CN104762616A - Carbon steel surface anticorrosive cerium salt passivator and use method thereof - Google Patents
Carbon steel surface anticorrosive cerium salt passivator and use method thereof Download PDFInfo
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- CN104762616A CN104762616A CN201510178600.1A CN201510178600A CN104762616A CN 104762616 A CN104762616 A CN 104762616A CN 201510178600 A CN201510178600 A CN 201510178600A CN 104762616 A CN104762616 A CN 104762616A
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- cerium
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- anticorrosion
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- cerium salt
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Abstract
The invention discloses a carbon steel surface anticorrosive cerium salt passivator and a use method thereof. The preparation method of the carbon steel surface anticorrosive cerium salt passivator comprises the steps of: adding hydrogen peroxide with a volume percent of 3% and a mass percent of 30% in an aqueous solution of cerium nitrate with a solubility range of 500-5000ppm as an oxidant, then adjusting a pH value by using nitric acid with a mass percent of 65%, wherein the pH value ranges from 1 to 4; passivating for 2h by using a chemical immersion method at 30 DEG C, washing with water and then blow-drying by hot air, and drying. The carbon steel surface anticorrosive cerium salt passivator disclosed by the invention fundamentally eliminates the harms of hexavalent chromium and trivalent chromium elements in the traditional passivation solution to the environment and a human body, and is novel environment-friendly cerium salt passivation solution. Passivation process and equipment for the cerium salt passivation solution disclosed by the invention are equivalent to the traditional passivation process and equipment, and the existing equipment does not need to be transformed. The passivation process is simple, reliable, environment-friendly, simple to operate, low in cost, low in dosage, good in corrosion resistance, beautiful in appearance, and the like.
Description
Technical field
The present invention relates to anti-corrosion method, the anticorrosion Cerium passivating agent of especially a kind of steel surface and using method thereof.
Background technology
For C
r 6+and C
r 3+have carcinogenesis, serious harm human body and environment, current countries in the world have started to take measures strictly to limit C
r 6+and C
r 3+use, therefore, research novel non-chrome, environmental protection technique imperative.Cerium passivating treatment technology is the etch-proof important development direction of metal current, because of its there is environmental friendliness, simple to operate, cost is low, consumption is few, antiseptic property is good, the advantage such as specious, becomes a big hot topic of replacement chromium passivating traditional at present.
Summary of the invention
The object of the present invention is to provide the anticorrosion Cerium passivating agent of a kind of steel surface and using method thereof; utilize cerium salt as passivator; immersion treatment is carried out to metallic matrix, forms cerium oxide conversion film on its surface, play and reduce the provide protection such as corrosion current, isolation matrix.
The object of the present invention is achieved like this: the anticorrosion Cerium passivating agent of a kind of steel surface, is characterized in that: the component of described Cerium passivating agent is: Ce (NO
3)
36H
2o, nitric acid, hydrogen peroxide, water, it is in the aqueous solution of 500 ~ 5000ppm that the anticorrosion Cerium passivating agent of described steel surface adopts in the solubility scope of cerous nitrate, to add volume percent be 3% mass percent is that the hydrogen peroxide of 30% is as oxygenant, then functional quality percentage ratio is the nitric acid adjust ph of 65%, pH value range be 1 ~ 4 obtain.
A kind of passivating method using above-mentioned a kind of steel surface anticorrosion Cerium passivating agent process steel surface, it is characterized in that comprising the following steps: carry out mechanical grinding, middle temperature oil removing, running water, surface activation process, deionized water rinsing, dehydrated alcohol wiping to base material, chemical immersion method is selected to carry out passivation, use thermostat water bath, temperature controls at 30 DEG C, time is 2h, hot blast drying after washing, then dry under room temperature.
Preferably, the solubility scope of cerous nitrate is 500 ~ 1000ppm.
Preferably, pH value range is 2 ~ 3.
Preferably, described water is RO water.
The Cerium passivating liquid of the present invention's preparation, fundamentally eliminating the harm that sexavalent chrome in conventional passivation liquid and trivalent chromium element cause environment and human body, is a kind of novel environment friendly Cerium passivating liquid.The passivation technology of Cerium passivating liquid of the present invention, equipment and traditional passivation technology, equipment are suitable, without the need to transforming current device.Its passivation technology is simple, reliable, and environmental friendliness, simple to operate, cost is low, consumption is few, antiseptic property is good, the advantage such as specious.
Accompanying drawing explanation
Fig. 1 is under pH=3 condition described in a kind of anticorrosion Cerium passivating agent of steel surface of the present invention and using method thereof, the Nyquist figure of different ppm cerous nitrate concentration;
Fig. 2 is the Nyquist figure of blank group described in the anticorrosion Cerium passivating agent of a kind of steel surface of the present invention and using method thereof;
Fig. 3 is under 3000ppm cerous nitrate concentration conditions described in a kind of anticorrosion Cerium passivating agent of steel surface of the present invention and using method thereof, the Nyquist figure of different pH;
Fig. 4 is under pH=2 condition described in a kind of anticorrosion Cerium passivating agent of steel surface of the present invention and using method thereof, the Nyquist figure of different ppm cerous nitrate concentration.
Embodiment
Below in conjunction with embodiment, the present invention is further detailed.
The object of the present invention is achieved like this: the anticorrosion Cerium passivating agent of a kind of steel surface, is characterized in that: the component of described Cerium passivating agent is: Ce (NO
3)
36H
2o, nitric acid, hydrogen peroxide, water, it is in the aqueous solution of 500 ~ 5000ppm that the anticorrosion Cerium passivating agent of described steel surface adopts in the solubility scope of cerous nitrate, to add volume percent be 3% mass percent is that the hydrogen peroxide of 30% is as oxygenant, then functional quality percentage ratio is the nitric acid adjust ph of 65%, pH value range be 1 ~ 4 obtain.
A kind of passivating method using above-mentioned a kind of steel surface anticorrosion Cerium passivating agent process steel surface, it is characterized in that comprising the following steps: carry out mechanical grinding, middle temperature oil removing, running water, surface activation process, deionized water rinsing, dehydrated alcohol wiping to base material, chemical immersion method is selected to carry out passivation, use thermostat water bath, temperature controls at 30 DEG C, time is 2h, hot blast drying after washing, then dry under room temperature.
Preferably, the solubility scope of cerous nitrate is 500 ~ 1000ppm.
Preferably, pH value range is 2 ~ 3.
Preferably, described water is RO water.
A kind of anticorrosion Cerium passivating agent of steel surface of the present invention and using method tool thereof have the following advantages:
1. the advantages such as this passivating method has environmental friendliness, simple to operate, cost is low, consumption is few, antiseptic property is good, specious.
2. this passivating method parameter optimization detection method is simple, and Parameters variation all controls than being easier to.
3. the passivating method after optimizing can play good preservative activity to the surface of carbon steel steel plate.
Below in conjunction with embodiment, the present invention is described further, but the present invention is not limited only to following embodiment.
Embodiment 1:
Be respectively in the aqueous solution of 500ppm, 1000ppm, 3000ppm, 5000ppm in the solubility of cerous nitrate, to add volume percent be 3% mass percent is that the hydrogen peroxide of 30% is as oxygenant, then functional quality percentage ratio is the nitric acid adjust ph of 65%, and control ph is 3.Base material is the carbon steel steel plate of 150mm*75mm*1.2mm specification.Carry out mechanical grinding, middle temperature oil removing, surface activation process to base material, select chemical immersion method to carry out passivation, use thermostat water bath, temperature controls at 30 DEG C, and the time is 2h.Carry out cupric sulphate dropping test to above-mentioned four groups of samples, the situation of record passive film surface copper sulfate drop variable color, test-results is as table 1.By test-results, can see, under pH=3 condition, the passivation effect of 1000ppm, 3000ppm, 5000ppm cerous nitrate concentration has very large improvement than 500ppm.But the difference between three is little, we think after reaching certain concentration, cerous nitrate concentration on the impact of passivation effect limited.
The cupric sulphate dropping test Coloring Time of steel plate after the process of table 1 different cerous nitrate concentration
No. 0 experiment is after sanding and polishing but the cupric sulphate dropping test blank test test result of the carbon steel steel plate sample of unpassivated process.Contrast blank assay, can see, the corrosion resisting property through the sample of Passivation Treatment is greatly improved.
Embodiment 2:
Be in the aqueous solution of 3000ppm in the solubility scope of cerous nitrate, to add volume percent be 3% mass percent be the hydrogen peroxide of 30% as oxygenant, then functional quality percentage ratio is the nitric acid adjust ph of 65%, and pH value is respectively 1,2,3,4.Base material is the carbon steel steel plate of 150mm*75mm*1.2mm specification.Carry out mechanical grinding, middle temperature oil removing, surface activation process to base material, select chemical immersion method to carry out passivation, use thermostat water bath, temperature controls at 30 DEG C, and the time is 2h.Carry out cupric sulphate dropping test to above-mentioned four groups of samples, the situation of record passive film surface copper sulfate drop variable color, test-results is as table 2.By test-results, we can see, under 3000ppm cerous nitrate concentration conditions, the passivation effect of pH=2 larger improvement than pH=1, pH=3, pH=4, with the obvious advantage.
No. 0 experiment is after sanding and polishing but the cupric sulphate dropping test blank test test result of the carbon steel steel plate sample of unpassivated process.Contrast blank assay, can see, the corrosion resisting property through the sample of Passivation Treatment is greatly improved.
The cupric sulphate dropping test Coloring Time of the rear steel plate of process under the different pH of table 4
Embodiment 3:
Be respectively in the solubility of cerous nitrate: in the aqueous solution of 500ppm, 1000ppm, 3000ppm, 5000ppm, to add volume percent be 3% mass percent is that the hydrogen peroxide of 30% is as oxygenant, then functional quality percentage ratio is the nitric acid adjust ph of 65%, and pH value is 3.Carry out mechanical grinding, middle temperature oil removing, surface activation process to base material, select chemical immersion method to carry out passivation, use thermostat water bath, temperature controls at 30 DEG C, and the time is 2h.To the AC impedance of above-mentioned four groups of experimental subjects test surfaces passive films, result is as accompanying drawing 1.After sanding and polishing but the carbon steel steel plate sample alternating-current impedance of unpassivated process test blank test test result as accompanying drawing 2.
Comparison diagram 1 and Fig. 2, we can see with after sanding and polishing without compared with the carbon steel steel plate sample of surface preparation, process, the alternating-current impedance of the carbon steel steel plate after all passivation all has and significantly promotes, and illustrate that the corrosion current of sample sharply reduces, solidity to corrosion has very large lifting.This also illustrates cerium oxide conversion film and really serve sizable corrosion inhibition, there is certain application prospect.
Fig. 1 shows, and under pH=3 condition, passivation effect is not become better and better along with the increase of cerous nitrate concentration, and under 3000ppm cerous nitrate concentration conditions, passivation effect is best.
Embodiment 4:
Be in the aqueous solution of 3000ppm in the solubility of cerous nitrate, to add volume percent be 3% mass percent be the hydrogen peroxide of 30% as oxygenant, then functional quality percentage ratio is the nitric acid adjust ph of 65%, and pH value is respectively 1,2,3,4.Carry out mechanical grinding, middle temperature oil removing, surface activation process to base material, select chemical immersion method to carry out passivation, use thermostat water bath, temperature controls at 30 DEG C, and the time is 2h.Test the AC impedance of four groups of to be measured group of surface passivated membranes, result is as accompanying drawing 3.Test-results shows, and under pH=2 condition, passivation effect is best.Come to the same thing with cupric sulphate dropping test.
Embodiment 5:
Be respectively in the solubility of cerous nitrate: in the aqueous solution of 500ppm, 1000ppm, 3000ppm, 5000ppm, to add volume percent be 3% mass percent is that the hydrogen peroxide of 30% is as oxygenant, then functional quality percentage ratio is the nitric acid adjust ph of 65%, and pH value is 2.Carry out mechanical grinding, middle temperature oil removing, surface activation process to base material, select chemical immersion method to carry out passivation, use thermostat water bath, temperature controls at 30 DEG C, and the time is 2h.Test the AC impedance of four groups of subject surface passive films to be measured, result is as accompanying drawing 4.Test-results shows, under pH=2 condition, the passivation effect of 1000ppm cerous nitrate concentration is best.
Comparison diagram 1, under pH=2 condition, the passivation effect of 1000ppm cerous nitrate concentration is better than under pH=3 condition, the passivation effect of 3000ppm cerous nitrate concentration.
The foregoing is only the detailed description of specific embodiment of the invention scheme, do not limit the present invention with this, all do in mentality of designing of the present invention any amendment, equivalent to replace and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. the anticorrosion Cerium passivating agent of steel surface, is characterized in that: the component of described Cerium passivating agent is: Ce (NO
3)
36H
2o, nitric acid, hydrogen peroxide, water, it is in the aqueous solution of 500 ~ 5000ppm that the anticorrosion Cerium passivating agent of described steel surface adopts in the solubility scope of cerous nitrate, to add volume percent be 3% mass percent is that the hydrogen peroxide of 30% is as oxygenant, then functional quality percentage ratio is the nitric acid adjust ph of 65%, pH value range be 1 ~ 4 obtain.
2. one kind uses the passivating method of a kind of steel surface anticorrosion Cerium passivating agent process steel surface described in claim 1, it is characterized in that comprising the following steps: carry out mechanical grinding, middle temperature oil removing, running water, surface activation process, deionized water rinsing, dehydrated alcohol wiping to base material, chemical immersion method is selected to carry out passivation, use thermostat water bath, temperature controls at 30 DEG C, time is 2h, hot blast drying after washing, then dry under room temperature.
3. the anticorrosion Cerium passivating agent of a kind of steel surface according to claim 1, it is characterized in that preferred, the solubility scope of cerous nitrate is 500 ~ 1000ppm.
4. the anticorrosion Cerium passivating agent of a kind of steel surface according to claim 1, it is characterized in that preferred, pH value range is 2 ~ 3.
5. the anticorrosion Cerium passivating agent of a kind of steel surface according to claim 1, it is characterized in that preferred, described water is RO water.
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Cited By (5)
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| CN111286730A (en) * | 2020-03-21 | 2020-06-16 | 哈尔滨工程大学 | Steel bar surface self-compaction cerium-containing anticorrosive coating |
| CN112760630A (en) * | 2020-12-25 | 2021-05-07 | 瑞声科技（南京）有限公司 | Manufacturing method of heat dissipation device and heat dissipation device |
| CN114086189A (en) * | 2021-11-24 | 2022-02-25 | 宁波吉海金属科技有限公司 | Environment-friendly stainless steel pickling passivation solution |
| CN114134495A (en) * | 2021-09-13 | 2022-03-04 | 上海工程技术大学 | Method for recycling hexavalent chromium in metal passivation solution based on photocatalysis |
| CN114752926A (en) * | 2022-02-18 | 2022-07-15 | 航天科工防御技术研究试验中心 | Aluminum alloy surface corrosion-resistant treatment method |
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| CN114086189A (en) * | 2021-11-24 | 2022-02-25 | 宁波吉海金属科技有限公司 | Environment-friendly stainless steel pickling passivation solution |
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| CN114752926A (en) * | 2022-02-18 | 2022-07-15 | 航天科工防御技术研究试验中心 | Aluminum alloy surface corrosion-resistant treatment method |
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