CN102864447A - Compound passivating fluid for mechanical zinc coating - Google Patents
Compound passivating fluid for mechanical zinc coating Download PDFInfo
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- CN102864447A CN102864447A CN2012103494748A CN201210349474A CN102864447A CN 102864447 A CN102864447 A CN 102864447A CN 2012103494748 A CN2012103494748 A CN 2012103494748A CN 201210349474 A CN201210349474 A CN 201210349474A CN 102864447 A CN102864447 A CN 102864447A
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Abstract
The invention belongs to the technical field of metal surface treatment and specifically relates to a compound passivating fluid for a mechanical zinc coating. The compound passivating fluid comprises a component A and a component B, wherein the component A is waterborne polyurethane, of which the weight percent is 8-18% in the compound passivating fluid; the component B is an inorganic passivator, of which the weight percent is 2.4-1.5% in the compound passivating fluid; and the balance is deionized water. The pH value of the compound passivating fluid is adjusted to 6-9 by using the sulfuric acid with the mass fraction of 98%. The compound passivating fluid has a better passivating function to a mechanical zinc coating workpiece; the environmental pollution caused by hexavalent chromium is avoided; a formed film is bright and transparent, is durable and excellent in flexibility, has a certain mechanical property, is excellent in water and chemical solvent resistance and is long in salt mist resisting time. The coating has the advantages of self-repairing function, high stability, low cost, simple preparation process and simple use method.
Description
Technical field
The invention belongs to field of metal surface treatment technology, specifically, relate to a kind of composite passivation solution for the treatment of mechanical galvanizing layer.
Background technology
Mechanical galvanizing layer mainly is be used to preventing atomospheric corrosion, with the protection steel part.But mechanical galvanizing layer suffers corrosion to form " white rust " and gloomy thing in damp-heat air easily, not only damages product appearance, and the position that is corroded also can be to horizontal and vertical continuous extension, and then the corrosion iron and steel parts, the generation iron rust.For improving the solidity to corrosion of mechanical galvanizing layer, the Passivation Treatment after must plating the mechanical zinc-plating workpiece.
Existing passivation technology generally adopts chromic salt and inorganic passivator to come mechanical galvanizing layer is carried out passivation.But the liquid waste disposal behind the employing chromating is very difficult, and contains poisonous sexavalent chrome in the waste liquid, and is very large to human body and environmental hazard.Although existing inorganic passivator does not contain chromium on the market, does not have chromic pollution problem, its film-formation result is relatively poor, poor stability, and passivation effect is bad.Promoting film forming, improving film-formation result although can add membrane-forming agent, membrane-forming agent expensive, and preparation technology is loaded down with trivial details, is unfavorable for promoting the use of of inorganic passivator.
Summary of the invention
For solving the problems of the technologies described above, the present invention proposes a kind of composite passivation solution for mechanical galvanizing layer, its film-formation result is good, stability is high, and cost of manufacture is low, preparation technology is simple.
Technical scheme of the present invention is: be used for the composite passivation solution of mechanical galvanizing layer, comprise component A and B component, component A is aqueous polyurethane, and its weight percent shared in described composite passivation solution is 8-18%; B component is inorganic passivator, and its weight percent shared in described composite passivation solution is 2.4-11.5%; Surplus is deionized water; The pH value of composite passivation solution is that 98% sulfuric acid is adjusted to 6-9 by massfraction.
Described inorganic passivator comprises following component, its in above-mentioned composite passivation solution separately shared weight percentage be respectively: Sodium orthomolybdate 1.0-3.0%, titanium sulfate 0.1-1.5%, water glass 0.1-1.5%, cerous nitrate 1.0-3.0%, benzotriazole 0.1-1.0%, phytic acid 0.1-1.5%.
Described aqueous polyurethane is the mixture of cation-type water-thinned polyurethane, anion-type water-thinned polyurethane, non-ion aqueous polyurethane, cation-type water-thinned polyurethane and non-ion aqueous polyurethane or the mixture of anion-type water-thinned polyurethane and non-ion aqueous polyurethane.
The present invention is with the main film forming substance of water-based organic polymer as composite passivation solution, add again inorganic passivator, it is crosslinked that passivator and organism are produced, and formation screen layer, the activated zinc layer is active, increase electroconductibility, make passive film have self-healing ability, effectively improved the resistance to corrosion of mechanical zinc-plating workpiece.
Its preparation method is: with after inorganic passivator mixes in water, be that 98% sulphur acid for adjusting pH value 6-9 between get final product with massfraction with aqueous polyurethane.
The passivation coated technique is as follows: at first the mechanical zinc-plating workpiece surface is cleaned up; hot-air seasoning; then passivating solution of the present invention is evenly coated on the mechanical zinc-plating workpiece of cleaning with methods such as dip-coating, spraying, roller coating; after the solution seasoning; namely generate the protective membrane that one deck has anti-" white rust " ability, oven dry also can.
Beneficial effect of the present invention is:
1, the present invention is better to the passivation of mechanical zinc-plating workpiece, jointly combine with metallic matrix by macromolecule polyurethane and inorganic inhibitor, can consist of fine and close screen layer, thereby strengthen the corrosion stability of film, can reach the requirement of mechanical zinc-plating workpiece corrosion resistance nature;
2, avoid sexavalent chrome to the pollution of environment;
3, have the film forming clear transparent, wear-resisting, flexibility good, has certain mechanical property, and water-fast, chemical solvent resistance can be good, and salt-fog resistant time is long, and rete has self-repair function, can carry out self-regeneration after scuffing or the water soaking drying, make rete keep the complete sum continuity;
4, the present invention stability is high, and stability of solution is up to 6 months;
5, with low cost, preparation technology is simple, and using method is simple.
Embodiment
Specify the present invention below in conjunction with embodiment.
Get uniform steel plate, be divided into 6, form mechanical galvanizing layer on its surface, respectively called after plate A, plate B, plate C, plate D, plate E and plate F.
Embodiment 1
1, raw material and the content of preparation composite passivation solution:
Cation-type water-thinned polyurethane 8g, Sodium orthomolybdate 3g, titanium sulfate 0.1g, water glass 1.5g, cerous nitrate 2.5g, benzotriazole 0.1g, phytic acid 1.5g, deionized water 83.3g.
2, the preparation method is: after above-mentioned raw materials was mixed, the functional quality mark was the pH value to 8 that 98% sulfuric acid is adjusted the aqueous solution.
Get plate A, carry out following test:
(1) content of 6-valence Cr ions detects
Carrying out the solubility content of 6-valence Cr ions according to GB/T 9758.5-1988 " mensuration the 5th part of paint and varnish " solubility " metal content: the mensuration diphenylcarbazone spectrophotometry of content of 6-valence Cr ions in the pigment part of liquid colored paint or the Powdered colored paint " detects.
(2) neutral salt spray corrosion test (NSS)
Adopt FQY025 type salt fog cabinet, according to GB/T 10125-1997 " artificial atmosphere corrosion test-salt-fog test ".Carry out artificial atmosphere salt air corrosion, produce the area evaluation anticorrosion effect of white rust with specimen surface.
(3) anti-solvent (80% ethanol and butanone) detects test
Carry out anti-solvent (80% ethanol and butanone) according to HG/T 3792-2005 " cross-linking type fluorine resin coating " and detect test, the wiping number of times is observed the variation of filming greater than 15 times.
(4) saline soak test
With 5wt%NaCl aqueous solution submergence sample under temperature (25 ± 2) ° C, the time of corrosion appears in the record sample.
(5) film resistance to elevated temperatures test
Carry out the thermotolerance test according to GB/T 1735-2009 " the stable on heating mensuration of paint and varnish ", sample is placed under baking oven (200 ± 2) ° C dry by the fire 30min, check that rete has or not the phenomenons such as variable color, aliquation, elephant skin, bubbling, cracking.
(6) resistance to boiling water test
Carry out resistance to boiling water test according to GB/T 1733-1993 " paint film water tolerance assay method ", sample is boiled 1h in 100 ° of C water, the visual observation whether variable color of filming.
Test-results sees the following form 1.
Embodiment 2
Outside lower difference, other are with embodiment 1.
1, raw material and the content of preparation composite passivation solution:
Anion-type water-thinned polyurethane 10g, Sodium orthomolybdate 2.5g, titanium sulfate 1.5g, water glass 0.1g, cerous nitrate 3g, benzotriazole 1g, phytic acid 0.1g, deionized water 81.8g.
2, the preparation method is: after above-mentioned raw materials was mixed, the functional quality mark was the pH value to 7 that 98% sulfuric acid is adjusted the aqueous solution.
Get plate B, carry out (1) described in above-described embodiment 1-(a 6) test, test-results sees the following form 1.
Embodiment 3
Outside lower difference, other are with embodiment 1.
1, raw material and the content of preparation composite passivation solution:
Cation-type water-thinned polyurethane 12g, Sodium orthomolybdate 2g, titanium sulfate 1g, water glass 1g, cerous nitrate 2g, benzotriazole 0.6g, phytic acid 1.2g, deionized water 80.2g.
2, the preparation method is: after above-mentioned raw materials was mixed, the functional quality mark was the pH value to 6 that 98% sulfuric acid is adjusted the aqueous solution.
Get plate C, carry out (1) described in above-described embodiment 1-(a 6) test, test-results sees the following form 1.Embodiment 4
Outside lower difference, other are with embodiment 1.
1, raw material and the content of preparation composite passivation solution:
Non-ion aqueous polyurethane 14g, Sodium orthomolybdate 2g, titanium sulfate 0.8g, water glass 0.8g, cerous nitrate 2g, benzotriazole 0.4g, phytic acid 1g, deionized water 79g.
2, the preparation method is: after above-mentioned raw materials was mixed, the functional quality mark was the pH value to 9 that 98% sulfuric acid is adjusted the aqueous solution.
Get plate D, carry out (1) described in above-described embodiment 1-(a 6) test, test-results sees the following form 1.
Embodiment 5
Outside lower difference, other are with embodiment 1.
1, raw material and the content of preparation composite passivation solution:
Cation-type water-thinned polyurethane 3g, non-ion aqueous polyurethane 13g, Sodium orthomolybdate 1g, titanium sulfate 1g, water glass 1g, cerous nitrate 1g, benzotriazole 0.4g, phytic acid 1g, deionized water 78.6g.
2, the preparation method is: after above-mentioned raw materials was mixed, the functional quality mark was the pH value to 7.5 that 98% sulfuric acid is adjusted the aqueous solution.
Get plate E, carry out (1) described in above-described embodiment 1-(a 6) test, test-results sees the following form 1.
Embodiment 6
Outside lower difference, other are with embodiment 1.
1, raw material and the content of preparation composite passivation solution:
Anion-type water-thinned polyurethane 13g, non-ion aqueous polyurethane 5g, Sodium orthomolybdate 1.5g, titanium sulfate 1g, water glass 1g, cerous nitrate 1.5g, benzotriazole 0.6g, phytic acid 1.2g, deionized water 75.2g.
2, the preparation method is: after above-mentioned raw materials was mixed, the functional quality mark was the pH value to 8.2 that 98% sulfuric acid is adjusted the aqueous solution.
Get plate F, carry out (1) described in above-described embodiment 1-(a 6) test, test-results sees the following form 1.
Table 1: embodiment 1-6 corrosion test assay
Can be learnt by upper table: the composite passivation solution that embodiment 1-6 makes, its erosion resistance in hygrothermal environment is better, and chemical solvent resistance is good, good film-forming property, salt-fog resistant time is long.
Claims (3)
1. a composite passivation solution that is used for mechanical galvanizing layer is characterized in that, comprises component A and B component,
Described component A is aqueous polyurethane, and its weight percent shared in described composite passivation solution is 8-18%;
Described B component is inorganic passivator, and its weight percent shared in described composite passivation solution is 2.4-11.5%;
Surplus is deionized water.
The pH value of described composite passivation solution is 6-9.
2. the composite passivation solution for mechanical galvanizing layer according to claim 1, it is characterized in that, described inorganic passivator comprises following component, its in described composite passivation solution separately shared weight percentage be respectively: Sodium orthomolybdate 1.0-3.0%, titanium sulfate 0.1-1.5%, water glass 0.1-1.5%, cerous nitrate 1.0-3.0%, benzotriazole 0.1-1.0%, phytic acid 0.1-1.5%.
3. the composite passivation solution for mechanical galvanizing layer according to claim 1 and 2, it is characterized in that, described aqueous polyurethane is wherein a kind of in cation-type water-thinned polyurethane, anion-type water-thinned polyurethane or the non-ion aqueous polyurethane, or the mixture of a kind of composition in non-ion aqueous polyurethane and cation-type water-thinned polyurethane or the anion-type water-thinned polyurethane.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210349474.8A CN102864447B (en) | 2012-09-19 | 2012-09-19 | Compound passivating fluid for mechanical zinc coating |
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| CN201210349474.8A CN102864447B (en) | 2012-09-19 | 2012-09-19 | Compound passivating fluid for mechanical zinc coating |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105951080A (en) * | 2016-06-27 | 2016-09-21 | 无锡伊佩克科技有限公司 | Composite passivant for aluminium alloy surface, and preparation method thereof |
| WO2019006622A1 (en) * | 2017-07-03 | 2019-01-10 | 深圳市宏昌发科技有限公司 | Passivator, metal workpiece and passivation process therefor |
| CN109957093A (en) * | 2019-03-26 | 2019-07-02 | 武汉迪赛环保新材料股份有限公司 | A kind of superhigh cross-linking degree aqueous polyurethane, a kind of galvanized sheet surface treatment liquid and preparation method thereof |
| CN111575690A (en) * | 2020-06-24 | 2020-08-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-dip galvanized aluminum-magnesium steel plate surface chromium-free passivation solution and preparation method of hot-dip galvanized aluminum-magnesium chromium-free passivation plate |
| CN114605854A (en) * | 2022-03-11 | 2022-06-10 | 旭贞新能源科技(上海)有限公司 | Anticorrosive coating with super hydrophobic performance and ultralow surface energy |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105951080A (en) * | 2016-06-27 | 2016-09-21 | 无锡伊佩克科技有限公司 | Composite passivant for aluminium alloy surface, and preparation method thereof |
| CN105951080B (en) * | 2016-06-27 | 2018-11-20 | 力同铝业（广东）有限公司 | Aluminum alloy surface composite passivant and preparation method thereof |
| WO2019006622A1 (en) * | 2017-07-03 | 2019-01-10 | 深圳市宏昌发科技有限公司 | Passivator, metal workpiece and passivation process therefor |
| CN109957093A (en) * | 2019-03-26 | 2019-07-02 | 武汉迪赛环保新材料股份有限公司 | A kind of superhigh cross-linking degree aqueous polyurethane, a kind of galvanized sheet surface treatment liquid and preparation method thereof |
| CN109957093B (en) * | 2019-03-26 | 2021-12-14 | 武汉迪赛环保新材料股份有限公司 | Ultrahigh-crosslinking-degree waterborne polyurethane, galvanized sheet surface treatment liquid and preparation method thereof |
| CN111575690A (en) * | 2020-06-24 | 2020-08-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-dip galvanized aluminum-magnesium steel plate surface chromium-free passivation solution and preparation method of hot-dip galvanized aluminum-magnesium chromium-free passivation plate |
| CN114605854A (en) * | 2022-03-11 | 2022-06-10 | 旭贞新能源科技(上海)有限公司 | Anticorrosive coating with super hydrophobic performance and ultralow surface energy |
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