Zinc alloy passivation treatment method and passivator

A passivation treatment and passivating agent technology, applied in the direction of metal material coating process and process efficiency improvement, can solve the problems of low decoration, short service life, poor bonding force of zinc alloy workpieces, etc., and achieve corrosion resistance. Good, improve the service life, the effect of uniform color brightness

Active Publication Date: 2020-03-24
广东东明新材科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the film thickness of the passivation film formed on the zinc alloy workpiece by the existing zinc alloy passivation film treatment method is uneven, the color is dull, not bright, the decoration is low, the bonding force with the zinc alloy workpiece is poor, and the corrosion resistance is low. Poor, short service life

Method used

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  • Zinc alloy passivation treatment method and passivator
  • Zinc alloy passivation treatment method and passivator
  • Zinc alloy passivation treatment method and passivator

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Experimental program
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Effect test

Embodiment approach

[0052] In one embodiment, before the operation of immersing the zinc alloy workpiece in the passivating agent, sulfuric acid, hydrofluoric acid, disodium EDTA and sodium isooctyl sulfate are also stirred, so that each component Mix uniformly to obtain an activator; wherein, the mass ratio of the sulfuric acid, the hydrofluoric acid, the disodium EDTA and the sodium isooctyl sulfate is (10~30):(1~10):(0.5 ~2): (0.2~2); immersing the zinc alloy workpiece in the activator to perform an activation operation.

[0053] It should be noted that the degreasing operation is one of the key procedures of the zinc alloy passivation treatment method. The sodium silicate remaining on the surface of the zinc alloy workpiece is removed through the activation operation, so as to avoid the reaction of sodium silicate and the acid in the passivation agent to form a colloid of silicic acid, which makes the passivation film foggy and causes the color of the passivation film Vividness and brightnes...

Embodiment 1

[0069] S111, dissolve 10g of sodium carbonate, 10g of sodium citrate, 3g of sodium gluconate, 5g of sodium metasilicate pentahydrate, 2g of TX-10 emulsifier and 3g of AEO-9 emulsifier in 1L of water, and perform a stirring operation so that each The components are mixed evenly to obtain a degreasing agent; the zinc alloy workpiece is soaked in the degreasing agent, and the degreasing operation is performed at a temperature of 45° C. for 5 minutes; washed with water for 3 times, each time for 20 seconds.

[0070] S121, 10g of 98% sulfuric acid, 6g of 55% hydrofluoric acid, 0.5g of disodium EDTA and 0.5g of sodium isooctyl sulfate are dissolved in 1L of water, and the stirring operation is carried out so that the components are uniformly mixed to obtain an activator; The zinc alloy workpiece was soaked in the activator, and activated at a temperature of 25° C. for 1.5 minutes; washed with water for 3 times, each time for 20 seconds.

[0071] S131, dissolve 0.5g potassium fluozir...

Embodiment 2

[0074] S112 is the same as step S111 in Embodiment 1.

[0075] S122 is the same as step S121 in Embodiment 1.

[0076] S132, dissolve 0.8g potassium fluozirconate, 0.5g chromium nitrate, 1g magnesium sulfate, 2g chromium sulfate, 0.5g hydroxyethylidene diphosphonic acid and 1g isooctyl sodium sulfate in 1L of water, and perform stirring operation so that each Mix the components evenly to obtain a passivating agent; add ammonia water to adjust the pH value of the passivating agent to 3.8; then soak the zinc alloy workpiece in the passivating agent and perform passivation at a temperature of 40°C 4min, to form a passivation film on the surface of the zinc alloy workpiece, the zinc alloy workpiece and the passivation film together constitute a zinc alloy passivation semi-finished product; wash with water 3 times, 20 seconds each time.

[0077]S142, same as step S141 of embodiment 1, see passivation effect Figure 5 , in the figure, the product on the right is the zinc alloy wor...

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Abstract

The invention relates to the technical field of metal passivation, and discloses a zinc alloy passivation treatment method and a passivator. The passivator includes the following components in parts by weight: 0.2 to 2 parts of fluorozirconic acid passivation main salt, 0.2 to 5 parts of nitrate oxidant, 0.5 to 10 parts of sulfate accelerator, 0.1 to 3 parts of organic acid complexing agent and 0.2 to 2 parts of surfactant. The zinc alloy passivation treatment method includes steps such as degreasing, activation, passivation, drying and the like to form a passivation film on the surface of a zinc alloy workpiece to obtain a zinc alloy passivation product. The zinc alloy passivation treatment method uses no phosphorus and hexavalent chromium, the obtained passivation film has the characteristics of high film formation uniformity, high color vividness and high brightness, good bonding force with zinc alloy workpieces, high corrosion resistance, and high adhesion to coatings.

Description

technical field [0001] The invention relates to the technical field of metal passivation, in particular to a zinc alloy passivation treatment method and a passivator. Background technique [0002] Zinc and zinc alloy coatings are widely used as protective and decorative coatings on parts of automobiles, motorcycles, daily hardware products, instruments and meters, and household appliances. It can be said that zinc and zinc alloy coatings are everywhere around us. However, the chemical properties of zinc are active, and it is easy to oxidize and corrode in the atmosphere, so almost all electro-galvanized layers and zinc alloy layers need passivation treatment process to achieve real anti-corrosion effect. After passivation treatment, the corrosion resistance of zinc and zinc alloy coatings can be increased by more than 6 times, and the zinc coating can be endowed with a beautiful decorative appearance and oxidation resistance. [0003] For a long time, most of the passivatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34C23C22/78C23G1/24
CPCC23C22/34C23C22/78C23G1/24Y02P10/20
Inventor 温远文霍浩文雪兵况金权
Owner 广东东明新材科技有限公司
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