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UNITED STATES PATENT OFFICE 2,496,845 BATH for BRASS IMMERSON COATING on ALUMNUMAND ALUMNUMALLOY Alvin R

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UNITED STATES PATENT OFFICE 2,496,845 BATH for BRASS IMMERSON COATING on ALUMNUMAND ALUMNUMALLOY Alvin R Patented Feb. 7, 1950 2,496,845 UNITED STATES PATENT OFFICE 2,496,845 BATH FOR BRASS IMMERSON COATING ON ALUMNUMAND ALUMNUMALLOY Alvin R. Balden, Plymouth, and Leland M. Morse, Pontiac, Mich., assignors to Chrysler Corpora tion, Highland Park, Mich., a corporation of Delaware No Drawing. Application June 10, 1946, Serial No. 675,826 8 Claims. (C. 06-1) 1. 2 This invention relates to an improved immer being Na2ZnO2 in the presence of an excess of sion deposition particularly for aluminum and NaOH. Solution of the foregoing ingredient in aluminum alloys. a relatively small amount of water in the order More specifically, the invention pertains to an of 10% to 25% of the volume of the final bath improved brass immersion deposition of this kind. s avoids precipitation of zinc hydroxide from the One of the main objects of the invention is to Solution. provide an immersion bath by which coatings of A Solution of approximately 3.17 ounces of sodi brass having improved bearing properties can be um cyanide in Substantially one pint of water readily formed on aluminum and aluminum alloy is then prepared and to it is slowly added during SurfaceS. O stirring approximately 1.75 ounces of cuprous Another object of the invention is to provide a, cyanide Cu2 (CN)2. The resulting sodium copper bath of this character from which coatings of cyanide (Na2Cu (CN)3) is then mixed with the brass may be deposited on and integrally bonded above mentioned solution of sodium zincate and to surfaces comprising aluminum and aluminum Sodium hydroxide (Na2ZnO2--NaOH) and sufi alloys. 5 cient Water is added during constant stirring to A further object of the invention is to provide make the total solution up to one gallon. a brass immersion bath of this kind Which is To one-half pint of the last mentioned solution conveniently controllable to predetermine the is added .014 ounces of basic lead carbonate. color and character of the deposit formed thereby. Any lead salt which is soluble in caustic solution, We have found that the presence of critical 20 Such as lead oxide, lead acetate or lead hydroxide amounts of lead salts in brass immersion coating can be used in its molecular equivalent in place baths from which brass is deposited by chemical of basic lead carbonate and combinations of such displacement produces coatings on aluminum and soluble lead compounds may also be used. This aluminum alloy surfaces which are extremely ad lead Salt containing solution is then introduced herent to such surfaces and have excellent bear 2 5 into the previously formed sodium zincate-sodium ing properties. It has also been found that the hydroxide and sodium copper cyanide solution to appearance of the resulting coatings can be con form the finished immersion bath. The lead salt trolled within ranges of color varying from pink is dissolved in the diluted bath solution in order through yellow, to green, by suitable control of to avoid reducing its solubility in the concen the lead salt content of the bath. The thickness fy trated solution. - characteristics of the resulting deposit can corre The foregoing bath is particularly compounded spondingly be controlled by the lead salt content to produce on high alloy content aluminum alloys, of the bath. When the lead salt content is such brass immersion coatings of generally yellow col as to produce a pink deposit, the coating can be oration having desirable bearing properties. In built upon aluminum and aluminum alloy Sur- :3. 5 this bath, a coating of approximately .0001 inch to faces, to a greater thickness than those of yellow .00015 inch thickness is produced on such alumi and green deposits, the yellow deposit being capa num alloys by an immersion time of about five be of being built up to a greater thickness than minutes. A coating formed by this bath has been the green. found to be particularly suitable for pistons hav A brass coating bath embodying the invention 40 ing the following composition: copper 6.25% to may be made as follows, the quantities of mate 7.75%, silicon 5% to 6%, magnesium.15% to rials specified being in amounts sufficient to pro .40%, iron 1.5% maximum, impurities including duce One gallon of the finished bath. Approxi Zinc .75% maximum, and the remainder alu mately 30 ounces of a composition commercially minum. known as “Wyandotte ZA-30' manufactured by 4 The above bath is thus compounded from in Wyandotte Chemical Company of Wyandotte, gredients comprising 15.8 oz. per gallon sodium Michigan, are dissolved in approximately one pint Zincate, 16.2 oz. per gallon of sodium hydroxide, of Water. This composition comprises the re 1.75 oz. per gallon of copper cyanide, 3.17 oz. per action product of substantially 30% zinc oxide gallon of sodium cyanide and .014 oz. per gallon of and 54% sodium hydroxide, the reaction product 50 basic lead carbonate. For coating alloys of the 2,496,845 3 4. above specified type the formula may vary as of the solution as the purity of aluminum in the follows: alloy being coated increases. Likewise, as the Eacample I aluminum content of the alloy increases the so dium zincate and Sodium hydroxide content of Sodium zincate-from 13 oz. to 16 oz. per gallon 5 the bath should also be increased in Order to Sodium hydroxide-from 13 Oz. to 20 OZ. per obtain optimum results. gallon Quantities of lead salts referred to herein are Copper cyanide-from i.5 oz. to 2 oz. per gallon inclusive of lead salt impurities and such impuri Sodium cyanide-from 2.75 oz. to 3.5 OZ. per ties should be taken account of in compounding gallon 0 the Solution. Basic lead carbonate or equivalent-from .01 OZ. Articles to be coated by immersion are prefer to .03 oz. per gallon. ably cleaned in one of two ways. In the coating Variation of the lead content of the above de of mechanical parts in which adhesion is more scribed bath composition has the following effect important than appearance, an etching type upon color and thickness characteristics. When 5 cleaner is preferably employed, such as an eque the lead metal content is between .003 oz. per gal ous sodium hydroxide solution. Where it is de lon and .016 oz. per gallon, the deposit is yellow in sired to retain the bright finish of a part, a non color and has a maximum thickness of .00015 inch etching type cleaner containing sodium carbonate which will be formed in an immersion time of and sodium silicate, for example, is employed. about five minutes at about 115° F. When the 20 When an etching type cleaner is used on alumi lead metal content is above .016 oz. per gallon, num containing copper and/or silicon, the clean the deposit is green in color and has a maximum ing operation should be followed by treatment in thickness of .0001 inch which will be formed in an acid dip containing nitric and hydrofluoric an immersion time of about five minutes at 115 acids in order to remove the resulting Smut. F. With a lead content below .003 oz. per gallon After the brass immersion deposition has been the deposit tends to be pink and attains a thick formed, the coated part is momentarily immersed ness of about .0002 inch in approximately five in a dilute nitric acid solution, about one-half minutes at 115° F. This latter deposit does not of one per cent by volume, and then washed in as strongly adhere to the aluminum alloys as the water. The dilute nitric acid treatment preserves above mentioned yellow and green depositS. 30 the color of the immersion deposition. While the pinkish deposit may be useful for orna Although but several specific embodiments of mental purposes, its lack of bond reduces its value the invention are herein described, it will be un for mechanical purposes such as piston and bear derstood that various changes in the sequence of ing surfaces. The upper limit of the lead Salt operations, steps and materials employed may be content is established by the lead salt concentra 3. 5 made without departing from the Spirit of the tion at which pure lead is deposited in a powdery invention. form upon the brass deposit. When coating We claim: aluminum alloy of the foregoing composition with 1. A bath for depositing a brass coating by the bath described for that purpose, the upper chemical displacement comprising from approxi limit of lead salt content is about .03 O2. per gal ...) mately 8 oz. to 45 oz. per gallon sodium Zincate, lon. The upper limit of the lead salt content in from approximately 25 oz. to 125 oz. per gallon creases with increased aluminum content of of sodium hydroxide, from approximately .1 oz. aluminum alloy being coated. When immersion to 6 oz. per gallon of copper cyanide, from coating pure aluminum, the lead Salt content approximately .1 oz. to 12 oz. per gallon of Sodium may be as high as .1 oz. per gallon but this value ; cyanide, from approximately .003 Oz. to .1 oz. per should not be substantially exceeded. gallon of basic lead carbonate, and the remain While the foregoing bath composition has been der water. found to be preferable in forming brass inner 2. A bath for depositing a brass coating by sion coatings on pistons of the above composition, chemical displacement on aluminum alloy of it has also been determined that exceptionally the class which includes of the order of 6.25% satisfactory results are obtainable in forming to 7.75% copper, 5% to 6% silicon, .15% to .40% brass coatings for various purposes on diverse magnesium, up to 1.5% iron, up to .75% im aluminum alloys, with baths having the following purities including zinc and the remainder range of compositions: - - aluminum; comprising approximately 15.8 OZ.
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