CN111103227B - Device for testing anti-discoloration protection effect of high-temperature-resistant coating on stainless steel surface - Google Patents
Device for testing anti-discoloration protection effect of high-temperature-resistant coating on stainless steel surface Download PDFInfo
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- CN111103227B CN111103227B CN201811261556.0A CN201811261556A CN111103227B CN 111103227 B CN111103227 B CN 111103227B CN 201811261556 A CN201811261556 A CN 201811261556A CN 111103227 B CN111103227 B CN 111103227B
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N17/004—Investigating resistance of materials to the weather, to corrosion, or to light to light
Abstract
The utility model provides a test high temperature resistant coating is to stainless steel surface's device of protection effect of preapring for an unfavorable turn of events look which characterized in that: comprises a clamping mechanism; a heating device; a temperature measuring probe; an air exhaust heat dissipation system; a light source; a photoelectric detection probe; and the photoelectric detection circuit receives the optical signal detected by the photoelectric detection probe and transmits the optical signal to the main controller. The invention has the advantages that: quantitative test results can be obtained, and compared with naked eyes, the method is more reliable, cannot be interfered by an environmental light source, and ensures the stability of the test results; the method can be used for comparing the anti-discoloration effects of different coatings, can judge the color difference which can not be identified by naked eyes, and has wider application range and strong practicability; the errors of manual detection and judgment are avoided, so that the test result is more accurate and reliable, and the device has more confidence.
Description
Technical Field
The invention relates to a device for testing the anti-discoloration protection effect of a high-temperature-resistant coating on the surface of stainless steel.
Background
The stainless steel discoloration phenomenon is a quite common phenomenon in the field of food processing, and if stainless steel is used as a material of an inner container in an oven, the stainless steel inner container can be yellowed when being heated and being subjected to a temperature environment of more than 200 ℃ for a long time.
The color developed on the surface of stainless steel is mainly related to several factors related to the oxidation resistance of stainless steel: first, the steel composition, chromium content, is an important component affecting oxidation resistance. The higher the chromium content is, the better the oxidation resistance is, and the slower the discoloration is; secondly, the higher the temperature is, the darker the color is; thirdly, the air and oxygen content also influence the degree of color change; fourthly, time, wherein the heating temperature and the laboratory test of the color change test are generally 1 hour, and the longer the time is, the darker the color is; and fifthly, the rougher the surface is, the easier the surface is to oxidize, and the color is darker under the same condition.
If the surface of the stainless steel is provided with the high-temperature resistant coating, the stainless steel can be protected against oxidation, and the yellowing phenomenon can be obviously relieved. In the prior art, the performance detection of the high-temperature-resistant coating on the surface of the stainless steel is mainly realized by the following modes: the coated stainless steel plate and the uncoated stainless steel plate were simultaneously baked at a high temperature, and then the difference in color was compared by naked eyes. This test method has the following problems:
1. the visual comparison is a qualitative test, final quantitative data is not compared, certain persuasion is lacked, and the visual judgment depends on manual experience and possibly has deviation due to the lighting angle.
2. When the device is used for comparing the effects of different coatings, when the color difference between different coatings is relatively close, naked eyes cannot distinguish easily, an accurate test result cannot be obtained, and the device has great limitation.
3. The effect of possible color difference factors on different stainless steel surfaces prior to baking is not excluded.
In summary, currently, there is basically no special testing device for the anti-discoloration protection effect of the high temperature resistant coating on the stainless steel surface, the existing testing method has certain limitations, and the testing result is not accurate and stable enough, and needs to be further improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device specially used for testing the anti-discoloration protection effect of a high-temperature-resistant coating on the surface of stainless steel aiming at the current situation of the prior art, and the device can effectively improve the accuracy of a test result and has a wider application range.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a test high temperature resistant coating is to stainless steel surface's device of protection effect of preapring for an unfavorable turn of events look which characterized in that: the device comprises
The clamping mechanism is used for clamping and fixing the stainless steel plate to be detected, wherein one surface of the stainless steel plate to be detected is coated with a high-temperature-resistant coating;
the heating devices are respectively arranged on two sides of the stainless steel plate to be measured and used for realizing high-temperature heating;
the temperature measuring probes are respectively arranged on two sides of the stainless steel plate to be measured and used for detecting the surface temperature of the stainless steel plate to be measured;
the exhaust heat dissipation system is used for realizing rapid heat dissipation and cooling of the stainless steel plate to be tested;
the light sources are respectively arranged on two sides of the stainless steel plate to be detected and used for irradiating the surface of the stainless steel plate to be detected;
photoelectric detection probes which are respectively arranged at two sides of the stainless steel plate to be detected and are used for detecting optical signals generated by reflecting the light source by the surface of the stainless steel plate to be detected;
and the photoelectric detection circuit receives the optical signal detected by the photoelectric detection probe and transmits the optical signal to the main controller.
The photoelectric detection circuit comprises
The signal amplification circuit is electrically connected with the photoelectric detection probe and amplifies the optical signal detected by the photoelectric detection probe;
and the signal processing circuit is connected with the output end of the signal amplifying circuit, and averages the detected multiple optical signals and transmits the average value to the main controller.
In order to conveniently clamp the stainless steel plate to be tested, the clamping mechanism preferably comprises at least two symmetrically arranged openable clamping jaws and a swinging arm for driving the clamping jaws to move, the middle part of the swinging arm is hinged with an upright post arranged at an interval between the clamping jaws, the end part of the swinging arm is hinged with the clamping jaws, and the tail part of the swinging arm is connected with a transmission mechanism capable of driving the swinging arm to swing.
For better cooperation stainless steel plate and clamping mechanism that await measuring, as preferred, drive mechanism be the frame that is the U-shaped structure, the bottom of frame is provided with the cylinder, the U-shaped bottom of frame with the piston rod fixed connection of cylinder, the U-shaped both ends of frame respectively with correspond the afterbody hinged joint of swing arm.
In order to reduce the heat dissipation area of the stainless steel plate, make the stainless steel plate easier to heat to a set high temperature and reduce the temperature fluctuation in the constant temperature stage, preferably, the clamping mechanism is further provided with heat insulation plates on two sides of the stainless steel plate to be measured respectively.
In order to improve the test accuracy and ensure the reliability of data acquisition, the center of the heat insulation plate is preferably provided with a through hole. The heating and testing probes can be concentrated on the stainless steel plate exposed out of the central through hole of the heat insulation plate, so that the data acquisition and detection are more accurate and reliable, and the data dispersion and interference after large-range area reflection are avoided.
In order to fix the position of the heat insulation plate at every time, ensure the position fixation of the central through hole and ensure the detection precision, preferably, the periphery of the heat insulation plate is respectively provided with a limiting block. The limiting blocks in all directions can limit the installation position of the heat insulation plate, so that the installation is ensured to be in place at one time, and the detection precision is improved.
Preferably, the heat insulation plate can be made of high-temperature calcium silicate material.
Preferably, the light source is preferably LED blue light in order to increase contrast after heating and sensitivity of signal acquisition. Before baking, stainless steel is silvery white in that it does not substantially absorb any coloured visible light; after baking, the stainless steel begins to yellow, begins to absorb blue light with certain intensity, and reflects yellow light; thus, in the absence of the coating, the signal detected by the photodetector after baking is significantly weaker than before baking, whereas in the case of the coating, the amplitude of the signal weakening after baking should be significantly smaller than before baking, or even not at all.
In order to realize rapid heating to a set high temperature and ensure the consistency of the heating of the two sides of the stainless steel, preferably, the heating device is a laser heating system, and the heating devices positioned at the two sides of the stainless steel plate to be measured keep consistent power in the heating process.
In order to improve the detection sensitivity and simplify the detection wiring, the temperature measuring probe is preferably an infrared temperature measuring probe.
Preferably, the photoelectric detection probe is a photoresistor.
Compared with the prior art, the invention has the advantages that: firstly, the detection device can obtain quantitative test results, is more credible than naked eye discrimination, is not interfered by an environmental light source, and ensures the stability of the detection results; secondly, the method can be used for comparing the anti-discoloration effects of different coatings, can judge the color difference which can not be identified by naked eyes, and has wider application range and strong practicability; in addition, due to the fact that the photoelectric detection circuit is matched with the main controller, the influence of color difference factors possibly existing on different stainless steel surfaces before baking is considered, errors existing in manual detection and judgment are avoided, the test result is more accurate and reliable, and the device is more reliable in confidence.
Drawings
Fig. 1 is a schematic view of an overall structure of a testing apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic view of a heat shield structure according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1 and fig. 2, the embodiment discloses a device for testing the discoloration prevention protection effect of a high temperature resistant coating on a stainless steel surface, which comprises a chamber I, wherein a clamping mechanism, a transmission mechanism, a heating device 5, a temperature probe 6, an air exhaust and heat dissipation system 7, a light source 8, a photoelectric detection probe 9 and a photoelectric detection circuit are arranged in the chamber I.
Wherein, clamping mechanism sets up in the intermediate position of cavity I for the stainless steel II that awaits measuring is fixed in the clamping, for the centre gripping of the stainless steel II that awaits measuring, clamping mechanism is including the clamping jaw 11 that can open and shut that two at least symmetries set up and the swing arm 12 of this clamping jaw 11 action of drive, the middle part of swing arm 12 links to each other with the stand 13 of interval clamping jaw 11 setting is articulated, the tip of this swing arm 12 links to each other with clamping jaw 11 is articulated, the connection of the afterbody of this swing arm 12 can drive the wobbling drive mechanism of this swing arm 12.
The transmission mechanism is a U-shaped frame 2, the bottom of the frame 2 is provided with a cylinder 3, the U-shaped bottom of the frame 2 is fixedly connected with a piston rod 31 of the cylinder 3, and the U-shaped two ends of the frame 2 are respectively hinged with the tail parts of the corresponding swing arms 12. When the cylinder 3 operates and drives the piston rod 31 to extend and contract, the U-shaped frame 2 connected to the piston rod 31 can move up and down together with the piston rod 31.
In order to reduce the heat dissipation area of the stainless steel plate, enable the stainless steel plate to be heated to a set high temperature more easily and reduce the temperature fluctuation in a constant temperature stage, the clamping mechanism is also provided with heat insulation plates 4 on two sides of the stainless steel plate II to be measured respectively; the heat insulation plate 4 is made of high-temperature calcium silicate materials and can bear the temperature of about 300 ℃ for a long time, the center of the heat insulation plate 4 is provided with a circular through hole 41, the area of the stainless steel plate II exposed out of the central through hole 41 of the heat insulation plate 4 is a heating device 5, a temperature measuring probe 6, a light source 8 and an effective area of heating and detection realized by a photoelectric detection probe 9, the mode of centralizing the test on the central through hole 41 enables the collection and detection of data to be more targeted, the method is accurate and reliable, the problem that the heating speed of a large-scale area is low is avoided, the light source 8 is irradiated on the whole stainless steel plate, the data is dispersed and interfered after large-scale reflection is carried out, only the stainless steel plate exposed out of the central through hole 41 of the heat insulation plate 4.
Because clamping corrosion resistant plate all need install heat insulating board 4 again at every turn, in order to make the rigidity that heat insulating board 4 was placed at every turn, thereby guarantee the rigidity of central through-hole 41, guarantee the precision of detection, heat insulating board 4 is the rectangle, is provided with the stopper 42 that big size shape is the same respectively around heat insulating board 4, and the position of heat insulating board 4 installation can be injectd to stopper 42 on all directions, guarantees to install once at every turn and targets in place. When the heat insulation board 4 is clamped for the first time, the position, the orientation and the distance of the heating device 5, the temperature measuring probe 6, the light source 8 and the photoelectric detection probe 9 can be adjusted for one time without subsequent adjustment.
In this embodiment, the same set of detection systems are respectively disposed on two sides of the stainless steel plate II to be detected, each set of detection system includes a heating device 5, a temperature measuring probe 6, an air exhaust heat dissipation system 7, a light source 8 and a photoelectric detection probe 9, wherein the distance between the heating device 5, the temperature measuring probe 6, the light source 8 and the photoelectric detection probe 9 and the region to be detected of the stainless steel plate (i.e., the position of the central through hole 41 of the heat insulation plate 4) is preferably greater than 20cm, if the distance is too small, overheating may be caused, and the device may be damaged.
In order to realize rapid heating to a set high temperature and ensure the consistency of the heating of the two sides of the stainless steel, the heating device 5 adopted in the embodiment is the laser heating device 5, rapid high-temperature heating can be realized, and the heating devices 5 positioned at the two sides of the stainless steel plate to be measured keep consistent power in the heating process.
The temperature measuring probe 6 adopts an infrared temperature measuring probe 6, can be arranged at the front end of the heating device 5 and is used for detecting the surface temperature of the stainless steel plate to be detected, the infrared temperature measuring probe 6 can realize non-contact detection, and the wiring structure is simplified;
the exhaust heat dissipation system 7 is arranged on the upper side wall and the lower side wall of the cavity I of the detection device and is used for realizing rapid heat dissipation and cooling of the stainless steel plate to be detected;
the light source 8 is used for irradiating the surface of the stainless steel plate to be detected, and considering that before baking, the surface of the stainless steel is silvery white because the stainless steel plate does not basically absorb visible light with any color; after baking, the surface of the stainless steel plate starts to yellow, starts to absorb a certain intensity of blue light, and reflects yellow light, so that the light source 8 adopts an LED lamp capable of emitting parallel light, preferably, an LED blue light.
The photoelectric detection probe 9 is a photoresistor and is used for detecting an optical signal generated by the light source 8 reflected by the surface of the stainless steel plate to be detected, transmitting the detected optical signal to a photoelectric detection circuit, amplifying the optical signal by the photoelectric detection circuit, and finally transmitting the amplified optical signal to the main controller.
The photodetection circuit of this embodiment is a conventional circuit, and includes a signal amplification circuit and a signal processing circuit, wherein the signal amplification circuit is electrically connected to the photodetection probe 9, and amplifies the optical signal detected by the photodetection probe 9 (i.e. the photoresistor); in the embodiment, in order to avoid the influence of interference signals and improve the accuracy of detection results, the photoelectric detection probe 9 can continuously collect 20 to 100 optical signals, and then the optical signals are amplified by the signal amplification circuit and averaged by the signal processing circuit and finally output to the main controller.
The method for testing the discoloration prevention protection effect of the high-temperature-resistant coating on the surface of the stainless steel by adopting the device comprises the following steps:
(1) placing the stainless steel plate II to be tested into a testing device, clamping and fixing the stainless steel plate II by using a clamping mechanism, driving a transmission system to move up and down by using an air cylinder 3, and clamping and loosening the stainless steel plate II to be tested and the heat insulation plate 4 by using a swing arm 12 of the clamping mechanism through a lever principle;
the size requirement of the stainless steel plate to be tested is smaller than that of the heat insulation plate 4 and at least larger than the central circular perforated area of the heat insulation plate 4, and one surface of the stainless steel plate II to be tested is coated with a high temperature resistant coating while the other surface is not provided with a coating. When placed, it is theoretically not specified which side of the stainless steel plate is placed upward, but, for convenience in calculating parameters finally and to avoid confusion, it is generally specified that the side coated with the high-temperature resistant coating is placed upward.
(2) Simultaneously starting a light source 8 and a photoelectric detection probe 9 which are positioned at two sides of the stainless steel plate II to be detected at room temperature, recording the light signal values of the upper surface and the lower surface of the stainless steel plate II to be detected by a photoelectric detection circuit, and recording the surface coated with the high-temperature-resistant coating as A1 and the surface not coated with the high-temperature-resistant coating as B1; the existence of A1 and B1 considers the influence of color difference factors possibly existing in different stainless steel surfaces before baking, so that the test result is more convincing.
(3) And closing the light source 8 and the photoelectric detection probe 9, simultaneously starting the heating device 5 and the temperature measurement probe 6 which are positioned on two sides of the stainless steel plate II to be measured, continuously heating and measuring the temperature, starting timing and keeping time T when a preset heating temperature value T is reached, wherein the value range of the preset heating temperature value T is 270-370 ℃, and the value range of the time T is 0.5-3 h.
(4) After, the heating is accomplished, close heating device 5, open cooling system 7 of airing exhaust, after temperature probe 6 detected the temperature value and dropped to the room temperature, open light source 8 and photoelectric detection probe 9 that are located the stainless steel II both sides that await measuring simultaneously, photoelectric detection circuit record the light signal value of the stainless steel II upper and lower surface that awaits measuring, and the one side that the coating has high temperature resistant coating is marked as A2, and the one side that does not coat high temperature resistant coating is marked as B2.
(5) Defining a parameter Z: z ═ B2/B1)/(a2/a1), the parameter Z being used to describe the protection and discoloration prevention effect of high temperature resistance on stainless steel; the detected light signal values a1, B1, a2 and B2 are respectively substituted into the above formula Z ═ (B2/B1)/(a2/a1), and the Z value is calculated and output; the optical signal values a1, B1, a2 and B2 into which the calculation parameter Z is substituted are obtained by averaging N preset number of detection values recorded by the photoelectric detection circuit, and the value range of N is preferably 20 to 100.
In the above formula Z (B2/B1)/(a2/a1), B2/B1 represents the degree of signal reduction of the uncoated side before and after heating, and a2/a1 represents the degree of signal reduction of the coated side before and after heating. When the protection effect of the high-temperature resistant coating is poorer, the signal reduction degree of the coated surface is closer to that of the uncoated surface, namely, the signal reduction degree of B2/B1 is closer to equal to that of A2/A1, namely the value of Z is closer to 1; when the protective effect of the high-temperature resistant coating is better, the signal reduction degree of the coated layer is very large, namely B2/B1 is very small and tends to be 0, and the signal reduction degree of the uncoated layer is very small, namely A2/A1 is close to 1, so that the value of Z is smaller and is closer to 0. Therefore, the closer the value of Z is to 0, the better the protective effect of the high-temperature resistant coating is; the closer the value of Z is to 1, the poorer the protection effect of the high temperature resistant coating, and thus the protection effects of different coatings on the same stainless steel and different stainless steels of the same coating can be quantitatively compared.
Claims (12)
1. The utility model provides a test high temperature resistant coating is to stainless steel surface's device of protection effect of preapring for an unfavorable turn of events look which characterized in that: the device comprises
The clamping mechanism is used for clamping and fixing the stainless steel plate (II) to be tested, wherein one surface of the stainless steel plate (II) to be tested is coated with a high-temperature-resistant coating, and the other surface of the stainless steel plate (II) to be tested is not coated with the coating;
the two heating devices (5) are respectively arranged on two sides of the stainless steel plate (II) to be measured and are used for realizing high-temperature heating;
the two temperature measuring probes (6) are respectively arranged on two sides of the stainless steel plate (II) to be measured and are used for detecting the surface temperature of the stainless steel plate (II) to be measured;
the exhaust heat dissipation system (7) is used for realizing rapid heat dissipation and cooling of the stainless steel plate (II) to be tested;
the two light sources (8) are respectively arranged on two sides of the stainless steel plate (II) to be detected and are used for irradiating the surface of the stainless steel plate (II) to be detected;
the two photoelectric detection probes (9) are respectively arranged on two sides of the stainless steel plate (II) to be detected and are used for detecting optical signals generated by the light source (8) reflected by the surface of the stainless steel plate (II) to be detected;
and the photoelectric detection circuit receives the optical signal detected by the photoelectric detection probe (9) and transmits the optical signal to the main controller.
2. The device for testing the discoloration prevention protection effect of the high temperature resistant coating on the stainless steel surface according to claim 1, wherein: the photoelectric detection circuit comprises
A signal amplification circuit which is electrically connected with the photoelectric detection probe (9) and amplifies the optical signal detected by the photoelectric detection probe (9);
and the signal processing circuit is connected with the output end of the signal amplifying circuit, and averages the detected multiple optical signals and transmits the average value to the main controller.
3. The device for testing the discoloration prevention protection effect of the high temperature resistant coating on the stainless steel surface according to claim 1, wherein: the clamping mechanism comprises at least two symmetrically arranged clamping jaws (11) capable of being opened and closed and swing arms (12) for driving the clamping jaws (11) to move, the middle parts of the swing arms (12) are hinged and connected with stand columns (13) arranged at intervals of the clamping jaws (11), the end parts of the swing arms (12) are hinged and connected with the clamping jaws (11), and the tail parts of the swing arms (12) are connected with transmission mechanisms capable of driving the swing arms (12) to swing.
4. The device for testing the discoloration prevention protection effect of the high temperature resistant coating on the stainless steel surface according to claim 3, wherein: the transmission mechanism is a frame (2) with a U-shaped structure, the bottom of the frame (2) is provided with a cylinder (3), the U-shaped bottom of the frame (2) is fixedly connected with a piston rod (31) of the cylinder (3), and the two U-shaped ends of the frame (2) are respectively hinged with the tail parts of the corresponding swing arms (12).
5. The device for testing the discoloration prevention protection effect of the high temperature resistant coating on the stainless steel surface according to claim 1, wherein: and the clamping mechanism is also provided with heat insulation plates (4) on two sides of the stainless steel plate (II) to be tested respectively.
6. The device for testing the discoloration prevention protection effect of the high temperature resistant coating on the stainless steel surface according to claim 5, wherein: the center of the heat insulation plate (4) is provided with a through hole (41).
7. The device for testing the discoloration prevention protection effect of the high temperature resistant coating on the stainless steel surface according to claim 5, wherein: and the peripheries of the heat insulation plates (4) are respectively provided with a limiting block (42).
8. The device for testing the discoloration prevention protection effect of the high temperature resistant coating on the stainless steel surface according to claim 6, wherein: the heat insulation plate (4) is made of high-temperature calcium silicate materials.
9. The device for testing the discoloration prevention protection effect of the high temperature resistant coating on the stainless steel surface according to claim 1, wherein: the light source (8) is LED blue light.
10. The device for testing the discoloration prevention protection effect of the high temperature resistant coating on the stainless steel surface according to claim 1, wherein: the heating device (5) is a laser heating system, and the heating devices (5) positioned on two sides of the stainless steel plate (II) to be tested keep consistent power in the heating process.
11. The device for testing the discoloration prevention protection effect of the high temperature resistant coating on the stainless steel surface according to claim 1, wherein: the temperature measuring probe (6) is an infrared temperature measuring probe (6).
12. The device for testing the discoloration prevention protection effect of the high temperature resistant coating on the stainless steel surface according to claim 1, wherein: the photoelectric detection probe (9) is a photoresistor.
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| DE10333774B4 (en) * | 2003-07-24 | 2005-06-23 | Atlas Material Testing Technology Gmbh | Calibration of temperature sensors of weathering equipment by contactless temperature measurement |
| US7430485B2 (en) * | 2003-08-22 | 2008-09-30 | Rohm And Haas Company | Method and system for analyzing coatings undergoing exposure testing |
| CN101503798B (en) * | 2009-01-19 | 2010-07-28 | 江西科技师范学院 | Silver plating anti-color changing protecting agent composition |
| CN104749091B (en) * | 2015-04-27 | 2017-09-15 | 上海外高桥造船有限公司 | The Corrosion Protection method of testing of high-temperature resistant workshop primer |
| CN205003065U (en) * | 2015-08-21 | 2016-01-27 | 宁波方太厨具有限公司 | Cooking utensils hold liquid dish surface coating bonding strength testing machine |
| CN105973690B (en) * | 2016-04-28 | 2018-07-17 | 西安交通大学 | A kind of multi- scenarios method environmental simulation and on-line monitoring/observation system |
| EP3484634A4 (en) * | 2016-07-14 | 2020-07-29 | Arcanum Alloys, Inc. | Methods for forming stainless steel parts |
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