Composite chrome plating additive

An additive and composite technology, applied in the field of chrome plating, can solve the problems of corrosion anode and narrow bright range, decrease of coating anti-corrosion ability, difficulty in controlling process parameters, etc., achieve wide process bright range, inhibit anode corrosion, and simple operation process Effect

Active Publication Date: 2013-07-24
太原特益达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the chromium plating process, the first catalyst is fluorine ion or fluosilicic acid, etc., with high current efficiency and fine and bright coating, but it will corrode the anode and the coating substrate, so the accumulation of impurities in the solution is fast, the process is difficult to control, and the plating tank is easy to age. scrapped
Alkanesulphonic acid or its salts were first used in the chromium plating process by Politecnico in Milan. The coating is bright and crystallized, but the corrosion anode and bright range are narrow, and the depth capability is not good. The Hall cell test piece is 9cm, especially used Paraffin sulfonate, the anti-corrosion ability of the coating is reduced
The rare earth additives disclosed in Chinese patents CN89105414.6 and CN87102034 are all low-temperature and low-concentration chromium plating processes, but it is difficult to control process parameters when applied to standard electroplating solutions
With the comprehensive utilization of carboxylic acid and iodine as additives, there is also the problem that the coating is brittle and easy to crack

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Prepare composite chrome plating additives by weight as follows:

[0049] Methanedisulfonic acid: 4 grams

[0050] Methanesulfonic acid: 1 g

[0051] Sulfamic acid: 1 g

[0052]Lanthanum fluoride: 0.06 g

[0053] Arsenic oxide: 0.1 g

[0054] The above-mentioned components are mixed to obtain the composite chrome plating additive of this embodiment.

[0055] The chromium plating bath contains 150 g / L chromic anhydride and 1.5 g / L sulfuric acid, the above-mentioned composite chrome plating additive is added in an amount of 3 g / L chromium plating bath, the working process range: temperature 30°C, current density 15A / dm 2 , S anode: S cathode ≧ 2:1 (cathode, anode area ratio), time 1 hour.

[0056] After the test, the results can be seen: the coating of the entire test piece is bright and meticulous, the finish presents a mirror brightness, the hardness of the coating is high, and the Vickers hardness is 900HV. In the angle experiment, the test pieces with 90° and 30...

Embodiment 2

[0059] Prepare composite chrome plating additives by weight as follows:

[0060] Alkylsulfonic acid: 4 grams

[0061] Glycine: 0.08 g

[0062] Triazole: 0.01 g

[0063] Cerium fluoride: 0.04 g

[0064] Bismuth oxide: 0.05 g

[0065] The above-mentioned components are mixed to obtain the composite chrome plating additive of this embodiment.

[0066] Chromium plating solution, chromium plating solution contains 300 g / L chromic anhydride and 3.2 g / L sulfuric acid, the above-mentioned composite chrome plating additive is 4.18 g / L chrome plating solution, working process range: temperature 68°C, current density 50A / dm 2 , Plating time 1 hour.

[0067] After the test, the results can be seen: the coating of the entire test piece is bright and meticulous, the finish shows mirror brightness, the hardness of the coating is high, and the Vickers hardness is 1110HV. In the angle test, the test pieces with 90° and 30° angles are coated with a thickness of 55 μm. Current efficiency ...

Embodiment 3

[0081] Prepare composite chrome plating additives by weight as follows:

[0082] Methanesulfonic acid: 5.8 grams

[0083] Lanthanum fluoride 0.006 g

[0084] Chromium plating bath: chromic anhydride (CrO 3 ) 250g / L, sulfuric acid (H 2 SO 4 ) 2.6g / L, the above composite chrome plating additive 5.5g / L chrome plating solution, current density 30A / dm 2 , temperature 58°C, time 1h.

[0085] After plating inspection, the finish is mirror-bright, with a hardness of 1280HV. In the angle test, the test pieces at 90° and 30° angles have coatings, the thickness is 33 μm, and the current efficiency is 31%. The weight of the anode before plating: 34.56 grams, and the weight of the anode after plating: 29.85 grams, anode weight loss: 4.71 grams.

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Abstract

The invention discloses a composite chrome plating additive comprising an organic matter and an inorganic matter. The organic matter is alkyl-chain sulfonic acid and / or alkyl-chain disulfonic acid with a dose of 1-20g / L of standard chrome plating liquid. Or the organic matter is 0.01-0.1g / L of a nitrogen-containing organic compound. The inorganic matter is light rare earth fluoride with a dose of 0.001-0.01g / L of standard chrome plating liquid, and / or one of VA element oxides, hydroxides, and sulfates, wherein the dose of the VA element oxide or hydroxide or sulfate is 0.01-0.1g / L of standard chrome plating liquid. According to the invention, the organic matter and the inorganic matter are added into the standard chrome plating solution, such that advantages such as high current efficiency, good plating brightness, wide process brightness range, and good deep plating performance are provided. The plating has the advantages of high hardness, high current efficiency, no anode corrosion, wide process brightness range, good deep plating performance, simple operation process, and low cost.

Description

technical field [0001] The invention relates to the technical field of chrome plating, in particular to a composite chrome plating additive. Background technique [0002] In the chromium plating process, the first catalyst is fluorine ion or fluosilicic acid, etc., with high current efficiency and fine and bright coating, but it will corrode the anode and the coating substrate, so the accumulation of impurities in the solution is fast, the process is difficult to control, and the plating tank is easy to age. scrapped. Alkanesulphonic acid or its salts were first used in the chromium plating process by Politecnico in Milan. The coating is bright and crystallized, but the corrosion anode and bright range are narrow, and the depth capability is not good. The Hall cell test piece is 9cm, especially used Paraffin sulfonate, the anti-corrosion ability of the coating is reduced. The rare earth additives disclosed in Chinese patents CN89105414.6 and CN87102034 are all low-temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/04C25D3/10
Inventor 闫瑞景赵鑫闫景芳贾雅博梁镇海范慧阳
Owner 太原特益达科技有限公司
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