CN104562173A - Surface treatment method for improving corrosion resistance of 316L stainless steel in primary loop water of pressurized water reactor - Google Patents
Surface treatment method for improving corrosion resistance of 316L stainless steel in primary loop water of pressurized water reactor Download PDFInfo
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- CN104562173A CN104562173A CN201410823860.5A CN201410823860A CN104562173A CN 104562173 A CN104562173 A CN 104562173A CN 201410823860 A CN201410823860 A CN 201410823860A CN 104562173 A CN104562173 A CN 104562173A
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- Prior art keywords
- stainless steel
- surface treatment
- corrosion resistance
- treatment method
- water reactor
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/16—Polishing
- C25F3/22—Polishing of heavy metals
- C25F3/24—Polishing of heavy metals of iron or steel
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C21/00—Apparatus or processes specially adapted to the manufacture of reactors or parts thereof
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/08—Vessels characterised by the material; Selection of materials for pressure vessels
- G21C13/087—Metallic vessels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to a surface treatment method for improving the corrosion resistance of 316L stainless steel in primary loop water of a pressurized water reactor, and belongs to the technical field of surface treatment processes of metal materials. The surface treatment method comprises the following steps: polishing the 316L stainless steel with waterproof abrasive paper step by step sequentially; mechanically polishing the 316L stainless steel with diamond polishing paste; taking the 316L stainless steel as a positive electrode, taking a stainless steel sheet as a negative electrode, and controlling a potential difference between two polar plates to be 20-60 v at a temperature ranging from 0 DEG C to 20 DEG C; performing electrolytic polishing for 30 seconds to 200 seconds in a mixed solution of perchloric acid with the volume fraction of 5%-35% and glacial acetic acid, and obtaining the 316L stainless steel with relatively good corrosion resistance in the primary loop water of the pressurized water reactor.
Description
Technical field
The present invention relates to a kind of surface treatment method improving 316L stainless steel corrosion resistance nature in pressurized-water reactor primary Ioops water, belong to the process of surface treatment technical field of metallic substance.
Background technology
316L austenitic stainless steel has good over-all properties due to it, is widely applied to the structured material of Nuclear Power Industry reactor system.In pressurized-water reactor primary Ioops water medium environment, there is intergranular corrosion, stress corrosion crack, the hidden danger such as pitting attack, affect the safe operation of Nuclear power plants in Nuclear power plants structured material.Improve the corrosion resistance nature of material and can reduce the material failure caused because of corrosion, also can alleviate because the disadvantageous effect that corrosion causes ion to enter loop bringing occurs return.
Electropolishing (EP) treatment process, can reduce sample surfaces roughness, reduces the cold working impact on the nearly surface of sample.Lee and Lai research finds that electropolishing surface treatment is the very effective technique means of a kind of raising stainless material corrosion resisting property.Electropolishing process 316L austenitic stainless steel makes the fine and close rich chromium protective membrane of Surface Creation one deck, and forms equipotential surface, thus alleviates micro-cell corrosion.The main electrolytic polishing process reported at present mainly uses phosphoric acid and sulfuric acid mixed solution at 80 DEG C of electropolishings, then puts into 30 DEG C of water and soaks 20 min and carry out passivation, finally clean with water.Electropolishing stainless steel carries out to improve surfaceness a bit, also has and studies medical equipment solidity to corrosion in human body fluid environment, and does not further investigate its corrosion resisting property in pressurized-water reactor primary Ioops water.A lot of components such as primary Ioops and the secondary circuit cooling recirculation system of Nuclear Power Industry are all be on active service under high temperature and high pressure environment, in order to improve the service safety of 316L stainless material, the present invention proposes a kind of surface treatment method improving 316L stainless steel corrosion resistance nature in pressurized-water reactor primary Ioops water.
Summary of the invention
The object of the invention is the surface treatment method improving 316L stainless steel corrosion resistance nature in pressurized-water reactor primary Ioops water.
The object of the invention is to be realized by following technique means.
Improve a surface treatment method for 316L stainless steel corrosion resistance nature in pressurized-water reactor primary Ioops water, there is following processing step:
A. 316L stainless steel surface is polished step by step with waterproof abrasive paper successively;
B. mechanical polishing is carried out with diamond polishing cream;
C. at the temperature of 0 DEG C-20 DEG C, between positive and negative electrode two-plate, potential difference controls between 20 v-60 v, in perchloric acid volume fraction is the perchloric acid of 5%-35% and Glacial acetic acid mixing solutions, carry out electropolishing 30 s-200 s; The good 316L stainless steel of solidity to corrosion can be obtained.
The present invention is mainly for 316L stainless steel, sample after the process of different surface treatment mode is soaked 120 h in simulation pressurized-water reactor primary Ioops water, find still very bright through electropolishing surface-treated specimen surface, and the surface film of black through the whole surface coverage of sample of 600# waterproof abrasive paper process.Find that electropolishing changes the chemical composition of material surface by carrying out XPS depth profiling to its surface; improve the content of Ni element in the content of Cr element in surface film and the alloy layer on close surface, define the oxide film of thicker Cr, Ni element thus drastically increase solidity to corrosion.
Processing method of the present invention is applied to the final surface treatment of structural part that in some nuclear power systems, primary Ioops is correlated with, be can be implemented in by this technique and do not change matrix alloy composition, the condition of surface changing 316L stainless material by electropolishing improves the corrosion resistance nature of material.Material is through sand papering; in perchloric acid volume fraction is the perchloric acid of 5%-35% and Glacial acetic acid mixing solutions, electropolishing 30 s-200 s is carried out after mechanical polishing; the surface of light can be obtained; due to the selective dissolution of alloy; change the chemical composition on surface; improve the relative content of Cr, Ni, define the oxide film of Cr, Ni element, effectively improve solidity to corrosion.
Feature of the present invention is: the chemical composition being changed 316L surface of stainless steel by the surface treatment method of electropolishing, effectively improves the solidity to corrosion of 316L stainless material in the PWR of Nuclear Power Station environment of High Temperature High Pressure.
Accompanying drawing explanation
Fig. 1 is sample A surface topography after soaking 120 h in simulation pressurized-water reactor primary Ioops water;
Fig. 2 is sample B surface topography after soaking 120 h in simulation pressurized-water reactor primary Ioops water;
Fig. 3 is for after soaking 120 h in simulation pressurized-water reactor primary Ioops water, and a is the chemical composition that sample A surface XPS records, and b is the chemical composition that sample B surface XPS records.
Embodiment
After now embodiments of the invention being specifically described in.
embodiment 1
316L stainless steel is cut 5 mm × 3, mm × 12 mm samples along vertical forging direction, and the stainless chemical composition mass percent of 316L is: 66.5 Fe, 17.26 Cr, 12.28 Ni, 1.08 Mn, 0.092 Si, 0.026 C.Specimen surface obtains sample A after 600# liquid honing.Specimen surface is polished step by step with waterproof abrasive paper successively, then carries out mechanical polishing with diamond polishing cream, finally carries out electropolishing process and obtains sample B.
Electrolytic polishing process parameter: (1) temperature: 10 DEG C; (2) positive pole: 316L stainless steel, negative pole: stainless steel thin slice, potential difference between positive and negative polarities plate: 35 v; (3) polishing fluid: volume fraction is perchloric acid and the Glacial acetic acid mixing solutions of 1: 3; (4) the electropolishing time: 100 s.
A, B two kinds of samples are carried out immersion test in simulation PWR of Nuclear Power Station primary Ioops water.Soak test adopts the dynamic high temperature high pressure corrosion test system with recirculated water; Loop solution adopts LiOH and H
3bO
3preparation, design parameter is: 2 ppm Li
+, 1200 ppm B
3+, DO<5 ppb, DH:2.5 ppm, corrosive medium flow rate is 5 L/h, and experimental temperature is 310 DEG C, and pressure is 12.20 MPa, and soak time is 120 h.The change that XPS depth profiling observes its chemical composition is carried out to the sample after soaking.
Soak the A after 120 h, the surface topography of B two kinds of samples is respectively as Fig. 1, shown in 2, A sample surfaces is all covered with the surface film of one deck black, and B sample surfaces keeps the light before immersion substantially, there is a little point-like black surface film in surface, this may be because the uneven of electropolishing is caused.
The analysis of XPS depth profiling soaks the chemical composition on rear sample A surface as shown in Fig. 3 a, can the thickness of analytical table facial mask by O element variation trend, after sputtering 55 s, O constituent content just slightly declines, show that the surface film formed after sample A soaks is thicker, the analysis of XPS depth profiling soaks the chemical composition on rear sample B surface as shown in Fig. 3 b, when being splashed to 25 s, O constituent content has dropped to the half of initial value, show the thinner of the surface film formed after the sample B of process of the present invention soaks, the thickness of surface film effectively can be reduced by electropolishing process, solidity to corrosion is improved.
Claims (1)
1., at a kind of surface treatment method improving 316L stainless steel corrosion resistance nature in pressurized-water reactor primary Ioops water, the method has following processing step:
A. 316L stainless steel surface waterproof abrasive paper is polished step by step;
B. mechanical polishing is carried out with diamond polishing cream;
C. at the temperature of 0 DEG C-20 DEG C, with 316L stainless steel for positive pole, with stainless steel thin slice for negative pole, between control two-plate, potential difference is between 20 v-60 v, in the perchloric acid and Glacial acetic acid mixing solutions of perchloric acid volume fraction 5%-35%, carry out electropolishing 30 s-200 s, obtain the good 316L stainless steel of solidity to corrosion.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410823860.5A CN104562173A (en) | 2014-12-26 | 2014-12-26 | Surface treatment method for improving corrosion resistance of 316L stainless steel in primary loop water of pressurized water reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410823860.5A CN104562173A (en) | 2014-12-26 | 2014-12-26 | Surface treatment method for improving corrosion resistance of 316L stainless steel in primary loop water of pressurized water reactor |
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| Publication Number | Publication Date |
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| CN104562173A true CN104562173A (en) | 2015-04-29 |
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| CN201410823860.5A Pending CN104562173A (en) | 2014-12-26 | 2014-12-26 | Surface treatment method for improving corrosion resistance of 316L stainless steel in primary loop water of pressurized water reactor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911686A (en) * | 2015-06-04 | 2015-09-16 | 上海大学兴化特种不锈钢研究院 | Magnetic control surface treatment method for enhancing pitting corrosion resistance of 304L stainless steel |
| CN107761160A (en) * | 2017-10-11 | 2018-03-06 | 河钢股份有限公司 | A kind of electrolytic etching agent of high-strength invar microscopic structure and caustic solution |
| CN111551482A (en) * | 2020-05-15 | 2020-08-18 | 中国核动力研究设计院 | Comprehensive dynamic water corrosion test device with high-temperature and high-pressure one-loop and two-loop linkage operation |
-
2014
- 2014-12-26 CN CN201410823860.5A patent/CN104562173A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911686A (en) * | 2015-06-04 | 2015-09-16 | 上海大学兴化特种不锈钢研究院 | Magnetic control surface treatment method for enhancing pitting corrosion resistance of 304L stainless steel |
| CN107761160A (en) * | 2017-10-11 | 2018-03-06 | 河钢股份有限公司 | A kind of electrolytic etching agent of high-strength invar microscopic structure and caustic solution |
| CN107761160B (en) * | 2017-10-11 | 2019-04-05 | 河钢股份有限公司 | A kind of electrolytic etching agent of high-strength invar microscopic structure and caustic solution |
| CN111551482A (en) * | 2020-05-15 | 2020-08-18 | 中国核动力研究设计院 | Comprehensive dynamic water corrosion test device with high-temperature and high-pressure one-loop and two-loop linkage operation |
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