CN113484229A - Metal corrosion state evaluation device and method under simulated marine multi-parameter condition - Google Patents
Metal corrosion state evaluation device and method under simulated marine multi-parameter condition Download PDFInfo
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- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- G—PHYSICS
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
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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
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
Abstract
The invention discloses a device and a method for evaluating the corrosion state of a metal part under the condition of simulating ocean multiparameters, wherein the device for evaluating the corrosion state comprises an inner reservoir and an outer reservoir, the inner reservoir is arranged in the middle of the inner part of the outer reservoir in a nested manner, the inner reservoir and the outer reservoir can form circular ecological seawater flow, the technical problem that an ocean corrosion experiment cannot be carried out in a laboratory without an ocean environment is solved, the evaluation method is used for measuring the corrosion rate by using a monitoring method based on an image processing method, the obtained image is identified by utilizing the Otsu method and the regional growth, the area of a corrosion region is obtained according to the total pixel number of the image, the change value of the corrosion area is corresponding to the corrosion rate measured by a linear polarization method, and the corrosion rate is rapidly determined by monitoring the real-time image. The invention fully considers the comprehensive influence of the actual marine environment on the material corrosion, and has the advantages of real experimental data, short experimental period, high efficiency, simple structure and convenient use.
Description
Technical Field
The invention relates to the field of marine corrosion experiments, in particular to a device and a method for evaluating metal corrosion state under a simulated marine multi-parameter condition.
Background
The ocean occupies more than 2/3 of the surface of the ball, and extremely abundant mineral resources are stored. With the rise of the emerging marine industries such as marine transportation, deep sea mining, ports and docks, oil and gas development, marine biotechnology and the like, the development and utilization of oceans by human beings gradually go deep, and the scale of oceans is continuously enlarged. However, the marine environment is a very corrosive disaster environment, and various materials are very easy to corrode, deteriorate and destroy in the marine environment. Losses due to corrosion include direct and indirect losses, which are an invisibly ongoing destruction, and the direct economic losses due to corrosion in countries of the world account for about 2% -4% of the total production of their nations each year, with the loss due to marine corrosion accounting for about 1/3% of the total corrosion.
The marine environment relates to complex factors in multiple fields such as weather, fluid, physics, chemistry and biology. The traditional metal material can not meet the use conditions of advanced marine equipment and machinery gradually, so that the improvement of the traditional marine material is extremely important for designing a new material with high performance, corrosion resistance, environmental protection and green aiming at the marine environment and deeply exploring the applicability of the new material. At present, the best research method for carrying out the marine environment anticorrosion and scale inhibition experiment is a field exposure experiment in the actual marine environment, because the anticorrosion and scale inhibition performance of the material can be really and accurately measured, but the experiment has long period and high cost, and a large amount of experiment data is difficult to obtain in a short time.
In the marine ecological environment, animals, plants and microorganisms are various and large in quantity. The cause of corrosion is complicated, and pitting corrosion, stress corrosion, crevice corrosion, and the like exist. Pitting is considered to be the most prominent corrosion feature in a number of corrosion categories. Pitting corrosion is also known as pitting corrosion and pitting corrosion. The size of the pitting is large, and the depth of the pitting is generally much larger than the diameter of the pitting. Pitting corrosion often occurs on metals having a passivation or protective film on the surface. Due to the heterogeneity of defects, impurities, solutes, etc. in the metal material, especially the large amount of chloride ions contained in the marine environment, these chloride ions are first adsorbed at certain points on the surface of the metal material, thereby causing the destruction of the passivation film on the metal surface. Corrosion of the metal surface occurs once the passivation film is damaged and lacks self-passivation capabilities. This is because the substrate is easily leaked from the defect of the metal surface to make it in an activated state, and the passive film is still in a passive state, so that an active-passive corrosion cell is formed.
The existing corrosion online detection technology comprises a corrosion coupon method, an electrochemical noise technology and the like. However, the coupon method needs to perform weightlessness calculation analysis after the experiment is completed to calculate the corrosion rate, which not only consumes time, but also has large error of the experimental result. Electrochemical methods have the disadvantage that the sample processing is critical, since the sensitivity is dependent on the cross-section of the sample. The thinner and thinner the sample, the higher the sensitivity, the longer the time required for the measurement of the low corrosion rate system, and the larger the error if used in the case of non-uniform corrosion, the larger the time required for the measurement of the local corrosion characteristics, and the measured corrosion rate deviates with the increase of the non-uniformity. Although the electrochemical noise technology has simple measuring device, does not need external disturbance, has no interference on a measured system, can analyze by adopting a mathematical method, and reflects the real corrosion condition of the material, the relationship between a chemical signal and a corrosion metal electrode of the metal corrosion technology has not established a complete test system so far because the electrical state of the metal corrosion technology fluctuates randomly in the metal corrosion process, and therefore, the monitoring and the research on the metal corrosion are not facilitated. Therefore, how to solve the above problems is the direction of research by those skilled in the art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a device and a method for evaluating the metal corrosion state under the condition of simulating ocean multi-parameter, so as to solve the problems in the technical background.
The purpose of the invention is realized by the following technical scheme:
a device for evaluating metal corrosion state under the condition of simulating ocean multi-parameter comprises a PH salinity adjusting tank, an outer water storage tank and an inner water storage tank fixedly arranged in the outer water storage tank through a support, wherein a containing cavity is arranged between the inner water storage tank and the outer water storage tank, a water inlet is arranged on the containing cavity, the PH salinity adjusting tank is communicated with the water inlet through a water conveying pipeline, a filtering device and a water suction pump are further arranged in the containing cavity, the water suction pump is communicated with the inner water storage tank through a water pipe and a water outlet, a box cover is arranged above the outer water storage tank, a halogen tungsten lamp source is arranged on the sealing cover, an experimental sample table is fixedly arranged at the bottom of the inner water storage tank, the experimental sample table is electrically connected with a corrosion speed measuring instrument through a probe, a camera is arranged above the experimental sample table, the corrosion speed measuring instrument is electrically connected with an upper computer, and the inner water storage tank is connected with an oxygen supply device through a hose, the side wall of the inner reservoir is provided with a heating device, a temperature sensor and a flow guide hole, and the bottom of the outer reservoir is also provided with a water outlet and a water discharge pipe respectively.
Furthermore, the experiment sample platform includes the fixed experiment sample base of fixed setting at interior cistern bottom and sets up and be in fixed experiment sample frame outside the fixed experiment sample base.
Further, the support includes first support and the second support of symmetry setting in the outer cistern left and right sides.
Further, the drain pipe is including setting up first drain pipe and the second drain pipe in outer cistern bottom left and right sides, be equipped with first valve and second valve on first drain pipe and the second drain pipe respectively.
Furthermore, a third valve is arranged on the water conveying pipeline.
Further, the heating device comprises a first heating device and a second heating device which are arranged on the inner walls of the left side and the right side of the inner reservoir.
Furthermore, the camera is arranged above the left side of the experimental sample table through a support rod, and the support rod is a telescopic support rod.
Furthermore, the surface of the box sealing cover is provided with a first heat preservation layer, and the outer wall of the inner reservoir is provided with a second heat preservation layer.
Furthermore, a flow meter is arranged on the water pipe.
An evaluation method of a device for simulating metal corrosion state under marine multi-parameter conditions comprises the following steps:
s1, placing a sample: fixedly mounting a sample on an experimental sample table;
s2, configuring ecological seawater in the PH salinity regulating pond, and injecting the ecological seawater into the accommodating cavity;
s3, seawater circulation: ecological seawater is injected into the inner reservoir through the water suction pump, the ecological seawater is discharged into the accommodating cavity through the flow guide port, seawater circulation is simulated, and the power of the water suction pump is matched with the number and the flow velocity of the flow guide holes, so that the required water flow velocity is controlled;
s4, adjusting the temperature required by different tests by the ecological seawater through a heating device and a temperature sensor; starting an oxygen supply device to supply oxygen to the test environment;
s5, opening a halogen tungsten lamp source on the inner wall of the sealing box cover to irradiate the ecological seawater by simulating natural light;
s6, adding sulfate reducing bacteria, algae, shellfish and arthropods into the inner reservoir to simulate the marine environment of ecological seawater;
s7, shooting a corrosion picture on the surface of the sample by using a camera, and shooting the complete corrosion condition on the surface of the experimental sample at a fixed angle and distance of 24h at intervals during shooting so that the sample is opposite to a lens and the whole picture is occupied;
s8, measuring the corrosion rate and the area of the obtained picture stain each time by using an image recognition and linear polarization method, obtaining the area change value of the result, corresponding the area change value of the corrosion to the corrosion rate, calibrating the relation between the corrosion area change rate and the corrosion rate, and rapidly measuring the corrosion rate through real-time image monitoring.
The invention has the beneficial effects that: the device provided by the invention constructs a seawater circulating system by using a nested structure of a water pump, a flow guide hole and an inner reservoir and an outer reservoir, the inner reservoir and the outer reservoir form a circulating ecological seawater flow, a camera is used for observing the test progress in real time, the corrosion research on a metal sample can be realized indoors, the metal sample can be prevented from going to and fro between a laboratory and the sea edge, the corrosion appearance and the corrosion state of the surface of the test sample can be observed and analyzed in time, secondly, a halogen tungsten lamp source is used for simulating the illumination of the sea, a heating device and a temperature sensor are used for simulating the real sea environment temperature, the corrosion appearance and the corrosion state of the surface of a test sample plate can be analyzed in time, furthermore, the corrosion rate is measured by using a monitoring method based on an image processing method, the obtained image is identified by using the Otsu method and the regional growth, according to the total pixel number of the image, the method has the advantages that the comprehensive influence of the actual marine environment on the material corrosion is fully considered, and the method has the advantages of real experimental data, short experimental period, high efficiency, simple structure and convenience in use.
Drawings
FIG. 1 is a schematic structural diagram of a metal corrosion state evaluation device under a simulated marine multi-parameter condition according to the present invention;
FIG. 2 is a flow chart of the method for evaluating the metal corrosion state under the simulated marine multi-parameter condition according to the present invention.
In the figure, 1-a sealing cover, 2-a water inlet, 3-a PH salinity adjusting pond, 4-a third valve, 5-a water conveying pipeline, 6-an outer reservoir, 7-a diversion hole, 8-a temperature sensor, 9-a second insulating layer, 10-a second heating device, 11-an inner reservoir, 12-a hose, 13-an oxygen supply device, 14-a second valve, 15-a second drain pipe and 16-a water outlet. 17-a second support, 18-a fixed experiment sample frame, 19-a metal sample, 20-a filtering device, 21-a fixed experiment sample base, 22-a first support, 23-a first drainage pipe, 24-a water pump, 25-a first valve, 26-a first heating device, 27-a water outlet, 28-a water pipe, 29-a flow rate meter, 30-an upper computer, 31-a corrosion speed measuring instrument, 32-a probe, 33-a support rod, 34-a camera, 35-a first heat preservation layer, 36-ecological seawater and 37-a halogen tungsten lamp source.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Example 1:
an evaluation device for metal corrosion state under simulated ocean multi-parameter condition, please refer to the attached figure 1, which comprises a PH salinity adjusting tank 3, an outer water storage tank 6 and an inner water storage tank 11 fixedly arranged in the outer water storage tank 6 through a bracket, wherein a containing cavity is arranged between the inner water storage tank 11 and the outer water storage tank 6, a water inlet 2 is arranged on the containing cavity, the PH salinity adjusting tank 3 is communicated with the water inlet 2 through a water pipeline 5, a filtering device 20 and a water pump 24 are also arranged in the containing cavity, the water pump 24 is communicated with the inner water storage tank 11 through a water pipe 28 and a water outlet 27, a box cover 1 is arranged above the outer water storage tank 6, a halogen tungsten lamp source 37 is arranged on the box cover 1, an experimental sample table is fixedly arranged at the bottom of the inner water storage tank 11, specifically, the experimental sample table comprises a fixed experimental sample base 21 fixedly arranged at the bottom of the inner water storage tank 11 and a fixed experimental sample frame 18 which is arranged outside the fixed experimental sample base 21 and plays a protective role, the experiment sample platform has corrosion rate measuring apparatu 31 through probe 32 electric connection, and the top of experiment sample platform is equipped with camera 34, corrosion rate measuring apparatu 31 and host computer 30 electric connection, interior cistern 11 is connected with oxygen supply apparatus 13 through hose 12, is equipped with heating device, temperature sensor 8 and water conservancy diversion hole 7 on the lateral wall of interior cistern 11, and the bottom of outer cistern 6 still is equipped with outlet 16 and drain pipe respectively.
Preferably, the support comprises a first support 22 and a second support 17 symmetrically disposed at left and right sides of the outer water reservoir 6 to increase the coupling stability of the inner water reservoir 11.
Preferably, the drainage pipes comprise a first drainage pipe 23 and a second drainage pipe 15 which are arranged at the left side and the right side of the bottom of the outer reservoir 6, the first drainage pipe 23 and the second drainage pipe 15 are respectively provided with a first valve 25 and a second valve 14, and the water conveying pipeline 5 is provided with a third valve 4.
Preferably, the heating means includes first and second heating means 26 and 10 provided on the inner walls of the left and right sides of the inner reservoir 11.
Preferably, the camera 34 is arranged above the left side of the experimental sample table through a support rod 33, and the support rod 33 is a telescopic support rod.
Preferably, the surface of the box cover 1 is provided with a first heat preservation layer 35, and the outer wall of the inner reservoir 11 is provided with a second heat preservation layer 9.
Preferably, the water pipe 28 is provided with a flow rate meter 29.
Specifically, when the device is used, ecological seawater is prepared in the PH salinity regulating reservoir 3, the third valve is opened to inject the ecological seawater into the accommodating cavity, the ecological seawater is filtered by the filter device 20 to remove impurities and large sediments in water, the water pump 24 injects the ecological seawater into the inner reservoir 11, the ecological seawater in the inner reservoir 11 flows back into the accommodating cavity through the diversion hole 7, the water injection amount of the water pump is controlled by the flow rate meter 29, so that the ecological seawater maintains a specific height in the inner reservoir 11, the specific height is at least determined by submerging the experimental sample platform, and finally the height of the ecological seawater in the inner reservoir 11 reaches a dynamic balance to form a dynamic circulation ecological seawater environment.
During the use process, a certain amount and a certain kind of marine attachment organisms and bacteria are added into the inner reservoir 11, such as sulfate reducing bacteria, algae, shellfish and arthropods, can simulate the original environment of seawater more truly and accurately, irradiate the ecological seawater in the inner reservoir 11 by using the halogen tungsten lamp source 37, simulate the illumination condition of the ocean, provide proper oxygen concentration by using the oxygen supply device 13, heat the ecological seawater to proper temperature by using the heating device, discharge the excessive water by using the first discharge pipe 23 and the first valve 25 on the left side of the bottom of the outer reservoir 6, discharge the second discharge pipe 15 and the second valve 14 on the right side of the bottom to check the filtering condition of the seawater, it should be noted that, in practical application, the outer reservoir 6 and the inner reservoir 11 can be made of transparent materials so as to better observe seawater and corrosion.
The ocean is one of natural environments, and has the characteristics of wide region, strong corrosivity, obvious change along with weather and climate conditions and the like. Inorganic salt ions, such as chloride ions, which are the main constituents of seawater, are an important source of metal marine corrosion. The main factors influencing the marine environment corrosion include dissolved oxygen, sunshine time, seawater temperature, flow velocity and salinity. Wherein the dissolved oxygen belongs to a depolarizer for metal steel under the condition of seawater corrosion, and the cathodic depolarization reaction of the oxygen can retard corrosionAnd (5) etching. Salt dissolution of various inorganic salts can enable seawater to become electrolyte solution, electrochemical corrosion is promoted, and specifically, when ecological seawater is matched, according to components of real seawater, the ecological seawater is matched, wherein NaCl is 20-25 g/L, and MgCL is added to the ecological seawater2 5～8g/L，Na2SO43～6g/L，CaCl2 1～2g/L，KCl 0.5～1g/L，NaHCO3 0.1～0.2g/L，KBr 0.1～0.2g/L，H3BO30.01～0.02g/L，SrCl20.01-0.03 g/L, and a pH value of 8.2.
When a fixed sea area is taken as a research target, the concentration and the type of the salt and the conductivity of the salt are not greatly changed, so the whole process has little influence on corrosion. In any sea area, the corrosion speed of metal is not influenced enough by small change of Ph under the comprehensive action of marine environmental factors. The intensity of the light also decreases with increasing depth of the sea. Because the water temperatures in different seasons in different sea areas are greatly different, the corrosion degrees of zones of the sea are different, and the temperature is relatively dominant in the influence of corrosion speeds of lining steel due to various factors, stable and regular illumination time needs to be maintained, and the weak light simulation illumination is performed in the morning and evening for 3 hours and 3000lx of illumination by combining the actual situation of the sea; the medium light simulates morning and afternoon for 9 hours with an illumination of 5000 lx.
Because the depth of water near the shore of the simulated sea area is not more than 200m, the near shore is influenced by continental climate and rivers, the surface water temperature is 15-18 ℃ in winter, the surface water temperature of the seawater is 25-28 ℃ in summer, and the annual temperature difference is 3-4 ℃ less, when the ecological seawater is heated by the heating device, the ecological seawater can be heated by reasonably selecting an appropriate temperature according to the data.
Example 2:
the embodiment also provides an evaluation method of the device for simulating the metal corrosion state under the marine multi-parameter condition, which comprises the following steps:
s1, placing a sample: fixedly mounting a sample on an experimental sample table;
s2, configuring ecological seawater in the PH salinity regulating pond, and injecting the ecological seawater into the accommodating cavity;
s3, seawater circulation: ecological seawater is injected into the inner reservoir through the water suction pump, the ecological seawater is discharged into the accommodating cavity through the flow guide port, seawater circulation is simulated, and the power of the water suction pump is matched with the number and the flow velocity of the flow guide holes, so that the required water flow velocity is controlled;
s4, adjusting the temperature required by different tests by the ecological seawater through a heating device and a temperature sensor; starting an oxygen supply device to supply oxygen to the test environment;
s5, opening a halogen tungsten lamp source on the inner wall of the sealing box cover to irradiate the ecological seawater by simulating natural light;
s6, adding sulfate reducing bacteria, algae, shellfish and arthropods into the inner reservoir to simulate the marine environment of ecological seawater;
s7, shooting a corrosion picture on the surface of the sample by using a camera, and shooting the complete corrosion condition on the surface of the experimental sample at a fixed angle and distance of 24h at intervals during shooting so that the sample is opposite to a lens and the whole picture is occupied;
s8, measuring the corrosion rate and the area of the obtained picture stain each time by using an image recognition and linear polarization method, obtaining the area change value of the result, corresponding the area change value of the corrosion to the corrosion rate, calibrating the relation between the corrosion area change rate and the corrosion rate, and rapidly measuring the corrosion rate through real-time image monitoring.
Specifically, when the corrosion rate is measured and calculated by a linear polarization method, the polarization resistance of a test sample is monitored in real time on line according to the linear polarization method, the corresponding material corrosion rate can be calculated by a Steven formula and a Faraday law, the corrosion condition is determined, and the relationship between the ratio of the polarization resistance to the polarization current and the natural corrosion current is as follows:
the derivation calculation can obtain:
in the above formula, Rp is the polarization resistance; Δ E is polarization potential, Δ i is polarization current, icorrIs corrosion current, betaa、βcTafel slope, i, of anodic reaction and cathodic reaction, respectively, in the course of corrosionaIs anodic current, icIs a cathodic current.
The linear polarization equation is:
in the formula: b is the proportionality constant of the linear polarization process.
The value of B is a constant for a particular corrosion process. According to the basic principle of electrode process dynamics, beta can be obtainedaAnd betac. Through Faraday's law electrochemical equivalent calculation, the corrosion rate of the metal material can be obtained:
in the formula, in the formula: w is the metal atomic weight, N is the valence number of the metal ion, N is the weight of the metal, and F is the Faraday constant.
More specifically, the corrosion condition of the surface of an underwater test sample is shot in real time at fixed intervals by using a camera, and every time a monitoring period passes, the surface of the sample can generate corrosion spots with different sizes. The change in area of corrosion per unit time and unit area was measured on the surface of the coupon. First, threshold segmentation is performed by Otsu method, and an initial threshold T is set0Dividing the image into a foreground part and a background part, namely a generated microorganism corrosion area and an un-corroded bare steel area, and binarizing the obtained corrosion image; assuming that the total gray level of an image is L, the number of pixels per gray level is NiThe gray level average value of the corroded area and the non-corroded area is as follows:
wherein the content of the first and second substances,
in the formula: n is a radical ofiNumber of pixels per gray level, N being the total number of image pixels, T0For the selected threshold, L is the total gray level of the image, MqIs the average value of gray levels of the corroded areas of the foreground, MhThe gray level of the background non-corroded area is averaged.
The average value M of the gray levels of the entire image is as follows:
M＝Pq×Mq+Ph×Mh
the maximum between-class variance between corroded and non-corroded areas is as follows:
σ2＝Pq×(Mq-M)2+Ph×(Mh-M)2
segmentation to maximize inter-class variance means that the probability of false positives is minimizedAccording to the gray scale characteristic of the image, the corroded image is divided into an un-corroded base material part and a corroded exposed part. Between-class variance σ between non-corroded and corroded parts2The larger the difference between two parts constituting the image, the smaller the difference between the two parts when a part of the object is mistaken for the background or a part of the background is mistaken for the object.
The outline is extracted by taking a Sobel operator as an example, the operator comprises two groups of 3x3 matrixes which are respectively in the transverse direction and the longitudinal direction, and the matrixes and the image are subjected to plane convolution to obtain brightness difference approximate values in the transverse direction and the longitudinal direction respectively so as to carry out edge detection. Performing region growing on the processed image; and combining the pixels with similar properties together by using the difference value of the gray level image and the color of the color image. And (3) firstly, designating a seed point as a growth starting point for each region, then comparing pixel points in the field around the seed point with the seed points, merging points with similar properties and continuing to grow outwards until pixels which do not meet the conditions are included. And finally, counting the area in the outline to obtain the number of pixel points in the outline packet. After the number of contour pixel points is obtained, the area of the corrosion area is obtained according to the total number of the pixel points of the picture shot by the camera:
in the formula: n is the area (number of pixels), m is the number of photo area points, s is the area of the sample, scorrIs the area of etching required.
Finally, taking the area ratio of the corroded area to the whole material as an example, the state that the corroded area accounts for less than 30% of the total area is defined as light corrosion, the state that the corroded area accounts for 30% to 60% of the total area is defined as medium corrosion, and the state that the corroded area accounts for more than 60% of the total area is defined as heavy corrosion. The corrosion rate, the area of the obtained picture stain and the area change value of the last obtained result are measured by the linear polarization method, the area change values of corrosion and the corrosion rate are in one-to-one correspondence, and the relation between the corrosion area change rate and the corrosion rate is calibrated, namely the purpose of rapidly measuring the corrosion rate is achieved by real-time image monitoring so as to convert the corrosion area change into the corrosion rate in the current image obtaining period.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. The utility model provides a metal corrosion state evaluation device under simulation ocean multi-parameter condition, its characterized in that, including PH salinity adjusting tank (3), outer cistern (6) and through the fixed setting of support in the inside interior cistern (11) of outer cistern (6), it holds the chamber to have between interior cistern (11) and outer cistern (6), it is equipped with water inlet (2) to hold the chamber, PH salinity adjusting tank (3) through conduit (5) with water inlet (2) intercommunication holds the intracavity and still is equipped with filter equipment (20) and suction pump (24), suction pump (24) are through water pipe (28) and delivery port (27) and interior cistern (11) intercommunication, and outer cistern (6) top is equipped with seals case lid (1), be equipped with halogen tungsten lamp source (37) on sealing case lid (1), the fixed experiment sample platform that is provided with in the bottom of interior cistern (11), experiment sample platform has corrosion rate measuring apparatu (31) through probe (32) electric connection, and the top of experiment sample platform is equipped with camera (34), corrosion rate measuring apparatu (31) and host computer (30) electric connection, interior cistern (11) are connected with oxygen supply device (13) through hose (12), are equipped with heating device, temperature sensor (8) and water conservancy diversion hole (7) on the lateral wall of interior cistern (11), and the bottom of outer cistern (6) still is equipped with outlet (16) and drain pipe respectively.
2. The device for evaluating the metal corrosion state under the simulated marine multiparameter condition according to claim 1, wherein the experimental sample stage comprises a fixed experimental sample base (21) fixedly arranged at the bottom of the inner water reservoir (11) and a fixed experimental sample frame (18) arranged outside the fixed experimental sample base (21).
3. The device for evaluating the corrosion status of metals under simulated marine multiparameter conditions of claim 1, wherein the brackets comprise a first bracket (22) and a second bracket (17) symmetrically disposed on the left and right sides of the outer water reservoir.
4. The device for evaluating the metal corrosion state under the simulated marine multiparameter condition according to claim 1, wherein the drain pipe comprises a first drain pipe (23) and a second drain pipe (15) which are arranged at the left and right sides of the bottom of the outer reservoir (6), and the first drain pipe (23) and the second drain pipe (15) are respectively provided with a first valve (25) and a second valve (14).
5. The device for evaluating the metal corrosion state under the simulated marine multiparameter condition according to claim 1, wherein a third valve (4) is arranged on the water conveying pipeline (5).
6. A simulated marine multiparameter metal corrosion state assessment device according to claim 1, wherein said heating means comprises first heating means (26) and second heating means (10) arranged on the left and right inner walls of the inner reservoir (11).
7. The device for evaluating the metal corrosion state under the simulated marine multiparameter condition according to claim 1, wherein the camera (34) is arranged at the upper left of the experimental sample table through a support rod (33), and the support rod (33) is a telescopic support rod.
8. The device for evaluating the metal corrosion state under the simulated marine multiparameter condition according to claim 1, wherein a first heat-insulating layer (35) is arranged on the surface of the box cover (1), and a second heat-insulating layer (9) is arranged on the outer wall of the inner reservoir (11).
9. The device for evaluating the metal corrosion state under the simulated marine multiparameter condition according to claim 1, wherein a flow velocity meter (29) is arranged on the water pipe (28).
10. The method for evaluating the device for simulating the metal corrosion state under the marine multi-parameter condition according to claim 1 is characterized by comprising the following steps:
s1, placing a sample: fixedly mounting a metal sample (19) on an experimental sample table;
s2, configuring ecological seawater (36) in the PH salinity regulating pond (3), and injecting the ecological seawater (36) into the accommodating cavity;
s3, seawater circulation: ecological seawater (36) is injected into the inner reservoir (11) through the water suction pump (24), the ecological seawater (36) is discharged to the accommodating cavity through the diversion port (7), seawater circulation is simulated, and the power of the water suction pump (24) is matched with the number and the flow rate of the diversion holes (7), so that the required water flow speed is controlled;
s4, adjusting the temperature required by different tests by the ecological seawater (36) through a heating device and a temperature sensor (8); starting an oxygen supply device (13) to supply oxygen to the test environment;
s5, opening a halogen tungsten lamp source (37) on the inner wall of the sealing cover (1) to irradiate the ecological seawater (36) by simulating natural light;
s6, sulfate reducing bacteria, algae, shellfish and arthropods are added into the inner water reservoir (11) to simulate the marine environment of ecological seawater;
s7, shooting a corrosion picture on the surface of the metal sample (19) by using the camera (34), and shooting the complete corrosion condition on the surface of the experimental sample at a fixed angle and distance of 24h at intervals during shooting so that the sample is opposite to a lens and occupies the whole picture;
s8, measuring the corrosion rate and the area of the obtained picture stain each time by using an image recognition and linear polarization method, obtaining the area change value of the result, corresponding the area change value of the corrosion to the corrosion rate, calibrating the relation between the corrosion area change rate and the corrosion rate, and rapidly measuring the corrosion rate through real-time image monitoring.
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