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United States Patent Office Fatented Nov 2,812,299 United States Patent Office fatented Nov. 5, 1957 1 2 all of the above enumerated disadvantages of the known 2,812,299 art. ELECTROLYTIC DEPOSITION OF GOLD AND It is yet a further object of the present invention to GOLD ALLOYS provide for the formation of relatively thick layers of gold ... 5 or gold alloys of, for example, 20 or more microns in a Fritz Volk, Pforzheim, Germany, assignor to Birle & Co. single operation. K. G. Pforzheim, Germany Other objects and advantages of the present invention No Drawing Application May 23, 1955, will be apparent from a further reading of the specifica Serial No. 510,513 tion and of the appended claims. In Germany May 5, 1949 0. With the above objects in view, the present invention mainly comprises a bath from which gold may be electro Public Law 619, August 23, 1954 lytically deposited, the bath essentially consisting of an Patent expires May 5, 1969 aqueous solution of an alkali metal-gold-cyanide complex 16 Claims. (C. 204-43) and at least one buffer substance adapted to maintain a maximum pH of 7.5 in the solution during deposition of The present invention relates to the electrolytic depo the gold from the solution. Preferably, the buffer uti sition of gold and more particularly to the electrolytic lized is such as to maintain the pH at between 6.5 and 7.5 deposition of gold and gold alloys from solutions con during the electrolytic deposition of the gold from the taining the same. solution. The known methods of depositing more or less heavy 20 Most preferably, the alkali metal-gold-cyanide complex gold or gold alloy layers on metallic or metallized sur is potassium gold cyanide (KAu(CN)2), although other faces utilize gold baths, which, during the running of the alkali metal-gold-cyanides such as sodium gold cyanide process and the depositing of the gold from the bath, give may also be used. an alkali reaction. Besides the gold salt which is an The maintaining of the pH value of the bath during alkali metal-gold-cyanide complex and is most usually 25 the electrolytic deposition of the gold therefrom at a max potassium gold cyanide, the usual baths contain strongly imum value of 7.5 is most preferably accomplished by alkaline reacting additives such as potassium or sodium incorporating a primary phosphate and more particularly cyanide, possibly even potassium hydroxide and potas an alkali metal, alkaline earth metal or ammonium pri sium carbonate or sodium carbonate and nearly always mary phosphate in the aqueous solution. One or more disodium phosphate which has an alkaline reaction due 30 alkali metal primary phosphate such as monosodium to the hydrolytic splitting thereof. In addition, the known phosphate or monopotassium phosphate may be utilized, gold baths which contain potassium ferrocyanide contain or mono-ammonium phosphate, or one or more alkaline as the conducting salt the alkaline-reacting sodium car earth metal primary phosphate such as Ca(H2PO4)2 may bonate. be utilized. It is also possible to utilize a mixture of one The gold baths of the prior art all have the disadvan or more alkali metal primary phosphate and ammonium tage that upon longer plating time the operation is not primary phosphate, or ammonium primary phosphate and "scum-free,” and therefore in the event that a heavy plat one or more alkaline earth metal primary phosphate, or ing is desired, often an intermediate treatment of the one or more alkali metal primary phosphate and one or object to be plated by brushing, scraping or the like is more alkaline earth metal primary phosphate, or one or necessary since a loose coating forms upon the surface 40 more alkali metal primary phosphate and ammonium pri of the object to be plated, which loose coating acts as a mary phosphate and one or more alkaline earth metal blocking layer against the metal or metals to be plated primary phosphate. Any mixture of this type may be on the base material. utilized to achieve the buffering of the aqueous solution This intermediate treatment is of course extremely dis at a maximum pH of 7.5 during the deposition of the gold advantageous since it results in a loss of time and material. 45 from the solution. Other similar acid salts or mixtures of Attempts have been made where it is desired to obtain acid salts may be utilized in place of the primary phos a strong gold plating, to limit to a minimum the amount phates mentioned above. of free potassium cyanide in the solution from the begin The present invention is applicable not only to the depo ning, that is, before starting the electrolytic deposition, sition of pure gold from solutions, but also to the deposi however, the alkali fluid by the electrochemical reaction 5 () tion of gold along with one or more alloying metals for still had a harmful effect. the hardening or coloring of the gold along with the gold It is therefore a primary object of the present inven from the solution. Any of the usual alloying metal salts tion to provide for solution from which gold may be elec may therefore be continued in the baths in accordance trolytically deposited in which the harmful effect of the with the present invention. For example, such com alkali which is set free during the electrochemical reac- 5 pounds as the water soluble complexes of cyanides of sil tion of deposition of the gold from the solution is rendered ver, copper, nickel, iron and/or cobalt may be continued harmless. in the bath. These complexes are generally complexes of It is another object of the present invention to provide an alkali metal or ammonium, the metal to be alloyed for the electrolytic deposition of gold in which the object and the cyanide ion. to be plated remains scum-free during the electrolytic The maintaining of the pH at a maximum of 7.5 during deposition and in which in fact there is no scum formation. the electrolytic deposition of the gold from the solution It is still another object of the present invention to pro may be accomplished by the incorporation of one or vide a method of electrolytically depositing gold on ob more of the above primary phosphate as buffer substances jects to be plated therewith whereby there is no scum 65 in the solution, or the desired primary phosphate may formation, so that the electrolytic deposition proceeds be formed during the deposition process, this being quickly and without any intermediate treatments even achieved by the incorporation of one or more secondary when forming relatively thick layers. phosphate in the utilized bath and the addition of dilute It is a further object of the present invention to pro orthophosphoric acid before and during the electrolytic vide baths from which gold may be electrolytically de 70 deposition until a neutral or acid reaction is obtained. posited, which baths may be utilized for the deposition of The orthophosphoric acid converts the secondary phos gold during relatively long time periods while avoiding :- phate to the primary phosphate which buffers the solu 2,812,299 3 4 . -- tion during the deposition of the gold therefrom so that Example 3 the pH does not exceed 7.5. The buffering effect of the primary phosphate prevents Into an amount of water sufficient to form a 1 liter solu the deleterious influence of the formed alkalies during tion is dissolved: prolonged plating times whereby in accordance with the 5 g. of pure gold in the form of potassium gold (I) present invention a practically homogeneous bath reaction cyanide, is achieved even upon prolonged plating of objects with 16 g. of primary-ammonium phosphate the electrolytic baths of the present invention. An addi (18 g. of secondary-ammonium phosphate) and tional advantage of the present invention is that the 0.75g. of nickel in the form of sodium nickel (II) evolvement of harmful and odiferous gases is prevented. 10 tetracyanide. Still further, the present invention has the advantage of Example 4 considerably shortening the required plating times as compared to the known baths and methods of plating Into an amount of water sufficient to form a 1 liter therewith. solution is dissolved: The operation of the electrolytic deposition can be 7 g. of pure gold in the form of sodium gold (I) cyanide, carried out with insoluble anodes, and the gold and the 25 g. of primary sodium phosphate, necessary alloying components can be regularly replen (28 g. of secondary sodium phosphate) ished as the same are used up from the original solution. 3 g. of iron in the form of sodium iron (II) cyanide, and It is thus possible, for example, utilizing a 20 liter bath 2 g. of copper in the form of sodium copper (I) tetra which originally contained 80 g. of pure gold to plate 20 cyanide. 400 g. of gold therefrom, fresh gold salt being added as the gold is deposited from the solution, before a new Example 5 bath must be utilized. The following are examples of Into an amount of water sufficient to form a 1 liter solu bath compositions in accordance with the present in tion is dissolved: vention, the scope of the invention not however, being 6 g. of pure gold in the form of potassium gold (I) cyanide, limited to the specific details of the examples. Each ex 10 g. of primary sodium phosphate, ample contains a primary phosphate and-put in brack 5 g. of primary-ammonium phosphate, ets-a secondary phosphate. The addition of a secondary phosphate is necessary only in view of the impure gold (18 g.
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