IL30389A - Copper plating of iron and iron alloys - Google Patents

Description

Copper plating of iron and iron alloys 28666 The present invention concerns an improved process for the copperplating of iron and iron alloys the application of an electric by treatment with an acidic aqueous copper Copperplating without the application of an electric current is of particular advantage for the preparation of bodies for cold It is known that the cold working of iron and iron alloys is facilitated b applying to the body to be worked a copper It has also been known for a long time that a copper coating on iron and iron alloys can be applied by tacting the substratum with an acidic aqueous copper solution containing chloride it is difficult to prepare good adherent coatings many proposals have become known for an improvement of the means of a variety of organic In accordance with the process of German Patent Specification 714 strong organic pickling compounds are incorporated in the which pickling compounds strongly retard the dissolution of iron even in hydrochloric The patent specifies the following compounds as being for the tar bases bases extracted from animal reaction products of aldehydes reaction products of aldehydes and various amino alkaloids such as quinine and quinoidine and their sulfurated and many As particular examples there are mentioned condensation their and the Weak pickling such as for and In accordance Patent polyhydroxy hioles are used as In accordance French Patent Specification the following additives are alleged to be useful and condensation products of fatty fatty fatty amines and substituted thioureas with ethylene oxides organic reducing degradation products of salts of quaternary ammonium bases such as laurylpyridinium sulfat and British Patent Specification mentions ethoxylated aliphatic amines as particularly tageous In spite of the multiplicity of known organic lots of difficulties are encountered in in particular in the of rolled wires as well as of or drawn steel in an attempt to produce on all the materials at or near room temperature in an equal manner and adhering evenly covering copper layers of good Better results are obtained at higher temperatures of at 60 to invention concerns a process for the production of a copper coating on an iron or iron alloy body without the application of an electric by treatment an aqueous acidic solution containing copper chloride ions and at least one organic modifier being an acridine It has surprisingly been found that by using such a modifier it becomes possible to copperplate the substratum at uniform copper irrespective of the quality of the Acridine to the group of coal tar bases known to serve pickling but it was not to be expected that it assume an outstanding position compared to the remaining basic components of for the application of pyraain quinoxaline or led to the formation copper coatings of factory adherence and of partly bright and partly dark Acridine its derivatives also excel over known and agents in producing more uniform and better The substances employed in accordance with the invention are added to copperplating baths of aqueous acidic solutions containing copper and chloride Acridine may be employed in technical as well as in chemically pure Prom the group of acridine derivatives particularly good results are achieved with known under the trade name She modifiers in accordance with the invention are added to the copperplating bath in quantities of from to and may be used both in the form of bases and Larger quantities do as a rule not to additional Xt preferred to admix the additives used in accordance with t he invention to the original and salt compositions of which the copperplating bath is composed and Alternativel a separate dosing is also via a preliminary solution in The quantities of acridine its derivatives required for the of the baths are very The consumption is in the order from 2 to g of substance pro m of copperplated metal In the course of the the bath is enriched in The favourable influence of the additives employed in accordance with the invention is also manifested in cases where the iron II content is in the order of from 30 to 40 Also in this respect the process according to the invention is superior to any known used The copperplating baths are dipping at or near temperature at a temperature not exceeding Higher temperatures are possible but do not lead to any technical advantages and on the other undesired heating The duration of treatment of steel bodies which have previously been by annealings degreasing is as a rule within the range of from 1 to In this way copper coatings amounting to about 5 are By prolonging or shortening the treatment the thickness of the copper coat can be The invention is illustrated by the following Examples to which it is not 1 In a wire drawing installation qualities of rolled as well as and steel wire were freed from oxide by dipping into water addition of pickling substances The wires were then temperature into a copperplating solution containing 13 32 17 1 50 The solution was stirred by bubbling air through Thereafter the wires were rinsed with water and All wires showed a bright uniform coating of good er cold drawing of the using the usual drying agents and lubricants producing a reduction of the area of 70 to a coherent copper coating was still visible on the wire 2 The procedure was as in Example 1 replacing the ine by of The results of the ment were essentially the same as those in Example In order to prove the selective action of acridine a and its derivatives of comparative tests carried out with solutions containing of of and ml of to which and 40 of the form of were To each such solution there were added 80 of a modifier as indicated in fable The experiment was in each case carried out ith three different kinds of rolled predrawn annealed steel wire and predrawn steel The wires were first dipped for minutes and at into aqueous sulfuric acid solution containing of a commercial pickling This was then followed by rinsing with water and dipping for 15 minutes at room temperature into the stationary co er latin bath the withdrawal from the co er latin The surfaces of the wires were first evaluated as their The denomination was 1 for bright t 2 for medium and 3 for For the determination of the adherence of the coating each wire was wound about a pin having a diameter of 2 In of no peeling off of the the evaluation 1 occasional peeling off and peeling off of large pieces 3 The results are tabulated in Table Predrawn ence ance ence ance ence ance Acri 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 2 1 3 3 3 3 3 3 3 2 3 3 3 2 3 3 2 3 3 3 2 3 3 Amohib 28 2 2 3 2 2 3 3 Arquad 3 3 3 3 3 3 3 50 3 3 3 3 3 2 3 OLF 3 3 3 3 3 3 3 1 2 1 2 1 3 1 3 3 3 3 3 3 3 Ethomeen 1 1 2 2 2 2 In accordance with the indications of the the substances are described strong pickling compound for at er Eth insufficientOCRQuality

Claims (1)

1. A process the of iron and iron alloys without electric curren by with an aqueous acidic solution comprising copper chloride one ions and at le st organic modifier being acridine or an acridine A process according to Claim characterized in that the acridine derivative is A process according to Claim substantially as described and insufficientOCRQuality