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Zinc-aluminum-magnesium coating passivating agent, passivating film and passivating plate

A zinc-aluminum-magnesium and passivating agent technology, applied in coating, hot-dip plating process, metal material coating process, etc., can solve problems such as blackening and inability to meet welding purposes, and achieve poor flexibility and improve welding performance Effect

Active Publication Date: 2021-11-26
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Aiming at the zinc-aluminum-magnesium coating passivation in the prior art can not meet the welding purposes, the present invention proposes a zinc-aluminum-magnesium coating passivation agent, passivation film and passivation Chemical plate, through the design of inorganic salt components, solves the problem of blackening of zinc-aluminum-magnesium coating, and improves the welding performance of zinc-aluminum-magnesium coating passivation plate

Method used

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  • Zinc-aluminum-magnesium coating passivating agent, passivating film and passivating plate
  • Zinc-aluminum-magnesium coating passivating agent, passivating film and passivating plate

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Embodiment

[0039] The zinc-aluminum-magnesium coating passivator of the present embodiment comprises the following components by weight: 10-20% inorganic salt, 2-5% hydrogen peroxide, 5-10% modified nano-zirconia sol, 1-3% phosphoric acid , 0.5-1% hydrofluoric acid and the balance of deionized water. The passivation agent of this solution is mainly an inorganic salt system, which can significantly improve the welding performance of the passivation plate. At the same time, adding modified nano-zirconia sol can improve the poor flexibility of the inorganic passivation film after the passivation agent is formed. When the content of inorganic salt in the passivation solution is small, it cannot play the role of passivation and corrosion resistance. When the content is large, it is difficult to form a film synergistically with other components. Therefore, the addition of inorganic salt is controlled at 10-20% in this plan. Hydrogen peroxide is a film-forming accelerator, which is beneficial t...

Embodiment 5

[0057] The surface microstructure of embodiment 5 is as figure 2 , 3 As shown, the passivating agent is enriched at the trough of the smooth surface (black area), the white phase of the coating structure area 1 is the Zn-rich phase, and the area 2 is Zn-MgZn 2 Binary eutectic phase (white phase) + aluminum-rich phase (black phase), zone 3 is Zn-Al-MgZn 2 In the ternary eutectic phase, the lamellar spacing of the ternary eutectic phase is smaller than that of the binary eutectic phase, both of which are less than 1 μm.

[0058] The comparative tests of the embodiments of the present invention and comparative examples are corrosion resistance test, blackening resistance test and welding test. The specific test and evaluation methods are as follows:

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Abstract

The invention discloses a zinc-aluminum-magnesium coating passivating agent, a passivating film and a passivating plate, and relates to the field of hot-dip zinc-aluminum-magnesium steel plates. The zinc-aluminum-magnesium coating passivating agent comprises the following components of, in percentage by weight, 10-20% of inorganic salt, 2-5% of hydrogen peroxide, 5-10% of modified nano zirconium oxide sol, 1-3% of phosphoric acid, 0.5-1% of hydrofluoric acid and the balance deionized water. According to the scheme, the passivating agent is mainly based on an inorganic salt system, the welding performance of a passivating plate can be remarkably improved, meanwhile, the modified nano-zirconia sol is added, the problem that the flexibility of an inorganic passivating film is poor after the passivating agent forms a film can be solved, and meanwhile a zinc-aluminum-magnesium coating steel plate prepared from passivating solution and the passivating film has excellent blackening resistance.

Description

technical field [0001] The invention relates to the field of hot-dip zinc-aluminum-magnesium steel plates, and more specifically relates to a zinc-aluminum-magnesium coating passivation agent, a passivation film and a passivation plate. Background technique [0002] Zinc-aluminum-magnesium-coated steel sheet is a new type of long-life, energy-saving steel material with excellent corrosion resistance. The service life is 5 to 15 times that of pure zinc coating, and its coating and welding properties are equivalent to pure zinc coating. However, since the magnesium element is relatively active and prone to oxidation reactions, the zinc-aluminum-magnesium coating is prone to blackening, and passivation treatment is usually adopted to alleviate this problem. At the same time, in the field of household appliances and automobiles, not only the steel plate is required to have good formability, but also the steel plate is required to have excellent welding performance. However, most...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/36C23C2/06C23C2/26
CPCC23C22/361C23C2/06C23C2/26C23C2222/20
Inventor 李伟刚杨平王滕刘茂林刘劼
Owner MAANSHAN IRON & STEEL CO LTD
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