Zinc-nickel alloy trivalent chromium black passivation solution and preparation method thereof

A technology of zinc-nickel alloy and trivalent chromium, which is applied in the field of passivation solution, can solve the problems of film adhesion and performance that are difficult to meet the requirements, roughness, film thickness, etc., and achieve convenient wastewater treatment and discharge, simple composition, good color Black and bright uniform effect

Inactive Publication Date: 2018-10-26
江苏秀博新材料有限公司
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AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the manufacturing industry, the requirements for electroplated zinc alloys are also getting higher and higher. The black passivation on the surface of zinc-nickel alloys is different from the natural color and blue-white passivation. The fi

Method used

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preparation example Construction

[0021] The preparation method of zinc-nickel alloy trivalent chromium black passivation solution of the present invention comprises the steps:

[0022] (1) Prepare A solution:

[0023] Provide chromium sulfate or chromium nitrate, cobalt nitrate, malonic acid and citric acid, add the balance of water to the mixed solution formed by each component to react, and obtain A solution.

[0024] Preferably, 100-200 grams of chromium sulfate or chromium nitrate and 100-150 grams of cobalt nitrate, 10-60 grams of malonic acid and 10-80 grams of citric acid are weighed. Add the rest of the water and react at 60~100°C.

[0025] (2) Prepare B solution:

[0026] Nitric acid, formic acid and glycine are provided, and the remaining amount of water is added to the mixed solution formed by each component, stirred and dissolved to obtain solution B.

[0027] Preferably, 100-200 grams of nitric acid, 100-200 grams of formic acid and 100-250 grams of glycine are weighed.

[0028] (3) Preparati...

Embodiment 1

[0037] Weigh 100g of chromium sulfate, dissolve it in 780g of water, and heat to 60~100°C. Slowly add 10g of malonic acid and 10g of citric acid and react for 2h to ensure complete reaction of chromium ions. Then add 100g of cobalt nitrate and stir until completely dissolved to obtain solution A; take 650g of water, add 100g of nitric acid, 100g of formic acid and 150g of glycine, stir and dissolve to obtain solution B.

[0038] Take the prepared A solution 100ml, B solution 50ml and add water to make 1L working solution, adjust the pH to 2.0 with 20% dilute sodium hydroxide and 20% dilute nitric acid. The zinc-nickel alloy layer was passivated in the passivation solution for 60s, dried and aged at 70-80°C for 15 minutes after subsequent sealing, and there was no white rust in salt spray for 240 hours.

Embodiment 2

[0040] Weigh 200g of chromium sulfate, dissolve it in 510g of water, and heat to 60~100°C. Slowly add 60g of malonic acid and 80g of citric acid and react for 2h to ensure complete reaction of chromium ions. Then add 150g of cobalt nitrate and stir until completely dissolved to obtain solution A; take 350g of water, add 200g of nitric acid, 250g of formic acid and 200g of glycine, stir and dissolve to obtain solution B.

[0041] Take the prepared A solution 100ml, B solution 50ml and add water to make 1L working solution, adjust the pH to 2.0 with 20% dilute sodium hydroxide and 20% dilute nitric acid. The zinc-nickel alloy layer was passivated in the passivation solution for 60s, dried and aged at 70-80°C for 15 minutes after subsequent sealing, and there was no white rust in 120 hours of salt spray.

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Abstract

The invention provides a zinc-nickel alloy trivalent chromium black passivation solution and a preparation method thereof. The preparation method comprises the following steps of 1, preparing a solution A; 2, preparing a solution B; and 3, preparing a working solution. In the step 1, chromium sulfate or chromium nitrate, cobalt nitrate, malonic acid and citric acid are provided, the balance of water is added into the mixed solution formed by the components to carry out reaction, and the solution A is obtained; and in the step 2, nitric acid, formic acid and glycine are provided, the balanceof water is added into the mixed solution formed by the components for stirring and dissolving so as to obtain the solution B; and in the step 3, the deionized water is mixed with the obtained solution A and the solution B, and is uniformly stirred to obtain the zinc-nickel alloy black trivalent chromium passivation solution. The passivation solution is simple in composition, and no hexavalent chromium, no fluorine and phosphorus are contained in the whole production process, the passivation solution is more environment-friendly, and wastewater treatment and emission are facilitated.

Description

technical field [0001] The invention relates to a passivation solution, in particular to a zinc-nickel alloy trivalent chromium black passivation solution and a preparation method thereof. Background technique [0002] With the rapid development of the manufacturing industry, the requirements for electroplated zinc alloys are also getting higher and higher. The black passivation on the surface of zinc-nickel alloys is different from the natural color and blue-white passivation. The film layer is relatively thick and rough, so the adhesion of the film layer It is difficult to meet the requirements of focus and performance. The traditional chromate passivation process is stable, the appearance of the film is full in color, and it has good corrosion resistance. However, due to the toxicity of hexavalent chromium and the pollution to the environment, the trivalent chromium black passivation process has gradually replaced it. Therefore, it is necessary to provide a trivalent ch...

Claims

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Application Information

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IPC IPC(8): C23C22/53
CPCC23C22/53C23C2222/10
Inventor 曹小云刘晓婷王洪明
Owner 江苏秀博新材料有限公司
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