CN109283129B - Electrode for monitoring atmospheric environment corrosion of carbon steel cold-rolled steel plate and monitoring method thereof - Google Patents
Electrode for monitoring atmospheric environment corrosion of carbon steel cold-rolled steel plate and monitoring method thereof Download PDFInfo
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- CN109283129B CN109283129B CN201710598622.2A CN201710598622A CN109283129B CN 109283129 B CN109283129 B CN 109283129B CN 201710598622 A CN201710598622 A CN 201710598622A CN 109283129 B CN109283129 B CN 109283129B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides an electrode for atmospheric environment corrosion monitoring of a carbon steel cold-rolled steel plate and a using method thereof. The invention has the following beneficial effects: the method can effectively reflect the corrosion tendency of the cold-rolled steel plate in the actual environment, thereby detecting and preventing the corrosion of the steel plate. In addition, the electrode can be made into a sheet shape, can be conveniently placed into a packaged steel coil, and monitors the corrosion defect in the steel coil, thereby providing a means and a method for preventing the corrosion of the steel coil in the long-time storage and marine transportation processes.
Description
Technical Field
The invention belongs to the technical field of electrochemical corrosion and protection, and particularly relates to an electrode for monitoring atmospheric environment corrosion of a common carbon steel cold-rolled steel plate and a using method thereof.
Background
When the atmospheric environment temperature and humidity reach a certain range, a thin liquid film can be formed on the surface of the steel plate, and a micro-battery is formed on the surface of the steel plate due to local electrochemical nonuniformity, so that an electrochemical corrosion reaction is generated, and the surface of the steel plate is corroded.
The common cold-rolled steel plate is not good in corrosion resistance and is easy to rust due to the fact that an effective protective layer is lacked on the surface, the steel plate is corroded to form defects, the surface quality of the steel plate is reduced, and the steel plate cannot be normally used. Therefore, the prevention of the corrosion of the cold rolled steel sheet is very important for steel mills and users. This patent is intended to provide an atmospheric environment corrosion monitoring electrode for monitoring ordinary cold steel sheet surface electrochemical corrosion current, through corrosion current's change judgement steel sheet corrosion risk and severity in atmospheric environment.
The literature and patent search show that there are some electrode sensors for atmospheric corrosion current monitoring. 201510383050.7 discloses an electrochemical sensor for monitoring atmospheric corrosivity and its application method, wherein the sensor is a double-electrode sensor made of metal material as electrode to form couple pair, and the atmospheric corrosivity is evaluated by monitoring electrode current. Cao Dong Long et al published a research paper about environmental sensitivity of Cu/Fe dual-electrode primary battery, and introduced the manufacturing and sensitivity influencing factors of Cu/Fe dual-electrode primary battery. However, the monitoring electrodes and methods disclosed in these patents or documents mainly aim at monitoring atmospheric corrosivity, and grade and classify the environmental corrosion level, and because different metal materials have different corrosion resistances, the magnitude or change of the monitored corrosion current cannot reflect the corrosion behavior and severity of a specific metal material. For example, by adopting a Cu/Fe double electrode for atmospheric corrosion current monitoring, the electrode current is very large in an indoor environment with damp heat in a rainy season, but stainless steel materials cannot be corroded under the environment, and common carbon steel cold-rolled steel plates are easy to corrode. Thus, existing methods and techniques have significant limitations in predicting corrosion of particular materials.
Disclosure of Invention
The invention provides a corrosion monitoring electrode and a using method thereof aiming at a common carbon steel cold-rolled steel plate which is easy to corrode in an atmospheric corrosion environment.
The invention is realized by the following technical scheme:
the utility model provides an electrode for monitoring of carbon steel cold-rolled steel sheet atmospheric environment corrosion, its includes insulation support, be equipped with a plurality of first pole pieces and a plurality of second pole pieces in the insulation support along radial interlude each other and parallelly, it has insulating resin to fill between first pole piece and the second pole piece, and the tip of first pole piece and the tip of second pole piece respectively are equipped with a wire, the wire passes insulation support's lateral wall and outwards extends.
Preferably, the thicknesses of the first pole piece and the second pole piece are both 0.5 mm.
Preferably, the material of the first pole piece is platinum, and preferably, the purity of the platinum is more than 99.9%
Preferably, the material of the second pole piece is interstitial-free steel.
Preferably, the interstitial free steel contains the following elements in percentage by weight:
C：0.001～0.006％；
Si：0～0.05％；
Mn：0.10～0.30％；
P：0.03～0.10％；
S：0.003～0.02％；
Ti：0.01～0.03％；
Nb：0.005～0.02％
fe: and (4) the balance.
Preferably, the distance between the first pole piece and the second pole piece is 0.25-0.50 mm.
The monitoring method of the electrode for atmospheric environment corrosion monitoring of the carbon steel cold-rolled steel plate comprises the following steps of:
s1: placing the electrode in an indoor environment with the temperature of 25 +/-1 ℃ and the relative humidity of 60%;
s2: connecting two wires in the electrode with a current detector, continuously measuring the corrosion current of the electrode for 1 hour to obtain the average value I of the corrosion current of the electrodea；
S3: the electrode and the monitored cold-rolled steel plate are placed under the same environmental condition for continuous monitoring, and if the electrode current I is more than 10 times IaThe steel sheet is relatively corroded severely under such an environment.
Compared with the prior art, the invention has the following beneficial effects:
since a general cold-rolled steel sheet has low corrosion resistance, it is easily corroded when stored in a hot and humid environment. One of the electrode materials used in the invention is representative IF steel, and the corrosion performance of the IF steel can reflect the corrosion behavior of most common carbon steel cold-rolled steel sheets. Therefore, the corrosion tendency of the cold-rolled steel plate under the actual environment can be effectively reflected by adopting the method, so that the corrosion of the steel plate can be detected and prevented. In addition, the electrode can be made into a sheet shape, can be conveniently placed into a packaged steel coil, and monitors the corrosion defect in the steel coil, thereby providing a means and a method for preventing the corrosion of the steel coil in the long-time storage and marine transportation processes.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural diagram of an electrode for atmospheric environmental corrosion monitoring of a carbon steel cold-rolled steel sheet in the invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 illustrates the magnitude and variation of the current in the laboratory environment;
FIG. 4 shows the result of monitoring 24h corrosion current of cold-rolled steel plates in a finishing workshop;
FIG. 5 shows the local corrosion of the cold rolled sheet;
in the figure: 1. an insulating sleeve; 2. a first pole piece; 3. a second pole piece; 4. an insulating resin; 5. and (4) conducting wires.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention relates to a structure of an electrode for atmospheric environment corrosion monitoring of a carbon steel cold-rolled steel plate, which is shown in figures 1 and 2 and comprises an insulating sleeve 1, wherein a plurality of first pole pieces 2 and a plurality of pole pieces 3 are arranged in the insulating sleeve 1 in a manner of mutually penetrating along the radial direction and in parallel, insulating resin 4 is filled between the first pole pieces 2 and the second pole pieces 3, the end part of the first pole piece 1 and the end part of the second pole piece 2 are respectively provided with a lead 5, and the two leads 5 both penetrate through the side wall of the insulating sleeve and extend outwards.
Examples
1) Selecting a Pt sheet with the purity of 99.9 percent and the thickness of 0.5mm and a cold-rolled B170P1 steel plate with the thickness of 0.5mm as electrodes, wherein the main components of the B170P1 steel plate are 0.002 percent of C, 0.051 percent of Si, 0.196 percent of Mn, 0.080 percent of P, 0.006 percent of S, 0.019 percent of Ti, 0.013 percent of Nb and the balance of iron;
2) cutting the Pt sheet and the B170P1 plate into electrode pieces with the width of 3mm, respectively serving as a first pole piece and a second pole piece, respectively, soldering one end of the Pt sheet and one end of the B170P1 plate by using copper wires with the diameter of 0.2mm, placing the Pt sheet and the B170P1 plate into acetone, ultrasonically cleaning the Pt sheet for 5 minutes, washing the Pt sheet by using alcohol, and then drying the cleaned Pt sheet by blowing. The Pt sheets and the B170P1 plates are alternately arranged at intervals of 0.25mm, and the lead wires are led out of the insulating sleeve. The insulating sleeve is 5mm in height and 25mm in diameter. Adopting transparent epoxy resin cold setting materials, uniformly stirring the materials according to the volume ratio of liquid to solid being 1.2:2, slowly pouring the materials into a sleeve, hardening the materials for more than 10 hours, confirming that no visible air bubbles exist between sheets under the irradiation of a flashlight, polishing the working surfaces of electrodes by adopting 400#, 600# and 1000# abrasive paper in sequence, and then drying the electrodes after washing the electrodes with alcohol;
3) placing the electrode in a laboratory with the temperature of 25 +/-1 ℃ and 60% RH, connecting two leads of the electrode with a measuring electrode of an electrochemical workstation, measuring a current-time curve, and measuring the average current Ia＝10.12nA。
4) The electrode was moved to a cold rolling finishing shop, placed about 1 meter away from the cold rolled sheet stack, two wires of the electrode were connected to the electrochemical workstation measurement electrode, and the current time curve was measured continuously, with the results shown in fig. 3. The current monitoring data change during 24h is shown in fig. 4. It can be seen from the graph that the current starts to increase rapidly after about 4 hours, which indicates that corrosion is accelerated and the risk of corrosion on the surface of the steel plate is increased. The rust spots detected on the surface of the cold-rolled steel sheet after 24 hours are shown in FIG. 5.
In summary, the present invention is only a preferred embodiment, and not intended to limit the scope of the invention, and all equivalent changes and modifications in the shape, structure, characteristics and spirit of the present invention described in the claims should be included in the scope of the present invention.
Claims (5)
1. The utility model provides an electrode for monitoring of carbon steel cold-rolled steel sheet atmospheric environment corrosion, a serial communication port, including insulation support, be equipped with a plurality of first pole pieces and a plurality of second pole pieces in the insulation support along radially interlude each other and parallelly, it has insulating resin to fill between first pole piece and the second pole piece, and the tip of first pole piece and the tip of second pole piece respectively are equipped with a wire, the wire passes insulation support's lateral wall and outwards extends, wherein, the material of second pole piece is interstitial free steel, contain the following element by weight percent in the interstitial free steel:
C：0.001～0.006％；
Si：0～0.05％；
Mn：0.10～0.30％；
P：0.03～0.10％；
S：0.003～0.02％；
Ti：0.01～0.03％；
Nb：0.005～0.02％
fe: and (4) the balance.
2. The electrode for atmospheric environmental corrosion monitoring of carbon steel cold rolled steel sheet of claim 1, wherein the first and second pole pieces are each 0.5mm thick.
3. The electrode for atmospheric environmental corrosion monitoring of carbon steel cold-rolled steel sheets according to claim 1 or 2, wherein the material of the first pole piece is platinum.
4. The electrode for atmospheric environmental corrosion monitoring of carbon steel cold-rolled steel plate of claim 1, wherein the distance between the first pole piece and the second pole piece is 0.25-0.50 mm.
5. The monitoring method of the electrode for atmospheric environmental corrosion monitoring of the carbon steel cold-rolled steel plate according to claim 1 is characterized by comprising the following steps of:
s1: placing the electrode in an indoor environment with the temperature of 25 +/-1 ℃ and the relative humidity of 60%;
s2: connecting two wires in the electrode with a current detector, continuously measuring the electrode corrosion current for 1 hour to obtain the electrode corrosion currentAverage value Ia；
S3: the electrode and the monitored cold-rolled steel plate are placed under the same environmental condition for continuous monitoring, and if the electrode current is more than 10 times IaThe steel sheet is relatively corroded severely under such an environment.
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| CN201710598622.2A CN109283129B (en) | 2017-07-21 | 2017-07-21 | Electrode for monitoring atmospheric environment corrosion of carbon steel cold-rolled steel plate and monitoring method thereof |
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| CN2047377U (en) * | 1989-05-20 | 1989-11-08 | 华东输油管理局 | Cell type gas corrosive probe |
| US4994159A (en) * | 1990-01-23 | 1991-02-19 | The United States Of America As Represented By The Secretary Of The Navy | Method and apparatus for measuring corrosion beneath thin films |
| CN1255677C (en) * | 2002-11-29 | 2006-05-10 | 宝山钢铁股份有限公司 | Electrochemical method for rapidly evaluating rustiness action of annealed cold-rolled plate |
| JP2008164467A (en) * | 2006-12-28 | 2008-07-17 | Ntn Corp | Corrosion environment sensor and sensor system |
| CN202916172U (en) * | 2012-11-05 | 2013-05-01 | 常洪雷 | Cement-based corrosion current sensor |
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