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Cleaning dedusting agent and die-cast zinc alloy pretreatment method

A dust remover and zinc alloy technology, applied in the field of die-casting zinc alloy surface treatment, can solve problems such as difficult to clean, difficult to deal with yellow, endangering the health of operators, etc.

Inactive Publication Date: 2017-10-20
广东东明新材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To remove the oxide layer on the surface of the zinc alloy, pickling or alkali washing is required. The product after pickling or alkali washing is a loose black gray layer adhered to the surface of the zinc alloy, which is difficult to remove and will affect the subsequent surface treatment, such as Density of the sealing layer or plating layer
In large-scale industrial production, the loose black gray layer on the surface of zinc alloy after pickling and alkali washing is generally used in the following process formula: sodium m-nitrobenzenesulfonate (anti-staining salt) 5-15 g / L, sodium cyanide 5-15 g / L, sodium nitrate 1-3 g / L, temperature, normal temperature; time, 30-60 seconds, however, this traditional craft formula contains highly toxic sodium cyanide, which seriously endangers the health of operators
Sodium m-nitrobenzene sulfonate (anti-staining salt S) wastewater is difficult to treat, and it is difficult to deal with the yellow color in water polluted by m-nitrobenzene sulfonate (anti-staining salt S)

Method used

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  • Cleaning dedusting agent and die-cast zinc alloy pretreatment method
  • Cleaning dedusting agent and die-cast zinc alloy pretreatment method
  • Cleaning dedusting agent and die-cast zinc alloy pretreatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1. Degreasing: use sodium carbonate 10 g / L, sodium tripolyphosphate 20 g / L, sodium tetraborate 5 g / L, sodium gluconate 2 g / L, OP-10 emulsifier 1.5 g / L, temperature 60 degrees , processed for 6 minutes. After washing with water, put it into the pickling solution below;

[0058] 2. Pickling: use 10ml of sulfuric acid, 10ml / liter of hydrofluoric acid, 0.2ml / liter of low-foaming surfactant, and treat at room temperature for 5-10 seconds. After washing with water, put it into the following treatment solution for processing;

[0059] 3. Whitening: diethylenetriamine 30-80 g / L; triethylenetetramine 30-80 g / L; hydroxyethylidene diphosphonic acid (HEDP) 1-25 g / L; potassium persulfate 1-25 g 1-25 g / L ammonium persulfate; 1-25 g / L 50% hydrogen peroxide; 0.1-1 ml / L surfactant; the balance is water. The temperature is 20-30 degrees, and the time is 5 minutes.

[0060] 4. Trivalent chromization or electroplating: put the above-mentioned treated die-cast zinc alloy workpiece into ...

Embodiment 2

[0064] 1. Degreasing: use sodium carbonate 10 g / L, sodium tripolyphosphate 20 g / L, sodium tetraborate 5 g / L, sodium gluconate 2 g / L, OP-10 emulsifier 1.5 g / L, temperature 60 degrees , processed for 6 minutes. After washing with water, put it into the pickling solution below;

[0065] 2. Pickling: use 10ml of sulfuric acid, 10ml / liter of hydrofluoric acid, 0.2ml / liter of low-foaming surfactant, and treat at room temperature for 5-10 seconds. After washing with water, put it into the following treatment solution for processing;

[0066] 3. Whitening: diethylenetriamine 30-50 g / L; triethylenetetramine 30-50 g / L; hydroxyethylidene diphosphonic acid (HEDP) 1-25 g / L; potassium persulfate 1-25 g 1-25 grams / liter of ammonium persulfate; 1-25 grams / liter of 50% hydrogen peroxide; 0.1-1 milliliter / liter of surfactant, and the balance is water. The temperature is 20-30 degrees, and the time is 5 minutes. 4. Trivalent chromization or electroplating: put the above-mentioned treated die...

Embodiment 3

[0070] 1. Degreasing: use sodium carbonate 10 g / L, sodium tripolyphosphate 20 g / L, sodium tetraborate 5 g / L, sodium gluconate 2 g / L, OP-10 emulsifier 1.5 g / L, temperature 60 degrees , processed for 6 minutes. After washing with water, put it into the pickling solution below;

[0071] 2. Pickling: use 10ml of sulfuric acid, 10ml / liter of hydrofluoric acid, 0.2ml / liter of low-foaming surfactant, and treat at room temperature for 5-10 seconds. After washing with water, put it into the following treatment solution for processing;

[0072] 3. Whitening: Diethylene triamine 30 g / L; Triethylene tetramine 50 g / L; Hydroxyethylidene diphosphonic acid (HEDP) 6 g / L; Potassium persulfate 1 g / L; Ammonium persulfate 1 g / liter; 50% hydrogen peroxide 20 grams / liter; surfactant 0.1 ~ 1 ml / liter, the balance is water. The temperature is 20-30 degrees, and the time is 5 minutes.

[0073] 4. Trivalent chromization or electroplating: put the above-mentioned treated die-cast zinc alloy wor...

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Abstract

The invention discloses a cleaning dedusting agent and a die-cast zinc alloy pretreatment method. The cleaning dedusting agent is prepared from the following components with the following concentrations: 30 to 80 g / L of diethylenetriamine, 30 to 80 g / L of triethylene tetramine, 1 to 25 g / L of etidronic acid, 1 to 25 g / L of potassium peroxodisulfate, 1 to 25 g / L of ammonium persulfate, 1 to 25 g / L of hydrogen peroxide, 0.1 to 1 ml / L of a surfactant and the balance of water. The environmentally-friendly surface cleaning dedusting agent for a die-cast zinc alloy can enable a dusty zinc alloy surface, which is blackened by acid pickling, to be a semi-bright or clean and bright metal surface, and subsequent surface treatment is facilitated, such as chromate-free passivation or electroplating with other metals. The cleaning dedusting agent facilitates environmental protection and is relatively high in safety; wastewater is nontoxic, and wastewater treatment is facilitated; and the treated zinc alloy surface is high in adhesive force to a coating.

Description

technical field [0001] The invention relates to the technical field of die-casting zinc alloy surface treatment, in particular to a whitening and dust-removing agent and a pre-treatment method for die-casting zinc alloy. Background technique [0002] At present, the material cost of zinc alloy die-casting parts is low, and the die-casting method can be used to form parts with small tolerances and complex shapes in one step, with high production efficiency and low processing costs. At the same time, zinc is widely distributed in nature and has a large reserve. Therefore, it is widely used in industry. Zinc alloy die castings are widely used in structural and decorative parts with low stress and complex shapes, especially to replace copper, copper alloy and steel materials. To remove the oxide layer on the surface of the zinc alloy, pickling or alkali washing is required. The product after pickling or alkali washing is a loose black gray layer adhered to the surface of the z...

Claims

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Application Information

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IPC IPC(8): C23G1/10C25D5/34
CPCC23G1/10C25D5/34
Inventor 熊猛况金权霍浩杨丁
Owner 广东东明新材科技有限公司
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