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Plating solution for electroplating matt zinc and preparation thereof

A zinc plating solution, matte technology, applied in the field of surface treatment of metal materials, can solve the problems of many organic inclusions, easy discoloration of the coating, and many decomposition products, etc., and achieves the effect of high main salt content, soft luster and simple composition.

Inactive Publication Date: 2009-01-21
武汉奥邦表面技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects existing in ordinary electro-galvanizing technology, that is, there is a large dependence on conventional additives, many decomposition products, a lot of organic matter in the coating, high brittleness, easy discoloration of the coating, and poor corrosion resistance. The purpose of the present invention is to provide a plating solution for electroplating matte zinc and its preparation method, which does not need to be passivated with chromium, and can be directly sealed, reducing the passivation process in the traditional galvanizing process , reduces the harm of chromium metal to the environment, and can obtain a matte coating with hazy appearance, soft luster, good diffuse reflection and fine structure, less pores, low internal stress and good corrosion resistance

Method used

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  • Plating solution for electroplating matt zinc and preparation thereof
  • Plating solution for electroplating matt zinc and preparation thereof
  • Plating solution for electroplating matt zinc and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: [preparation of methylene dinaphthalene]

[0040] a. Mix 9.0-12.8g of methylnaphthalene and 11.2g-13.8g of sulfuric acid, add it into a three-necked flask equipped with a thermometer and electric stirring, and react under strong stirring for 3-4 hours;

[0041] b. the mixed solution obtained in a is naturally cooled and crystallized at normal temperature;

[0042] c. Add the crystals obtained in b into a condensation reaction tank containing 6-9g formaldehyde, and condense for 2-3 hours under the condition of 168-196kPa;

[0043] d. Adding NaOH with a mass fraction of 40% to the condensation reaction tank to adjust the pH to 8-10;

[0044] e. the mixed solution obtained in d is naturally cooled and crystallized at normal temperature;

[0045] f. Filtrate to obtain the crystal in e, dry, and then use distilled water to configure a solution with a mass fraction of 40% to obtain methylene dinaphthalene.

Embodiment 2

[0046] Embodiment 2: [preparation of poly(acrylamide / sodium acrylate N-octylacrylamide)]

[0047] a. Dissolve 0.024-0.028mol of triethylamine and 0.022-0.024mol of n-octylamine in 20-40ml of tetrahydrofuran;

[0048] b. Pour the mixture obtained in a into a four-necked bottle equipped with a thermometer, a nitrogen pipe, and an electric stirrer, and control the temperature at 0-5°C. Slowly drop 0.022-0.023 mol of acryloyl chloride into the four-necked bottle. Raise the temperature to 10-15°C, and keep it warm for 2-4 hours under the condition of vigorous stirring;

[0049] c. the mixed solution obtained in b is desolventized with a vacuum distillation device;

[0050] d. crystallize the mixed solution after desolvation in acetone at -5°C, the volume ratio of acetone and the mixed solution after desolventization is 2:1;

[0051] e. Add the crystals obtained in d., 20-30ml of deionized water, 0.022-0.0024mol of acryloyl chloride, and 0.5-0.8g of SDS (Sodium dodecyl sulfate) in...

Embodiment 3

[0054] Embodiment 3: [preparation of matte zinc intermediate]

[0055] a. Take 480-520g of n-octanol into a three-neck flask with stirring, add 5-8g of NaOH and 5-10g of water;

[0056] b. Stir vigorously and gradually heat up;

[0057] c. Dehydration under a vacuum of -0.05MPa;

[0058] d. Heat up to 110-120°C until dehydration is complete and continue to heat up to 150-200°C;

[0059] e. Exhaust air and inject nitrogen;

[0060] f. Add ethylene oxide under stirring, the reaction pressure is 0.2-0.4MPa, and the reaction temperature is 160-180°C;

[0061] g. Discharge when the cloud point is 40-50, put it into a three-necked flask with stirring, and heat up to 60-70°C;

[0062] h. Take 200-240g of sulfuric acid and add it dropwise, and control the temperature at 90-100°C. After dropping for 1 hour, cool down to 60-70°C and take 50% NaOH to adjust the pH to 6.5-7.5 to obtain the mother liquor;

[0063] i. The mother liquor is allowed to stand for stratification, the lower ...

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PUM

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Abstract

Plating solution used for electroplating matt zinc and a preparation method thereof relate to a matt zinc electroplating process in the surface treatment of a metallic material. The plating solution is characterized in that the compositions of the plating solution comprise a matt zinc addition agent A and a matt zinc addition agent B, wherein the matt zinc addition agent A is a mixture of methylene dinaphthyl and poly(acrylamide / sodium acrylate / N-octylacrylamide); and the matt zinc addition agent B is 4-(4-hydroxyl) phenyl-3 butylene-2-ketone. When the plating solution is adopted, a matt plating coat with obscure appearance, soft luster, better diffused reflection, fine structure, fewer pores, low internal stress and excellent corrosion resistance can be obtained.

Description

[technical field] [0001] The invention relates to surface treatment of metal materials. More specifically, it relates to a plating solution for electroplating matte zinc and a preparation method thereof. [Background technique] [0002] Conventional galvanizing solutions worldwide are mainly divided into: sulfate galvanizing solution, chloride galvanizing solution, zincate galvanizing solution, and ammonium salt galvanizing solution. The zinc current efficiency of the sulfate bath is high, and a high current density can be used, and a bright zinc coating can be obtained in a short time. Chloride galvanizing solution is a bright electroplating process developed in the 1980s. It is characterized by no complexing agent, easy wastewater treatment, and better brightness and leveling of the coating than other conventional galvanizing. The zincate galvanizing bath is stable and easy to operate and maintain, but the deposition speed of the zinc layer is slow. The ammonium salt gal...

Claims

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Application Information

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IPC IPC(8): C25D3/22
Inventor 吕志周长虹陈文利魏磊吕明威肖洪兵
Owner 武汉奥邦表面技术有限公司
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