Process for extracting Zn-Ni alloy from electrolyte
An electrolyte, zinc-nickel technology, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of unusable, small current density range, limitation, etc., and achieve the effect that the possibility of falling off is small
Inactive Publication Date: 2006-12-20
ENTHONE INC
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Problems solved by technology
The overall disadvantage is that the range of current densities that can be used in ammonia-free baths is particularly small and therefore unacceptably limited when electrolyzing
Only workpieces with very simple geometries can be plated in this way, and some electroplating techniques, such as drum plating, cannot be used due to some limitations
Method used
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Experimental program
Comparison scheme
Effect test
example 7
[0048] Nickel chloride (6 water molecules) 143g / l
[0049] Potassium chloride 245g / l
[0050] Boric acid 25g / l
[0051] Amino acid 45g / l
[0052] gloss agent 2g / l
[0053] pH 5.3-5.
example 8
[0055] Zinc chloride 115g / l
[0056] Nickel chloride (6 water molecules) 143g / l
[0057] Potassium chloride 245g / l
[0058] Boric acid 25g / l
[0059] 2-Hydroxypropionic acid 45g / l
[0060] gloss agent 2g / l
[0061] pH 5.3-5.7
[0062] According to an embodiment variant, the temperature of the electrolyte during electroplating is below 35° C., thereby improving the adhesion properties of the coating. This makes the coating not fall off after some time, and according to the method of the invention, the quality of the electrolyte-plated zinc-nickel alloy of the invention is improved.
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Abstract
The poresent invention relates to a method of depositing a zinc-nickel alloy from an electrolyte, which is characterized in that at least one aromatic carboxylic acid and its salt and / or its derivative or at least one aliphatic carboxylic acid and its salt and / or its derivative or at least one aromatic carboxylic acid and / or aliphatic carboxylic acid and their salts and / or their derivatives are added into the electrolyte so as to expand the range of applicable current densities. Further, an electrolyte suitable for this method is provided. By this method, it becomes possible to plate the metal work piece having a deformed cross section because the useful zinc-nickel alloy can be deposited over a wide range of current densities. In this method, the alloy can be deposited from an electrolyte free from ammonia. Thereby, the pollution of exhaust water can be advantageously reduced.
Description
technical field [0001] The invention relates to a method for precipitating a zinc-nickel alloy from an electrolyte. Background technique [0002] In order to improve corrosion resistance, it is necessary to provide an electroplating layer on a metal base material. Zinc-nickel alloys are of interest in many fields due to their higher corrosion resistance than pure zinc coatings. [0003] Zinc-nickel alloys contain at least 10% to 16% zinc, because this material has the best corrosion resistance. For the precipitation of zinc-nickel alloys, basically two different electrolytes are used in the prior art. One of the two electrolytes is an alkaline zinc-nickel alloy plating solution, and the other is an ammonia-containing, weakly acidic and chloride-containing plating solution. However, these plating solutions have significant disadvantages. [0004] Disadvantages of alkaline baths are the low precipitation rate and the difficulty of electroplating directly from such baths on...
Claims
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IPC IPC(8): C25D3/56C25D11/10
CPCC25D3/565C25D11/10
Inventor 韦海穆斯·马西亚·约翰内斯·科内利斯·费尔贝纳卡尔-海因茨·范德内尔托马斯·黑尔登
Owner ENTHONE INC