not. My invention is confined to coating iron and its derivativesvvith a film of copper oxidil shall in this present specification partieslarly-so describe the steps necessary for this] purpose. V-

Having thoroughly cleaned thesnrfaces of the iron tolbe coatcdby'cleaning I mean purifying the surfaces from matter which prevents cohhsionof the coating metal with the molecules of the iron--I rub the said surfaces with copper until a thin coherent film f and to coherevvith then].

film to a heat sufficient to turn the said film to a deep blne-hlack,-and leave on the iron a thin skin of hlack oxid of copper or cupric .oxid, which adheres so tenaciously to the iron ;as to practically'forin a part of the iron itself. ll sometimes heat the iron before coating it may be applied in the manner heretofore deadheres tothe iron, This may best he done by light frictional impact oft repented, as

with revolving copper hrnshes, which causes 55 the copper to impinge or beimpacted against the iron molecules and into the interstices X I then preferably heatthe iron provided with thesaid copper 6 Q to drive ed any'inoistnre there rnighthe present. .The cnpric oxid formed is very dense; and quite black and serves as a perfect protection for the iron against the atmospheric attacks. It is to he here stated that the copper 'filni- "will adhere to the iron and protect its surfaces, even if it is not changed to a] black cnpricoxid, and for some especial purposes I propose to stop myprocess at this point. This copper filin adheres so tenaciously to the iron as to resist removal by bending, rolling, or hammering, and can only he filed oft orremovedhy'abrasion- Coat after coat scribed nntila thickness is attained suitable for the uses to Whichthe product is to be put. This is particularly true when the cnpric oxid is formed from the film, and a copper film may he formed over the cupric-oxid filrn'and not again heated to form another coating of cupric oxid; but I prefer for most purposes to carrytmy process to its full limit and leave a film of cupric black anhydrous oxid of copper on the iron of such thickness as will he .suflicient'for the special purposes needed.

. lam aware of the United States patents to Bower, January 2, 1883, and Spring, N ovemher 27, 1877; of English patents to Dowling', 1839,

.,No.'7,949, and to Barron, May 24,1855, No. 1,243, and I do not claim anything set out in said patents. By exhaustive experiments I have determined that the oxids of copperwill not stick to copper, astheir coemcient of expansion is difierent from the coeflicient of expansion of copper, while the coeficient of expansion of copperoxid" and that of iron cor-. respond closely-enough to prevent scaling oil. I have applied copperih a comminutedform;

'but I prefer to comminnte it by rubbing it on 5 what I claim as new and as my invention, and

desire to secure by Letters Patent, is-

"' '1. The within-described process of coating 'iron and steel with copper oxid, which con- Y sists in first oleaningthe iron to be coated and IO then causing either metal to impinge upon the other metal until a film of copper is impncted upon the iron to be coated, and then heating the said film to the desired tempereture to form cupric oxid, snbstantiallyas end for the purposes hereinbefore specified.

2. The within-described product consisting of iron or steel covered with an adherentcoating of oxid of copper, substantially such as hereinbefore specified.

SAMUEL HEMAN 'rnunsrom Witnesses:

.Lmns M. HICKS, .CnARLEs W. Low.