CN111398154A

CN111398154A - Multi-channel loading and corrosion electrolytic cell device considering tensile and compressive stress influence

Info

Publication number: CN111398154A
Application number: CN202010246906.7A
Authority: CN
Inventors: 杨宏启; 吴思远; 汪厚呈; 张崎; 刘刚; 黄一
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-07-10
Anticipated expiration: 2040-03-31
Also published as: CN111398154B

Abstract

The invention provides a multi-channel loading and corrosion electrolytic cell device considering tensile and compressive stress influence, which comprises: the PVC frame, a plurality of PVC supports and a plurality of loading bolts; the loading bolt is used for rotating the threaded hole of the PVC frame base, and the upper surface of the loading bolt is embedded in the central groove at the bottom of the PVC bracket; the top of the PVC frame 1 is provided with two rows of holes: well I and well II; the bottom of the PVC frame is provided with six equidistant threaded holes which are matched with six loading bolts; a row of holes III are formed in the position, not the center line, of the threaded hole in the bottom of the PVC frame and are opposite to the holes IV of the PVC support in the vertical direction. According to the invention, the loading mode is changed, so that the working area of the sample is subjected to the bending stress with the same size, and the stress monitoring consistency and the test result accuracy are ensured; the invention is a multi-channel experimental device, can be modified on the existing basis to adapt to the situation of simultaneously testing more samples, and greatly improves the test efficiency compared with a single-channel experimental method.

Description

Multi-channel loading and corrosion electrolytic cell device considering tensile and compressive stress influence

Technical Field

The invention relates to the technical field of corrosion and protection of ocean engineering, in particular to a multichannel loading device and a corrosion electrolytic cell device considering the influence of tension and compression stress.

Background

At present, when a three-electrode electrochemical corrosion measurement test is carried out by utilizing the existing corrosion electrolytic cell device considering stress influence, the adopted experimental stress loading device is generally a three-point stress loading device (figure 1) or a single-channel four-point loading device (figure 2), and is made of metal materials.

The three-point loading device has the following defects: in a three-point loading mode, the stress on the working surface of the sample monitored by an electrochemical experiment is uneven, and the maximum stress appears on a line at the maximum stress deformation of the sample; because the maximum stress concentration of three-point loading appears on one line, errors can appear in structural stress monitoring in a corrosion experiment considering stress, experimental analysis is influenced, and experimental results are inaccurate.

The single-channel four-point loading device has the following defects: the experiment can be performed only for a single sample, and the experiment efficiency is low; the existing four-point loading device can only research the electrochemical behavior of the tensile stress surface of a sample and cannot perform electrochemical monitoring on the compression surface of the sample at the same time.

Disclosure of Invention

In view of the above-mentioned technical problems, a multi-channel loading and corrosion cell device considering the influence of tensile and compressive stresses is provided. The invention mainly utilizes a multi-channel loading device and a corrosion electrolytic cell device considering the influence of tension and compression stress, which are characterized by comprising the following components: PVC frame, a plurality of PVC support, a plurality of loading bolt. The loading bolt is used for rotating the threaded hole of the PVC frame base, and the upper surface of the loading bolt is embedded in the central groove at the bottom of the PVC bracket; the top of the PVC frame is provided with two rows of holes: well I and well II.

Furthermore, the bottom of the PVC frame is provided with six equidistant threaded holes which are matched with six loading bolts; a row of holes III are formed in the position, not the center line, of the threaded hole in the bottom of the PVC frame and are opposite to the holes IV of the PVC support in the vertical direction.

Furthermore, both end plates of the PVC frame are provided with a through hole V and a hole VI in the horizontal direction; the loading bolt is rotated through the bottom of the PVC frame, so that the horizontally placed PVC support rises, and then the sample placed on the PVC support is limited by the semicircular shapes on the two sides of the frame to realize loading.

Further, the magnitude of the loading force is adjusted by adjusting the depth of rotation of the bolt of the loading bolt in the threaded hole.

Furthermore, a reference electrode required by electrochemical corrosion measurement is installed through a hole II in the PVC frame and aligned to the working surface of the sample, a counter electrode required by electrochemical corrosion measurement is installed through a hole I and aligned to the working surface of the sample, and electrochemical monitoring of the upper surface of the sample is achieved;

furthermore, reference electrodes required by electrochemical corrosion measurement are arranged on the lower surface hole III and the PVC support hole IV of the PVC frame, and counter electrodes required by electrochemical corrosion measurement are placed in the through hole V and the hole VI of the support, so that the electrochemical monitoring of the pressed lower surface of the sample is realized.

Compared with the prior art, the invention has the following advantages:

according to the invention, the loading mode is changed, so that the working area of the sample is subjected to the bending stress with the same size, and the stress monitoring consistency and the test result accuracy are ensured; the multi-channel experimental device can be adapted to the situation of simultaneous experiment of more samples on the basis of the prior art, and compared with the single-channel experimental method, the experimental efficiency is greatly improved; the device considers two surfaces of a bending loading sample, namely a tension surface and a compression surface in advance, forms two sets of three-electrode systems through design, and simultaneously researches the influence of tensile stress and compression stress on corrosion in an electrolyte solution, thereby realizing the multiple purposes of the device; the device adopts the preparation of PVC material, and the contact mode of metal and solution when not only having reduced the cost but also can having changed original corrosion research can directly place the device in electrolyte solution, just so can realize the real-time supervision to electrolyte characteristics such as experiment electrolyte temperature, dissolved oxygen content, velocity of flow, pH value. The requirements of experimental conditions are reasonably guaranteed, and the accuracy and the high efficiency of measured data are easily realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a three-point stress loading apparatus.

Fig. 2 is a single-channel four-point loading device.

FIG. 3 is a schematic view of the structure of the apparatus of the present invention.

FIG. 4 is a left side view of the device of the present invention.

FIG. 5 is a perspective view of the device of the present invention.

FIG. 6 is a schematic view of the loading (three electrodes) of the present invention.

FIG. 7 is a schematic view of the stress gradient of the present invention.

FIG. 8 is a schematic view of the multi-channel loading (three electrodes) of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As shown in fig. 1 to 8, the present invention provides a multi-channel loading device and corrosion cell device considering the influence of tensile and compressive stresses, which is characterized by comprising: PVC frame 1, a plurality of PVC support 2, a plurality of loading bolt 3.

As a preferred embodiment, in the present application, the loading bolt 3 is rotated to a threaded hole of the base of the PVC frame 1, and the upper surface of the loading bolt 3 is embedded in the bottom central groove 6 of the PVC bracket 2; the top of the PVC frame 1 is provided with two rows of holes: well I11 and well II 12.

In the application, the bottom of the PVC frame 1 is provided with six equidistant threaded holes which are matched with six loading bolts 3; the bottom of the PVC frame 1 is provided with a row of holes III 8 at the non-central line of the threaded hole, and the holes III 8 are opposite to the holes IV 7 of the PVC bracket 2 in the vertical direction. It is understood that in other embodiments, the number and the positions of the holes can be reasonably selected and set according to actual conditions, and experimental requirements can be easily met.

Two end plates of the PVC frame 2 are provided with a through hole V9 and a hole VI 10 in the horizontal direction; the loading bolt 3 is rotated through the bottom of the PVC frame 1, so that the horizontally placed PVC support 2 rises, and then the sample placed on the PVC support 2 is limited by the semicircular parts 5 on the two sides of the frame 1 to realize loading.

As a preferred embodiment, in the present application, it is preferable to adjust the magnitude of the loading force by adjusting the depth of the bolt rotation of the loading bolt 3 in the threaded hole. It is understood that in other embodiments, similar means such as: the length of the connecting line or the plate/block is changed to realize adjustment.

Meanwhile, the reference electrode required by electrochemical corrosion measurement is installed through the hole II 12 in the PVC frame 1 and aligned to the working surface of the sample, the counter electrode required by electrochemical corrosion measurement is installed through the hole I11 and aligned to the working surface of the sample, and electrochemical monitoring of the upper surface of the sample is achieved.

As a preferable embodiment, the electrochemical monitoring of the pressed lower surface of the sample is realized by installing reference electrodes required by electrochemical corrosion measurement on the lower surface hole III 8 and the PVC support hole IV 7 of the PVC frame 1 and placing counter electrodes required by the electrochemical corrosion measurement on the through hole V9 and the hole VI 10 of the support 2.

As a preferred embodiment of the application, the multichannel loading and corrosion electrolytic cell device considering the influence of tension and compression stress comprises a PVC frame 1, six PVC brackets 2 and six loading bolts 3; the loading bolt 3 rotates to pass through a threaded hole of a base of the PVC frame 1, and the upper surface of the loading bolt is embedded in a central groove at the bottom of the PVC bracket; the top of the PVC frame 1 is provided with two rows of holes:

holes

11 and 12; the bottom of the PVC frame 1 is provided with six equidistant threaded holes which are matched with six loading bolts 3; a row of holes 8 are formed in the bottom of the PVC frame 1 near the non-central line of the threaded hole and are opposite to the holes 7 of the PVC bracket 2 in the vertical direction; both end plates of the PVC frame 2 are provided with a through hole 9 and a hole 10 in the horizontal direction; the complete schematic of the apparatus is shown in fig. 3-5. The loading bolt 3 is rotated at the bottom of the PVC frame 1 to enable the horizontally placed PVC support 2 to rise, so that a sample placed on the PVC support 2 is limited by the semicircles at the two sides of the frame 1 to realize loading, and the size of loading force can be adjusted by adjusting the progress of the loading bolt 3; the reference electrode required by the electrochemical corrosion measurement can be aligned to the middle part of the working area of the sample through the hole 12 on the PVC frame 1, the counter electrode required by the electrochemical corrosion measurement can be aligned to the working area of the sample through the hole 11, and the electrochemical behavior of the tensioned upper surface of the loaded sample can be researched by a three-electrode system; besides, a reference electrode required by electrochemical corrosion measurement can be arranged on the lower surface hole 8 of the PVC frame 1 and the PVC support hole 7, and a counter electrode required by electrochemical corrosion measurement is placed in the through hole 9 and the hole 10 of the support 2, so that the electrochemical monitoring of the pressed lower surface of the sample can be realized. The final realization of the multichannel gradient stress loading effect and the three-electrode electrochemical measurement effect is shown in FIGS. 7-8.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-channel loading and corrosion cell apparatus that accounts for the effects of tensile and compressive stresses, comprising: the PVC frame (1), a plurality of PVC brackets (2) and a plurality of loading bolts (3);

the loading bolt (3) is rotated to form a threaded hole in the base of the PVC frame (1), and the upper surface of the loading bolt (3) is embedded in a central groove (6) in the bottom of the PVC support (2); the top of the PVC frame (1) is provided with two rows of holes: a hole I (11) and a hole II (12);

the bottom of the PVC frame (1) is provided with six equidistant threaded holes which are matched with six loading bolts (3); a row of holes III (8) are arranged at the non-central line of the threaded hole at the bottom of the PVC frame (1) and are opposite to the holes IV (7) of the PVC bracket (2) in the vertical direction;

two end plates of the PVC frame (2) are provided with a through hole V (9) and a hole VI (10) in the horizontal direction; the loading bolt (3) is rotated through the bottom of the PVC frame (1) to enable the PVC support (2) placed horizontally to ascend, and then the sample placed on the PVC support (2) is limited by the semicircular shapes (5) on the two sides of the frame (1) to be loaded.

2. The multi-channel loading and corrosion cell apparatus considering tensile and compressive stress effects of claim 1, wherein:

the magnitude of the loading force is adjusted by adjusting the depth of the bolt of the loading bolt (3) rotating in the threaded hole.

3. The multi-channel loading and corrosion cell apparatus considering tensile and compressive stress effects of claim 1, wherein:

and a reference electrode required by electrochemical corrosion measurement is arranged through a hole II (12) in the PVC frame (1) and aligned to the working surface of the sample, and a counter electrode required by electrochemical corrosion measurement is arranged through a hole I (11) and aligned to the working surface of the sample, so that the electrochemical monitoring of the upper surface of the sample is realized.

4. The multi-channel loading device and corrosion electrolytic cell device considering the influence of tensile and compressive stresses as claimed in claim 1, wherein:

a reference electrode required by electrochemical corrosion measurement is arranged on a lower surface hole III (8) and a PVC support hole IV (7) of the PVC frame (1), and a counter electrode required by electrochemical corrosion measurement is placed on a through hole V (9) and a hole VI (10) of the support (2), so that the electrochemical monitoring of the pressed lower surface of the sample is realized.