Chromium-free passivation liquid for galvanized sheet
A chromium-free passivation, galvanized sheet technology, applied in the direction of metal material coating process, can solve problems such as imperfection and increase in production cost, and achieve the effects of wide application range, increased corrosion resistance, and increased anti-discoloration ability
Inactive Publication Date: 2010-07-14
沈阳宏迪科技有限公司
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AI Technical Summary
Problems solved by technology
Although it has relatively met the environmental protection requirements, there are still imperfections, such as: the increase of production costs, the influence of factors such as use conditions and service life
Method used
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Experimental program
Comparison scheme
Effect test
example 1
[0021] Epoxy resin 8g
[0023] Sulfonic acid polymaleic anhydride 2g
[0024] Fe 20g
[0025] Water 1Kg
[0026] Time: 3 seconds, temperature: 40°C
[0027] The production method is to add the above ingredients to the water in order and stir until all are dissolved.
[0028] The process steps of the present invention for chromium-free passivation on the galvanized steel sheet are: degreasing→water washing→galvanizing→leveling→passivation. According to needs, it can be rolled or soaked. The passivation time is 2-10 seconds and the temperature is 15-45°C. °C
example 2
[0030] Epoxy resin 8g
[0032] Sulfonic acid polymaleic anhydride 2g
[0033] Fe 20g
[0034] Water 1Kg
[0035] Time: 3 seconds, temperature: 30°C. The production method is the same as in Example 1.
example 3
[0037] Acrylic resin 8g
[0038] Ammonium molybdate 10g
[0039] Sulfonic acid polymaleic anhydride 7g
[0040] Fe 20g
[0041] Water 1Kg
[0042] Time: 4 seconds, temperature: 15°C. The production method is the same as in Example 1.
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The invention discloses an environment protective galvanized sheet passivating fluid with no chromium used for treating surfaces of galvanized sheets; and the technical key point of the invention is that a certain amount of resin, ammonium molybdate, sulfonic acid polymaleic anhydride and iron are added in sequence into water to be stirred until the added substances are dissolved. The invention does not comprise chromium and silicon with any valence and is an environmentally-sound passivating fluid which is called totally green (totally green) passivating liquid in foreign countries with maincomponents of polymer materials and without any metals or pollution to the environment or harm to the human body. The galvanized sheet passivating fluid is very wide in application ranges and all industries with the application of galvanizing sheets need passivation such as the electro galvanizing sheets, the aluminum galvanizing sheets and hot dip galvanizing sheets; as the nationwide application and development of passivation with no chromium is in the starting state, the invention has considerable industrialized prospects.
Description
Technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to an environment-friendly chromium-free passivation solution for galvanized sheets. Background technique [0002] In order to improve the anti-corrosion performance of the galvanized steel sheet, it is usually necessary to perform surface chromization treatment on the galvanized steel sheet. Although the effect of chromization is good and the cost is low, it is very harmful to the environment and human body, causing serious pollution to water quality. In the third and twelfth part of the safety data sheet (MSDS) of chromic anhydride, it clearly describes its hazards to health and the ecological environment: [0003] Health hazards: Acute poisoning; inhalation can cause acute respiratory irritation, nose bleeding, hoarseness, contraction of the nasal mucosa, and sometimes asthma and cyanosis. Chemical pneumonia can occur in severe cases. Oral administration can irritate ...
Claims
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IPC IPC(8): C23C22/40
Inventor 赵丽虹李岩吴建文
Owner 沈阳宏迪科技有限公司