Surface passivation treating liquid for organic-inorganic composite metals
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A technology of composite metal surface and passivation treatment, applied in the field of metal material surface treatment, can solve problems such as performance gap, and achieve the effect of excellent corrosion resistance
Active Publication Date: 2008-11-19
JOMOO KITCHEN & BATHROOM
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However, there is still a certain gap between these products and the performance of chromate passivation film. They are still based on t...
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Embodiment 1
[0021] The main components of the organic and inorganic composite passivation solution in which manganate is the main inorganic salt are:
[0022] Potassium permanganate 6g
[0023] Dipotassium hydrogen phosphate 20g
[0024] Thiourea 5g
[0025] Phosphoric acid 5g
[0026] Waterborne Polyurethane 150g
[0027] Deionized water 750g
[0028] Curing agent (aliphatic polyisocyanate) 3g
[0029] 3 is a cross-sectional scanning electron micrograph of Example 1. It can be seen from Figure 3 that the thickness of the passivation film is about 2 μm.
Embodiment 2
[0031] The main components of the organic and inorganic composite passivation solution with titanium salt as the main inorganic salt are:
[0032] Titanyl Sulfate 5g
[0033] Ammonium Fluoride 20g
[0034] Fluorosilicate 30g
[0035] Thiourea 4g
[0036] Phosphoric acid 12g
[0037] Waterborne Polyurethane 150g
[0038] Deionized water 760g
[0039] Curing agent (aliphatic polyisocyanate) 3g
[0040] In order to have a more intuitive understanding of the passivation effect, a comparative experiment was carried out to compare with the galvanized sheet without passivation treatment and the galvanized sheet treated with low chromate passivation.
[0041] 1. The main components of low chromate passivation solution are:
[0042] Chromium trioxide 5g
[0043] Sulfuric acid 0.3g
[0044] Nitric acid 3g
[0045] Glacial acetic acid 5g
[0046] Deionized water 950g
[0047] Treatment conditions: pH value is 2, at room temperature Coating method: soak in passivation solution...
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Abstract
The invention relates to organic and inorganic composition metal surface passivation treatment liquid, which relates to passivation treatment for improving the corrosion resistance of the surface of a galvanized sheet. The compositions of the passivation treatment liquid are: 10 to 25 percent of film former, 0.1 to 2 percent of inorganic passivator, 0.02 to 0.2 percent of corrosion inhibitor, 0.5 to 5 percent of passivation solution stabilizer, and curing agent which is 1 to 5 percent of the weight of the organic film former. Compared with the prior art, the organic film former in the organic and inorganic composition metal surface passivation treatment liquid is taken as framework material to take effect; inorganic additives stand aloof from the reaction during the film forming process and are coated in an organic film; when the organic film is damaged, the inorganic additives generate secondary passivation effect through a wet liquid film on a breakage and generate the 'natural cure' function, thereby a passivating film with good corrosion resistance is obtained. The organic and inorganic composition metal surface passivation treatment liquid can completely replace chromate to realize preparation of the environment-friendly passivating film.
Description
technical field [0001] The invention relates to the surface treatment of metal materials, in particular to a passivation treatment for improving the corrosion resistance of the surface of a galvanized sheet. Background technique [0002] Galvanizing treatment is an effective method to improve the corrosion resistance of steel materials, but zinc is prone to corrosion in many environments, such as "white rust" in humid atmosphere, "pitting corrosion" in environment containing chloride ions, etc. Therefore, various zinc and zinc alloy products (including galvanized steel and galvanized parts, etc.) often require surface passivation treatment to further improve their corrosion resistance. In recent years, the most widely used method is chromate passivation treatment. The passivation process is simple, low in cost, and has good corrosion resistance. However, the chromate passivation solution contains hexavalent chromium, which is highly toxic and seriously pollutes the environme...
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