Device and method for rapidly judging whether line reaches metal layer after electrophoresis

Abstract

The invention provides a device and a method for quickly judging whether a lineation reaches a metal layer after electrophoresis. The device comprises an iron stand, a supporting and adjusting device, a fixing device and a molybdenum wire, the molybdenum wire is installed on the fixing device, the fixing device is installed on the supporting and adjusting device, and the supporting and adjusting device is installed on the iron stand and used for achieving lifting of the fixing device and the molybdenum wire; one end of the molybdenum wire is connected with an electrochemical workstation, and the other end is in contact with a lineation on a paint film. The method can quickly and accurately judge the metal layer where the lineation reaches, avoids the influence of different lineation depths on the corrosion resistance of a galvanized sheet / cold-rolled sheet paint film, and improves the test efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of corrosion performance testing, and in particular to a device and method for quickly judging whether a scribe line reaches a metal layer after electrophoresis. Background Art

[0002] Corrosion resistance is an important test performance of electrophoretic paint film. When evaluating the corrosion resistance of galvanized sheet / cold-rolled sheet paint film, it is usually necessary to perform a scratching treatment on the surface of the sample. The scratching treatment is a result of artificial destruction to simulate the scratching in actual use of the vehicle, which accelerates the corrosion damage in the salt spray test. It can reflect the corrosion resistance of the paint film in the corrosion test, in order to evaluate the corrosion behavior of the coating under different conditions. The purpose of scratching is to evaluate the corrosion resistance of the coating by observing the corrosion condition of the scratched area during the test. For example, when the same kind of scratching knife is used to scratch on the same galvanized sheet, there are two situations: one is that the scratching depth touches the zinc layer but does not penetrate the galvanized layer; the other is that the scratching penetrates the galvanized layer and reaches the iron matrix. The scratching depth has a great influence on the corrosion resistance of the galvanized sheet paint film. Scribing is performed according to customer requirements. Therefore, a device and method for quickly judging the corrosion resistance of the electrophoretic paint film that reaches the metal layer is invented to determine the metal layer reached by the scratching, so as to avoid affecting the corrosion resistance of the galvanized sheet / cold-rolled sheet paint film due to different scratching depths. Summary of the invention

[0003] In view of the technical problem raised above, a device and method for quickly judging whether a scribe line reaches a metal layer after electrophoresis is provided.

[0004] The technical means adopted by the present invention are as follows:

[0005] A device for quickly judging whether a stroke reaches a metal layer after electrophoresis, comprising: an iron frame, a support and adjustment device, a fixing device and a molybdenum wire, wherein the molybdenum wire is mounted on the fixing device, the fixing device is mounted on the support and adjustment device, and the support and adjustment device is mounted on the iron frame, and is used to realize the lifting and lowering of the fixing device and the molybdenum wire; one end of the molybdenum wire is used to be connected to an electrochemical workstation, and the other end is used to contact the stroke on the paint film.

[0006] Furthermore, the support and adjustment device is an iron clamp, which includes a cross structure, and the cross structure includes a first support rod and a second support rod. The first support rod is vertically installed on the iron frame, and the second support rod is horizontally arranged. One side of the second support rod is slidably connected to the first support rod, and the fixing device is installed on the other side of the second support rod.

[0007] Furthermore, the fixing device is an iron block, which is a flat plate structure parallel to the upper surface of the iron frame.

[0008] Furthermore, a plurality of mounting holes are provided on the iron block, and a plurality of molybdenum wires are provided, which vertically penetrate and are respectively connected in the plurality of mounting holes.

[0009] Furthermore, the plurality of molybdenum wires are located on the same straight line and are arranged at equal intervals and have the same height.

[0010] Furthermore, the bottom end of the molybdenum wire has a pointed end.

[0011] The present invention also provides a method for quickly judging whether a scribe line reaches a metal layer after electrophoresis, and the method includes the following steps:

[0012] Step 1: Install multiple molybdenum wires on the iron block, which are located in the same straight line, at the same height and arranged at equal intervals, and grind the bottom end of each molybdenum wire into a thin tip;

[0013] Step 2, connecting the electrodes of the electrochemical workstation to the upper ends of the plurality of molybdenum wires;

[0014] Step 3, marking the paint film after electrophoresis of the galvanized sheet / cold-rolled sheet;

[0015] Step 4: During the test, place the painted board with the markings on it on the iron frame and adjust the position of the painted board so that one of the markings on the painted board is located directly below the molybdenum wire.

[0016] Step 5, loosen the second support rod of the iron clamp, and let the iron block and the molybdenum wire descend until the tip of the molybdenum wire touches the bottom of the scribe line;

[0017] Step 6, turn on the electrochemical workstation, supply current, record the change of potential over time, and determine whether the scribe line reaches the zinc layer or the iron matrix through the change of potential over time;

[0018] Step 7: After one line is determined, move the iron block and the molybdenum wire upwards, and repeat steps 4 to 6 to determine whether the remaining lines reach the zinc layer or the iron matrix.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The present invention provides a device and method for quickly judging whether the line reaches the metal layer after electrophoresis, which can quickly and accurately judge the metal layer reached by the line. For example, for galvanized sheet, it can quickly and accurately judge whether the line reaches the zinc layer or the iron matrix, avoiding the influence of different line depths on the corrosion resistance of the paint film of the galvanized sheet. It improves the test efficiency and brings great convenience to the experiment.

[0021] 2. The present invention adopts a four-electrode system, and measures the current through the two outer electrodes and the voltage through the two middle electrodes. The change of voltage over time can be obtained. For example, for galvanized sheets, it can be determined whether the line is drawn to the zinc layer or the iron substrate. The measurement process is simple and easy to operate.

[0022] 3. The present invention can also be applied to galvanized sheet / cold-rolled sheet defect analysis and paint film defect analysis. The depth of the line will affect the result of corrosion detection. Whether the zinc layer is exposed can be determined by analyzing the defects of the galvanized sheet / cold-rolled sheet or paint film sheet.

[0023] Based on the above reasons, the present invention can be widely promoted in the fields of corrosion performance testing and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 Schematic diagram of the testing device of the present invention.

[0026] Figure 2 This is a schematic diagram of the change of the potential at the scribe line of the DC56D+Z paint board of the present invention over time.

[0027] Figure 3 This is a schematic diagram of the change of the potential at the scribe line of the DP590+Z paint board of the present invention over time.

[0028] Figure 4 It is a schematic diagram of the change of the potential at the scribe line of the HC340LAD+Z paint board of the present invention with time.

[0029] In the picture: 1. Iron stand; 2. Iron clamp; 3. Molybdenum wire; 4. Iron block. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0034] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0035] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0036] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0037] Example 1

[0038] The present invention provides a device for quickly judging whether a line has reached a metal layer after electrophoresis, comprising: an iron frame 1, a supporting and adjusting device, a fixing device and a molybdenum wire 3, wherein the molybdenum wire 3 is mounted on the fixing device, the fixing device is mounted on the supporting and adjusting device, and the supporting and adjusting device is mounted on the iron frame 1, so as to realize the lifting and lowering of the fixing device and the molybdenum wire 3; one end of the molybdenum wire 3 is used to be connected to an electrochemical workstation, and the other end is used to contact with a line on a paint film.

[0039] Example 2

[0040] Different from Example 1, in this embodiment, a device for quickly judging whether the streaking reaches the metal layer after electrophoresis of the present invention comprises: an iron frame 1, an iron clamp 2, a plurality of molybdenum wires 3 and an iron block 4, wherein the iron clamp 2 is mounted on the iron frame 1, the iron block 4 is mounted on the iron clamp 2, a plurality of mounting holes are opened on the iron block 4, and the plurality of molybdenum wires 3 are respectively vertically penetrated and connected in the plurality of mounting holes. The supporting and adjusting device adopts the iron clamp 2, which has the function of lifting and lowering. The fixing device adopts the iron block 4.

[0041] Preferably, the iron clamp 2 includes a cross structure, which includes a first support rod and a second support rod. The first support rod is vertically installed on the iron frame 1, and the second support rod is horizontally arranged. One side of the second support rod is slidably connected to the first support rod, and the fixing device is installed on the other side of the second support rod.

[0042] Preferably, the iron block 4 is a flat plate structure, parallel to the upper surface of the iron frame 1 .

[0043] Preferably, the plurality of molybdenum wires 3 are located on the same straight line and are arranged at equal intervals and have the same height.

[0044] Preferably, the bottom end of the molybdenum wire 3 has a pointed tip, and the pointed tip is used to contact the bottom end of the scribe line.

[0045] Example 3

[0046] The present invention also provides a method for quickly judging whether a scribe line reaches a metal layer after electrophoresis, using the above device, comprising the following steps:

[0047] Step 1, assemble the test device of the present invention, which is an iron stand 1 with an iron clamp 2, and the iron clamp 2 is connected to an iron block 4; four molybdenum wires 3 located in the same straight line, at the same height and arranged at equal intervals of 1 cm are installed on the iron block 4, and the bottom end of each molybdenum wire 3 is ground into a particularly fine tip;

[0048] Step 2, connect the four electrodes of the electrochemical workstation to the four molybdenum wires 3, wherein the outer two electrodes measure the current and the middle two electrodes measure the voltage;

[0049] Step 3: draw lines on the paint film after electrophoresis on the galvanized sheet, one line to the iron substrate and one line to the zinc layer;

[0050] Step 4: When testing, place the painted board with the lines drawn on the iron frame 1, and adjust the position of the painted board so that one of the lines on the painted board is directly below the molybdenum wire 3;

[0051] Step 5, release the iron clamp 2 to make the molybdenum wire 3 descend, wherein the iron block 4 brings the molybdenum wire 3 down until the tip of the molybdenum wire 3 touches the bottom end of the scribe line;

[0052] Step 6: Open the electrochemical workstation, write a test program (existing program), run the program, give a current, and record the change of potential over time;

[0053] Step 7: Determine whether the scribe line reaches the zinc layer or the iron substrate by the change of the potential over time;

[0054] Step 8: Repeat the above operation and record the change of potential over time for another scribe line to determine whether the scribe line reaches the zinc layer or the iron substrate.

[0055] The results are as follows:

[0056] The change of potential at the scribe line of DC56D+Z paint board with time is as follows Figure 2 shown.

[0057] The change of potential at the scribe line of DP590+Z paint board with time is shown as follows Figure 3 shown.

[0058] The change of potential at the scribe line of HC340LAD+Z paint board with time is as follows Figure 4 shown.

[0059]

[0060]

[0061] The potentials of the zinc layer and the iron substrate change differently over time, which can quickly distinguish whether the scribe line is drawn on the iron substrate or the zinc layer.

[0062] The present invention provides a device and method for quickly judging whether the line reaches the metal layer after electrophoresis, which can quickly and accurately judge whether the line reaches the zinc layer or the iron substrate, avoiding the influence of different line depths on the corrosion resistance of the galvanized sheet paint film, thereby improving the test efficiency and bringing great convenience to the experiment.

[0063] The present invention can also be applied to cold-rolled sheets and the like.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for quickly judging whether a scribe line reaches a metal layer after electrophoresis, characterized in that: include: An iron frame (1), a support and adjustment device, a fixing device and a molybdenum wire (3), wherein the molybdenum wire (3) is mounted on the fixing device, the fixing device is mounted on the support and adjustment device, and the support and adjustment device is mounted on the iron frame (1), and is used to realize the lifting and lowering of the fixing device and the molybdenum wire (3); one end of the molybdenum wire (3) is used to be connected to an electrochemical workstation, and the other end is used to contact a line on a paint film.

2. The device for quickly judging whether the scribe line reaches the metal layer after electrophoresis according to claim 1, characterized in that: The support and adjustment device is an iron clamp (2), which includes a cross structure. The cross structure includes a first support rod and a second support rod. The first support rod is vertically installed on the iron frame (1), and the second support rod is horizontally arranged. One side of the second support rod is slidably connected to the first support rod, and the fixing device is installed on the other side of the second support rod.

3. The device for quickly judging whether the streaking line reaches the metal layer after electrophoresis according to claim 1, characterized in that: The fixing device adopts an iron block (4), and the iron block (4) is a flat plate structure and is parallel to the upper surface of the iron frame (1).

4. The device for quickly judging whether the streaking line reaches the metal layer after electrophoresis according to claim 3, characterized in that: The iron block (4) is provided with a plurality of mounting holes, and the molybdenum wire (3) is provided with a plurality of wires, which are respectively vertically penetrated and connected in the plurality of mounting holes.

5. The device for quickly judging whether the scribe line reaches the metal layer after electrophoresis according to claim 4, characterized in that: The plurality of molybdenum wires (3) are located on the same straight line and are arranged at equal intervals and have the same height.

6. The device for quickly judging whether the scribe line reaches the metal layer after electrophoresis according to any one of claims 1 to 5, characterized in that: The bottom end of the molybdenum wire (3) has a pointed tip.

7. A method for quickly judging whether a scribe line reaches a metal layer after electrophoresis, using the device for quickly judging whether a scribe line reaches a metal layer after electrophoresis according to any one of claims 1 to 6, characterized in that: The steps include: Step 1, installing a plurality of molybdenum wires (3) on an iron block (4) in the same straight line, at the same height and arranged at equal intervals, and grinding the bottom end of each molybdenum wire (3) into a fine tip; Step 2, connecting the electrodes of the electrochemical workstation to a plurality of molybdenum wires (3); Step 3, marking the paint film after electrophoresis of the galvanized sheet / cold-rolled sheet; Step 4: During the test, place the painted board with the markings on it on the iron stand (1), and adjust the position of the painted board so that one of the markings on the painted board is located directly below the molybdenum wire (3); Step 5, loosen the second support rod of the iron clamp (2), so that the iron block (4) and the molybdenum wire (3) are lowered until the tip of the molybdenum wire (3) contacts the bottom of the scribe line; Step 6, turn on the electrochemical workstation, supply current, record the change of potential over time, and determine whether the scribe line reaches the zinc layer or the iron matrix through the change of potential over time; Step 7: After one marking line is determined, move the iron block (4) and the molybdenum wire (3) upwards, and repeat steps 4 to 6 to determine whether the remaining marking lines reach the zinc layer or the iron substrate.

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