CN102183453A - Method for measuring potential of micro electrode of chlorine ion corrosion resistant anti-seismic steel - Google Patents
Method for measuring potential of micro electrode of chlorine ion corrosion resistant anti-seismic steel Download PDFInfo
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- CN102183453A CN102183453A CN201110025456XA CN201110025456A CN102183453A CN 102183453 A CN102183453 A CN 102183453A CN 201110025456X A CN201110025456X A CN 201110025456XA CN 201110025456 A CN201110025456 A CN 201110025456A CN 102183453 A CN102183453 A CN 102183453A
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Abstract
The invention relates to a method for measuring the potential of a micro electrode of a chlorine ion corrosion resistant anti-seismic steel, which comprises the steps of: (1) preparing a steel array micro electrode; (2) mixing cement, sand and water to prepare cement plaster, preparing concrete of 50*50mm, placing the array micro electrode at the center of a sample, demoulding, and maintaining at a room temperature to obtain a steel bar/concrete sample; and (3) immersing the sample in a NaCl solution for testing, measuring the distribution of the potential of the electrode at a regular time, and processing the data to obtain the potential of the electrode of a steel bar/concrete interface under different immersion time. The invention has the advantages of simple process and low cost, the inner link of a micro potential change process of a chlorine ion corrosion resistant anti-seismic steel system with a macro metal corrosion process is established, and the invention has an important significance in studying the corrosion mechanism of steel in concrete.
Description
Technical field
The invention belongs to the microscopic electrode current potential field of steel, particularly a kind of assay method of microscopic electrode current potential of anti-chlorine ion corrosion antidetonation steel.
Background technology
Along with the fast development of oceanographic engineering, ocean equipment manufacture and offshore engineering, people have higher requirement with the building bar for marine field.At first be the particular surroundings in the ocean, in marine environment and ocean climate, have a large amount of Korrosionsmedium chlorions.Chlorion is because activity is high, penetration capacity is extremely strong, for iron and steel, stainless steel and most of non-ferrous metal strong corrosivity effect is arranged, and seriously restricts structural metallic materials in maritime environmental applications.The infiltration of chlorion can greatly aggravate the corrosion of steel construction.Its mechanism is as follows: 1. the corrosion of steel: owing to the water that immerses, gas, chlorion etc., steel are corroded.Even not neutralisation, the phosphorous branch in steel top layer also can make steel corrode.2. the generation of crackle:, be that surperficial concrete cracks because steel are corroded, volumetric expansion.3. intensity reduces: corrosive deposit further immerses from cracks, quickens the burn into volumetric expansion of steel, thereby reduces concrete strength.In a word, corrosion can cause steel structure intensity to reduce, thus the serviceable life of reducing material greatly.
The direct loss that corrosion brings to human society are huge.Before and after the seventies in 20th century, many industrially developed country compare the corrosion investigation work of system in succession, and have delivered survey report.The result shows that the deterioration of corrosion accounts for 1% to 5% of national GNP.Current investigation is the harm that national governments pay close attention to corrosion, also important impetus has been played in the development of corrosion science.After this 30 in the period of, people are in the protection work of having carried out metal in varying degrees.Different time various countries have afterwards carried out investigation work in various degree again, and the damaed cordition of different times also is different.The data record is arranged, and the U.S.'s corrosion loss in 1975 is 82,000,000,000 dollars, accounts for 4.9% of total value of production in national economy; Nineteen ninety-five is 3,000 hundred million dollars, accounts for 4.21% of total value of production in national economy.The direct loss data that these data are just relevant with corrosion, the indirect loss data are difficult to add up sometimes, or even a surprising numeral.
Metal erosion has also caused the waste of the resource and the energy when causing economic loss, be unrenewable because equipment of being scrapped or member have small part, and the part that can also smelt regeneration again also can expend a large amount of energy in smelting process.Therefore resource and energy growing tension in the world be the problem of an economic loss not only by the problem that corrosion is brought at present.Corrosion also can cause catastrophic consequence sometimes to the destruction of metal, and example in this respect is too many, so be the selection of benefiting the nation and the people to the research of metal erosion.Because there has been deep understanding countries in the world for the harm of corrosion, therefore utilize various technology to carry out the research of metal erosion, through having obtained significant achievement for effort decades.
The research corrosion behavior of reinforcing bar, corrosion mechanism under the concrete coating in various media, excite wide spread interest and pay attention to, because concrete isolation and high-insulativity, conventional electrochemical techniques, microprobe scane technology all are difficult to measure under the immersion of corrosive medium, and concrete under the concrete coating/reinforcing bar interface particularly concrete of different depths/reinforcing bar phase boundary potential distributes.
Summary of the invention
Technical matters to be solved by this invention provides a kind of assay method of microscopic electrode current potential of anti-chlorine ion corrosion antidetonation steel, this method technology is simple, cost is low, established the inner link of anti-chlorine ion corrosion antidetonation steel system microcosmic potential change process and macroscopical metal erosion process, significant for the corrosion mechanism of further investigation steel in concrete.
The assay method of the microscopic electrode current potential of a kind of anti-chlorine ion corrosion antidetonation steel of the present invention comprises:
(1) with after the steel polishing, cleaning, applies the layer of surface film, then steel are arranged in array and mutually insulated, fix and fill the space with epoxy resin, steel array one end soldering copper lead is drawn, behind the other end polishing grinding, its xsect promptly gets the array microelectrode as workplace;
(2) cement, sand and water are mixed the system sand-cement slurry with mass ratio 1: 3: 0.5～1, be made into the concrete of 50 * 50mm, above-mentioned array microelectrode is placed the concrete center, thickness of concrete cover is 10～20mm, the demoulding after 24～36 hours, maintenance is 30～40 days under the room temperature, gets reinforcing bar/concrete sample;
(3) above-mentioned sample is immersed in 3.5～5wt%NaCI solution tests, with the saturated calomel electrode is contrast electrode, with the array microelectrode in the step (1) is working electrode, regularly measure the array electrode Potential distribution, obtain the electrode potential under the different soak times of reinforcing bar/concrete interface after data are handled.
Steel diameter in the described step (1) is 0.4～0.8mm, and material is Q235.
Steel in the described step (1) are arranged in array and are specially 16 steel are become array by 4 * 4 arranged.
Surface film in the described step (1) is a phenolics, and thickness is 200～300nm.
Cement in the described step (2) is portland cement, and sand is river sand, and river sand diameter is 0.1～1mm.
The present invention has studied corrosion of steel process in the array electrode technical modelling concrete, and measure its surface potential and distribute and change, follow the tracks of the generation evolution of steel surface corrosion behavior, at microcosmic angle precise quantification anti-chlorine ion corrosion antidetonation corrosion of steel failure procedure more, can establish the inner link of system micro interface process and macroscopical metal erosion process.
Beneficial effect
Technology of the present invention is simple, and cost is low, has established the inner link of anti-chlorine ion corrosion antidetonation steel system microcosmic potential change process and macroscopical metal erosion process, and is significant for the corrosion mechanism of further investigation steel in concrete.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiment 1
(1) steel of employing diameter 0.4mm, Q235 material, after polishing, cleaning, at the thin phenolics of surface-coated one deck, thickness is 200nm, then 16 carbon steel lines is pressed the tight arrangement of 4x4 matrix and is guaranteed mutually insulated, fixes and fill the space with epoxy resin.Electrode one end soldering copper lead is drawn, and behind the other end polishing grinding, it is transversal as workplace, and 16 working electrode mutually insulateds promptly make the array microelectrode.
(2) adopt Portland cement, fine aggregate is a river sand, diameter 1mm.Cement, sand, water ratio are that 1: 3: 0.5 mass ratio is mixed the system sand-cement slurry, are made into the cylindrical sample of 50 * 50mm, and the array microelectrode places the sample center, and thickness of concrete cover is 10mm.The demoulding after 24 hours, maintenance is 30 days under the room temperature.
(3) concrete sample that maintenance is good is immersed in and begins test in the 3.5wt%NaCI solution, with the saturated calomel electrode is contrast electrode, regularly measure the array electrode Potential distribution, by matlab software data are handled then, obtained reinforcing bar/concrete interface and be respectively 1 day, 10 days, 30 days, 60 current potentials all over the world in soak time.
Embodiment 2
(1) steel of employing diameter 0.8mm, Q235 material, after polishing, cleaning, at the thin phenolics of surface-coated one deck, thickness is 300nm, then 16 carbon steel lines is pressed the tight arrangement of 4x4 matrix and is guaranteed mutually insulated, fixes and fill the space with epoxy resin.Electrode one end soldering copper lead is drawn, and behind the other end polishing grinding, it is transversal as workplace, and 16 working electrode mutually insulateds promptly make the array microelectrode.
(2) adopt Portland cement, fine aggregate is a river sand, diameter 0.1mm.Cement, sand, water ratio are that 1: 3: 1 mass ratio is mixed the system sand-cement slurry, are made into the cylindrical sample of 50 * 50mm, and the array microelectrode places the sample center, and thickness of concrete cover is 20mm, the demoulding after 36 hours, and maintenance is 40 days under the room temperature.
(3) concrete sample that maintenance is good is immersed in and begins test in the 5wt%NaCI solution, with the saturated calomel electrode is contrast electrode, regularly measure the array electrode Potential distribution, by matlab software data are handled then, obtained reinforcing bar/concrete interface and be respectively 1 day, 10 days, 30 days, 60 current potentials all over the world in soak time.
Claims (5)
1. the assay method of the microscopic electrode current potential of anti-chlorine ion corrosion antidetonation steel comprises:
(1) with after the steel polishing, cleaning, applies the layer of surface film, then steel are arranged in array and mutually insulated, fix and fill the space with epoxy resin, steel array one end soldering copper lead is drawn, behind the other end polishing grinding, its xsect promptly gets the array microelectrode as workplace;
(2) cement, sand and water are mixed the system sand-cement slurry with mass ratio 1: 3: 0.5～1, be made into the concrete of 50 * 50mm, above-mentioned array microelectrode is placed the concrete center, thickness of concrete cover is 10～20mm, the demoulding after 24～36 hours, maintenance is 30～40 days under the room temperature, gets reinforcing bar/concrete sample;
(3) above-mentioned sample is immersed in 3.5～5wt%NaCI solution tests, with the saturated calomel electrode is contrast electrode, with the array microelectrode in the step (1) is working electrode, regularly measure the array electrode Potential distribution, obtain the electrode potential under the different soak times of reinforcing bar/concrete interface after data are handled.
2. the assay method of the microscopic electrode current potential of a kind of anti-chlorine ion corrosion antidetonation steel according to claim 1 is characterized in that: the steel diameter in the described step (1) is 0.4～0.8mm, and material is Q235.
3. the assay method of the microscopic electrode current potential of a kind of anti-chlorine ion corrosion antidetonation steel according to claim 1 is characterized in that: the steel in the described step (1) are arranged in array and are specially 16 steel are become array by 4 * 4 arranged.
4. the assay method of the microscopic electrode current potential of a kind of anti-chlorine ion corrosion antidetonation steel according to claim 1 is characterized in that: the surface film in the described step (1) is a phenolics, and thickness is 200～300nm.
5. the assay method of the microscopic electrode current potential of a kind of anti-chlorine ion corrosion antidetonation steel according to claim 1 is characterized in that: the cement in the described step (2) is portland cement, and sand is river sand, and river sand diameter is 0.1～1mm.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103524083A (en) * | 2013-09-22 | 2014-01-22 | 河海大学 | Cement-based mortar sensing electrode internally doped with nano-conductive material, as well as preparation method and application thereof |
| CN104458536A (en) * | 2014-12-16 | 2015-03-25 | 天津大学 | Device and method for measuring ion permeability of concrete, as well as application of device and method |
| CN104713820A (en) * | 2015-03-25 | 2015-06-17 | 天津大学 | Method for detecting corrosion state of metal in concrete |
| US20150198518A1 (en) * | 2014-01-16 | 2015-07-16 | Frank William Borin | Cathodic protection reference cell article and method |
| CN107655814A (en) * | 2017-11-15 | 2018-02-02 | 上海大学 | The high-flux detection method that alloying element influences for mild steel decay resistance |
| CN111307705A (en) * | 2018-12-11 | 2020-06-19 | 马自达汽车株式会社 | Corrosion resistance test method for clad metal material |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103524083A (en) * | 2013-09-22 | 2014-01-22 | 河海大学 | Cement-based mortar sensing electrode internally doped with nano-conductive material, as well as preparation method and application thereof |
| CN103524083B (en) * | 2013-09-22 | 2015-10-07 | 河海大学 | Cement-based mortar sensing electrode mixing nanometer conductive material in a kind of and preparation method thereof and application |
| US20150198518A1 (en) * | 2014-01-16 | 2015-07-16 | Frank William Borin | Cathodic protection reference cell article and method |
| CN104458536A (en) * | 2014-12-16 | 2015-03-25 | 天津大学 | Device and method for measuring ion permeability of concrete, as well as application of device and method |
| CN104713820A (en) * | 2015-03-25 | 2015-06-17 | 天津大学 | Method for detecting corrosion state of metal in concrete |
| CN107655814A (en) * | 2017-11-15 | 2018-02-02 | 上海大学 | The high-flux detection method that alloying element influences for mild steel decay resistance |
| CN107655814B (en) * | 2017-11-15 | 2019-11-19 | 上海大学 | The high-flux detection method that alloying element influences mild steel corrosion resistance |
| CN111307705A (en) * | 2018-12-11 | 2020-06-19 | 马自达汽车株式会社 | Corrosion resistance test method for clad metal material |
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Application publication date: 20110914 |