CN104233269A - Stainless steel passivation solution for food processing - Google Patents
Stainless steel passivation solution for food processing Download PDFInfo
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- CN104233269A CN104233269A CN201310256602.9A CN201310256602A CN104233269A CN 104233269 A CN104233269 A CN 104233269A CN 201310256602 A CN201310256602 A CN 201310256602A CN 104233269 A CN104233269 A CN 104233269A
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- stainless steel
- passivating solution
- passivation solution
- food processing
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Abstract
The invention discloses a stainless steel passivation solution for food processing. The passivation solution is composed of the following components in percentage by weight: 18-20% of nitric acid, 5-7% of ammonium nitrate, 4-6% of ferrous sulfate, 2-4% of sodium carbonate, 0.5-1.5% of cerous sulfate, 2-4% of sodium citrate and the balance being water. The passivation solution disclosed by the invention is free from such toxic and harmful substances as chromium, fluorine, chlorine and nitrite and is environmentally friendly, and is applicable to stainless steel passivation for food processing. The passivation solution disclosed by the invention, which is free from hydrogen peroxide, and is stable, and avoids a problem of stabilizing the hydrogen peroxide by adding an additive.
Description
Technical field
The present invention relates to technical field of surface, particularly relate to the stainless passivating solution of a kind of food-processing.
Background technology
In recent years, along with the development of technology, the mechanical component that food-processing industry more and more adopts stainless steel to make to process and splendid attire vessel, this stainless steel is generally austenitic stainless steel.Austenitic stainless steel has good corrosion resistance nature, high temperature oxidation resistance, cryogenic mechanics performance, excellent machining property and outward appearance is elegance preferably.The iron pollution on austenitic stainless steel surface is a kind of very general phenomenon, iron pollution destroys the integrity of surface passivated membrane, the surface of stainless steel that there is iron pollution there will be yellow rust staining or rust spot, not only destroy the aesthetic appearance of material, and adverse influence is produced to the corrosion resistance nature of material and other performance.In austenitic stainless steel parts machining, thermal treatment, assembling and storage and transport process, manufacturing environment, cutter and frock clamp etc. may cause iron pollution at stainless steel surface.
Stainless acid wash passivation is the effective ways removing iron pollution.The series of physical chemical reaction that acid wash passivation can be occurred by stainless steel and acid wash passivation liquid, and then the rich Cr oxide film generating one deck densification at stainless steel surface.Under the condition of not being strict with stainless steel solidity to corrosion and surface clearness, current most of acid wash passivation liquid is all applicable to the removing that austenitic stainless steel Surface Fe pollutes.But, at the austenitic steel that food-processing industry is used, do not allowed the poisonous and harmful elements such as chromium, fluorine, chlorine.Because of undesirable containing harmful elements such as too much chlorion, fluorions in major part acid wash passivation liquid.
In the salpeter solution of acidity, add hydrogen peroxide be strengthening pickling passivation effect and the effective ways reducing nitric acid usage quantity.Such as, patent CN1212423C discloses and is a kind ofly applicable to natural gas liquids, the acid wash passivation cream of nuclear power engineering and preparation method, adopts nitric acid, phosphoric acid, hydrogen peroxide, zinc phosphate and magnesium nitrate to be configured to acid wash passivation cream.Hydrogen peroxide easily decomposes in alkaline medium, when pH value Absorbable organic halogens existence within the specific limits in acidic medium; Therefore the passivating solution containing hydrogen peroxide can, because of the instability of hydrogen peroxide, make the repeating utilization factor of passivating agent for acid-washing not high usually.Although can suppress the decomposition of hydrogen peroxide by adding stablizer, the interpolation of stablizer can reduce passivation effect on the one hand; Traditional stabilizer of hydrogen peroxide can produce with the iron ion complexing of dissolving during Cleaning and Passivation stainless steel and precipitate on the other hand, and then loses stabilization function; Simultaneous Stabilization agent is expensive, makes Cleaning and Passivation liquid high cost.
Summary of the invention
The object of the invention is to propose the stainless passivating solution of a kind of food-processing, this passivating solution not containing hazardous and noxious substances, and does not contain hydrogen peroxide, thus overcomes the defect of prior art, and the passive film erosion resistance of preparation is high, and performance is good.
For reaching this object, the present invention by the following technical solutions:
The stainless passivating solution of a kind of food-processing, this passivating solution is made up of following component by weight percentage: nitric acid 18-20%, ammonium nitrate 5-7%, ferrous sulfate 4-6%, sodium carbonate 2-4%, cerous sulfate 0.5-1.5%, Trisodium Citrate 2-4%, and surplus is water.
Preferably, this passivating solution is made up of following component by weight percentage: nitric acid 18.5-19.5%, ammonium nitrate 5.5-6.5%, ferrous sulfate 4.5-5.5%, sodium carbonate 2.5-3.5%, cerous sulfate 0.8-1.2%, Trisodium Citrate 2.5-3.5%, and surplus is water.
Most preferably, this passivating solution is made up of following component by weight percentage: nitric acid 19.0%, ammonium nitrate 6.0%, ferrous sulfate 5.0%, sodium carbonate 3.0%, cerous sulfate 1.0%, Trisodium Citrate 3.0%, and surplus is water.
The present invention has following beneficial effect:
1) hazardous and noxious substances such as chromium, fluorine, chlorine, nitrite are not contained in passivating solution of the present invention, environmentally friendly, and be suitable for the stainless passivation of food-processing.
2) passivating solution of the present invention is not containing hydrogen peroxide, and therefore passivating solution is stablized, and there is not the problem of adding additive Stabilizing Hydrogen Peroxide.
3) good passivation effect of passivating solution of the present invention, erosion resistance is strong.
Embodiment
Embodiment one
The stainless passivating solution of a kind of food-processing, this passivating solution is made up of following component by weight percentage: nitric acid 18%, ammonium nitrate 7%, ferrous sulfate 4%, sodium carbonate 4%, cerous sulfate 0.5%, Trisodium Citrate 4%, and surplus is water.
Embodiment two
The stainless passivating solution of a kind of food-processing, this passivating solution is made up of following component by weight percentage: nitric acid 20%, ammonium nitrate 5%, ferrous sulfate 6%, sodium carbonate 2%, cerous sulfate 1.5%, Trisodium Citrate 2%, and surplus is water.
Embodiment three
The stainless passivating solution of a kind of food-processing, this passivating solution is made up of following component by weight percentage: nitric acid 18.5%, ammonium nitrate 6.5%, ferrous sulfate 4.5%, sodium carbonate 3.5%, cerous sulfate 0.8%, Trisodium Citrate 3.5%, and surplus is water.
Embodiment four
The stainless passivating solution of a kind of food-processing, this passivating solution is made up of following component by weight percentage: nitric acid 19.5%, ammonium nitrate 5.5%, ferrous sulfate 5.5%, sodium carbonate 2.5%, cerous sulfate 1.2%, Trisodium Citrate 2.5%, and surplus is water.
Embodiment five
The stainless passivating solution of a kind of food-processing, this passivating solution is made up of following component by weight percentage: nitric acid 19%, ammonium nitrate 6%, ferrous sulfate 5%, sodium carbonate 3%, cerous sulfate 1.0%, Trisodium Citrate 3%, and surplus is water.
Claims (3)
1. the stainless passivating solution of food-processing, is characterized in that, this passivating solution is made up of following component by weight percentage: nitric acid 18-20%, ammonium nitrate 5-7%, ferrous sulfate 4-6%, sodium carbonate 2-4%, cerous sulfate 0.5-1.5%, Trisodium Citrate 2-4%, surplus is water.
2. the stainless passivating solution of a kind of food-processing as claimed in claim 1, it is characterized in that, this passivating solution is made up of following component by weight percentage: nitric acid 18.5-19.5%, ammonium nitrate 5.5-6.5%, ferrous sulfate 4.5-5.5%, sodium carbonate 2.5-3.5%, cerous sulfate 0.8-1.2%, Trisodium Citrate 2.5-3.5%, surplus is water.
3. the stainless passivating solution of a kind of food-processing as claimed in claim 2, it is characterized in that, this passivating solution is made up of following component by weight percentage: nitric acid 19.0%, ammonium nitrate 6.0%, ferrous sulfate 5.0%, sodium carbonate 3.0%, cerous sulfate 1.0%, Trisodium Citrate 3.0%, surplus is water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310256602.9A CN104233269A (en) | 2013-06-24 | 2013-06-24 | Stainless steel passivation solution for food processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310256602.9A CN104233269A (en) | 2013-06-24 | 2013-06-24 | Stainless steel passivation solution for food processing |
Publications (1)
| Publication Number | Publication Date |
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| CN104233269A true CN104233269A (en) | 2014-12-24 |
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| CN201310256602.9A Pending CN104233269A (en) | 2013-06-24 | 2013-06-24 | Stainless steel passivation solution for food processing |
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- 2013-06-24 CN CN201310256602.9A patent/CN104233269A/en active Pending
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Application publication date: 20141224 |