Chromium-free passivation solution for surface of hot-dip zinc-aluminum-magnesium steel plate and preparation method of hot-dip zinc-aluminum-magnesium chromium-free passivation plate

A chromium-free passivation, hot-dip galvanizing technology, applied in the direction of metal material coating process, can solve the problems of poor blackening resistance and corrosion resistance, unfavorable product application, lack of coating performance, etc., to achieve good environmental protection, The effect of good stability and excellent paintability

Inactive Publication Date: 2020-08-25
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
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  • Application Information

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Problems solved by technology

However, at present, the environmental protection surface treatment technology of zinc-aluminum-magnesium-coated steel sheets in China is still immature. During the surface treatment test process of zinc-aluminum-magnesium-coated steel sheets, it was found that ordinary chrome-free passivation coatings generally have problems of blackening resistance and poor corrosion resistance, which cannot meet the requirements "NSST / 72h rust area ≤ 5, color difference ≤ 4" requirements, and it does not have coating performance, which is not conducive to product application

Method used

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  • Chromium-free passivation solution for surface of hot-dip zinc-aluminum-magnesium steel plate and preparation method of hot-dip zinc-aluminum-magnesium chromium-free passivation plate
  • Chromium-free passivation solution for surface of hot-dip zinc-aluminum-magnesium steel plate and preparation method of hot-dip zinc-aluminum-magnesium chromium-free passivation plate

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preparation example Construction

[0029] 2. Preparation of hot-dip galvanized aluminum-magnesium chromium-free passivation plate:

[0030] Prepare hot-dip galvanized aluminum-magnesium alloy coated steel plate by conventional method, the chromium-free passivation solution on the surface of hot-dip galvanized aluminum-magnesium steel plate prepared in step 1 is coated on the surface of 2.5%Al-1.5%Mg-0.1%Si-Zn respectively by roll coating On the hot-dip galvanized aluminum-magnesium alloy coated steel plate, it is cured at a curing temperature of 95°C for 15 seconds to form a chromium-free passivation coating with a thickness of 0.5-2 μm, and cooled to room temperature to obtain a hot-dip galvanized aluminum-magnesium alloy coated chromium-free passivation coating. passivation plate passivation plate.

[0031] Chromium-free passivation solution (parts by weight) and pH on the surface of the steel plate in table 1

[0032]

[0033] In embodiment 1-9 and comparative example 1-5, the specific selection of each ...

Embodiment 6

[0035] In Example 6, unlike Example 1, the silicate is potassium silicate.

Embodiment 7

[0036] In embodiment 7, different from embodiment 1, the compound of strong oxidizing oxyacid ion is sodium periodate Na 5 IO 6 .

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Abstract

The invention discloses a chromium-free passivation solution for the surface of a hot-dip zinc-aluminum-magnesium steel plate and a preparation method of a hot-dip zinc-aluminum-magnesium chromium-free passivation plate, and belongs to the technical field of hot-hip zinc-aluminum-magnesium steel plates. The passivation solution is prepared from, by weight, 5-15 parts of silicate, 10-50 parts of strong oxidizing acid group ion containing compound, 5-30 parts of organic acid salt, 150-450 parts of waterborne polyurethane emulsion and 0.1-10 parts of a defoaming agent. The coating of the hot-dipzinc-aluminum-magnesium steel plate is prepared from, by weight, 1%-5% of Al, 0.2%-3% of Mg, 0%-0.3% Si and the balance Zn. After the passivation solution is used for hot-dip zinc-aluminum-magnesium steel plates, the steel plate has excellent environmental protection performance, coating property, corrosion resistance, blackness resistance, fingerprint resistance and water resistance.

Description

technical field [0001] The invention belongs to the technical field of hot-dip galvanized aluminum-magnesium steel sheets, and in particular relates to a chromium-free passivation solution on the surface of hot-dip galvanized aluminum-magnesium steel sheets and a preparation method for hot-dip galvanized aluminum-magnesium chromium-free passivation plates. Background technique [0002] As the user market has higher and higher requirements for material corrosion resistance, hot-dip galvanizing (GI) and hot-dip 55% Al-Zn alloy coating (GL) are widely used in construction, automobile and home appliance manufacturing industries all over the world. ) steel plate and so on belong to the "traditional" coated steel plate, and the hot-dip Zn-Al-Mg alloy coated steel plate is a new type of coated steel plate that has emerged as the times require. [0003] Zn-Al-Mg alloy coating attracted widespread attention abroad in the 1980s, and became the focus of research in the professional fie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/40C23C22/46C23C22/53C22C18/04
CPCC22C18/04C23C22/40C23C22/46C23C22/53
Inventor 董学强郭太雄金永清冉长荣
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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