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Zinc-aluminum-magnesium coating surface treatment agent and preparation method and use method thereof

A surface treatment agent, zinc-aluminum-magnesium technology, applied in coating, hot-dip plating process, metal material coating process, etc., can solve the problems of undetermined performance, unseen and other problems, and improve corrosion resistance. , The effect of improving compactness and excellent blackening resistance

Active Publication Date: 2022-07-15
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above three coatings disclose that the environmental passivation coating has good corrosion resistance and blackening resistance, there is no clear or standard test method to characterize it, and it is impossible to determine the pros and cons of its performance; and by production practice According to the results obtained by users, blackening is a chronic disease of zinc, aluminum and magnesium products. At present, there is no environmentally friendly surface coating with excellent blackening resistance in China.

Method used

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  • Zinc-aluminum-magnesium coating surface treatment agent and preparation method and use method thereof
  • Zinc-aluminum-magnesium coating surface treatment agent and preparation method and use method thereof

Examples

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preparation example Construction

[0034] Further, the present invention also provides a preparation method of the above-mentioned zinc-aluminum-magnesium coating surface treatment agent, which comprises the following steps: taking each component by weight, dissolving a weakly alkaline medium in water, and then adding fluoride and periodic acid After dissolving the salt, add water-based organic resin, and finally add colloidal silica, and stir to obtain.

[0035] In a weakly alkaline environment, fluoride and periodate are more easily dissolved, complete and stable, so the present invention first dissolves the weakly alkaline medium in water to make the system in alkaline conditions; in addition, in order to make fluoride and periodate Salts are easier to dissolve, and one of them can be added first, and then the other component is added after dissolving; then adding water-based organic resin and colloidal silica, the stability of the surface treatment agent is better. By controlling the order of addition and a...

Embodiment 7

[0047] In Example 7, the difference from Example 1 is that the weakly alkaline medium is sodium oxalate.

Embodiment 8

[0048] In Example 8, the difference from Example 1 is that the water-based organic resin is a water-based silicone acrylic resin.

[0049] Preparation of Surface Treatment Agent

[0050] Take each component by weight, dissolve the weak alkaline medium in water, then add fluoride, add periodate after dissolving, add water-based organic resin after dissolving, finally add colloidal silica, and stir evenly.

[0051] Surface treatment of hot-dip galvanized aluminum-magnesium alloy coated steel plate

[0052] The surface treatment agents obtained in Examples 1 to 8 and Comparative Examples 1 to 5 were respectively roll-coated on hot-dip galvanized aluminum-magnesium alloy coated steel sheets of 2.5wt% Al-2.5wt% Mg-Zn, and the curing temperature was 95°C (The curing temperature was determined by using a temperature measuring paper) for 20 s to obtain hot-dip galvanized aluminum-magnesium coated plates 1-8 and comparative examples L1-L5, respectively.

[0053] Table 2 Coating thick...

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Abstract

The invention discloses a zinc-aluminum-magnesium coating surface treatment agent and a preparation method and a use method thereof, belonging to the technical field of zinc-aluminum-magnesium alloy coating steel plate surface treatment. The invention provides a surface treatment agent for zinc-aluminum-magnesium coating, which comprises 1-5 parts of fluoride, high iodine 3-10 parts of acid salt, 0.5-5 parts of weak alkaline medium, 20-50 parts of water-based organic resin, 5-15 parts of colloidal silica and 100 parts of water. In the invention, fluoride and periodate react with Mg on the surface of the coating layer under weak alkaline conditions to form a dense film layer, the water-based organic resin adheres to the surface of the coating layer, and the colloidal silica is filled in the gap, which effectively hinders the coating layer. The contact with water vapor and oxygen in the environment significantly improves the corrosion resistance, blackening resistance, water resistance and fingerprint resistance of the surface coating.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of zinc-aluminum-magnesium alloy coated steel sheets, and particularly relates to a zinc-aluminum-magnesium coating surface treatment agent and a preparation method and use method thereof. Background technique [0002] Zn-Al-Mg alloy coated steel sheet has better corrosion resistance, excellent processing and application properties (formability, weldability and paintability), and the trend of replacing the current corresponding hot-dip galvanized or zinc alloy coated steel sheet is increasingly obvious. [0003] Existing hot-dip Zn-Al-Mg alloy coated steel sheets can be divided into "low aluminum" (W Al < 5%), "medium aluminum" (5%≤WAl < 13%) and "high aluminum" (47%≤ W Al≤57%) three types. With the increase of Al and Mg content, the corrosion resistance of the coating increases, but the formability and weldability decrease. In the fields of home appliances and automobiles, in or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D167/08C09D133/04C09D5/08C09D7/61C23C22/60C23C2/26C23C2/40C23C2/06
CPCC09D163/00C09D167/08C09D143/04C09D5/08C09D7/61C23C22/60C23C2/26C23C2/40C23C2/06C08K2201/011C08K3/36C08K3/16
Inventor 宋裕董学强周磊磊汤佩林王飞龙余腾义
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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