Device for rapidly judging whether line reaches metal layer after electrophoresis

Abstract

The utility model provides a device for quickly judging that a lineation reaches a metal layer after electrophoresis, which comprises an iron stand, a support adjusting device, a fixing device and a molybdenum wire, the molybdenum wire is arranged on the fixing device, the fixing device is arranged on the support adjusting device, and the support adjusting device is arranged on the iron stand and is used for realizing the 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 device can quickly and accurately judge the metal layer where the lineation reaches, prevents the corrosion resistance of a galvanized sheet / cold-rolled sheet paint film from being influenced by different lineation depths, and improves the test efficiency.

Description

Technical Field

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

[0002] Corrosion resistance is a key performance indicator of electrophoretic coatings. When evaluating the corrosion resistance of galvanized / cold-rolled steel sheets, scribing is often performed on the surface of the specimen. Scribing simulates actual vehicle scratches, accelerating corrosion damage during salt spray testing. This process reflects the corrosion resistance of the coating during corrosion testing and allows for the evaluation of the coating's corrosion behavior under various conditions. The purpose of scribing is to assess the corrosion resistance of the coating by observing the corrosion conditions in the scribed area during the test. For example, when scribing the same galvanized steel sheet using the same scribing knife, there are two possible scenarios: one in which the scribing depth reaches the zinc layer but does not penetrate it, and the other in which the scribing depth penetrates the zinc layer and reaches the iron substrate. Scribing depth significantly impacts the corrosion resistance of the galvanized steel sheet. Scribing is performed according to customer specifications. Therefore, a device is proposed to rapidly determine whether the scribing process has reached the metal layer of the electrophoretic coating. This device determines the metal layer reached by the scribing process, thereby preventing variations in scribing depth from affecting the corrosion resistance of the galvanized / cold-rolled steel sheet. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, a device is provided to quickly determine whether a scribe line reaches a metal layer after electrophoresis.

[0004] The technical means adopted by this utility model are as follows:

[0005] A device for quickly judging whether a scribe line has reached a metal layer after electrophoresis comprises: an iron stand, a support and adjustment device, a fixing device and a molybdenum wire, wherein the molybdenum wire is mounted on the fixing device, which is mounted on the support and adjustment device, and the support and adjustment device is mounted on the iron stand, and is used to enable the fixing device and the molybdenum wire to be raised and lowered; one end of the molybdenum wire is used to be connected to an electrochemical workstation, and the other end is used to contact a scribe line on a paint film.

[0006] Furthermore, the support and adjustment device is an iron clamp, 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, and the second support rod is horizontally arranged. One side of the second support rod is slidingly 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 adopts an iron block, which is a flat plate structure and is 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 connected to the plurality of mounting holes respectively.

[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 utility model 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 at equal intervals. The bottom end of each molybdenum wire is ground 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 on the galvanized sheet / cold-rolled sheet;

[0015] Step 4: Place the painted board with markings on the iron stand during the test and adjust the position of the board so that one of the markings on the board is directly below the molybdenum wire.

[0016] Step 5. Loosen the second support rod of the iron clamp and lower the iron block with the molybdenum wire until the tip of the molybdenum wire touches the bottom of the scribe line;

[0017] Step 6: Turn on the electrochemical workstation, apply current, and record the change of potential over time. The change of potential over time can be used to determine whether the scribe line reaches the zinc layer or the iron substrate;

[0018] Step 7: After one line is determined, move the iron block and 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 utility model has the following advantages:

[0020] 1. This utility model provides a device for quickly determining whether a stroke has reached a metal layer after electrophoresis. This device can quickly and accurately determine the metal layer reached by the stroke. For example, for galvanized sheet metal, it can quickly and accurately determine whether the stroke has reached the zinc layer or the iron substrate, thus preventing the corrosion resistance of the galvanized sheet metal paint film from being affected by varying stroke depths. This improves test efficiency and greatly facilitates experiments.

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

[0022] 3. The utility model can also be applied to the defect analysis of galvanized sheet / cold rolled sheet and paint film defect analysis. The depth of the line will affect the result of corrosion detection. The defect analysis of galvanized sheet / cold rolled sheet or paint film sheet can be used to determine whether the zinc layer is exposed.

[0023] Based on the above reasons, the utility model 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative labor.

[0025] Figure 1 This is a schematic diagram of the test device of the utility model.

[0026] Figure 2 This is a schematic diagram of the change of 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 potential at the scribe line of the DP590+Z paint board of the present invention over time.

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

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

[0030] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, 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 embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1

[0032] The utility model provides a device for quickly judging whether a line has reached a metal layer after electrophoresis, comprising: an iron frame 1, a support and adjustment device, a fixing device and a molybdenum wire 3, the molybdenum wire 3 being mounted on the fixing device, the fixing device being mounted on the support and adjustment device, and the support and adjustment device being mounted on the iron frame 1, for realizing the lifting and lowering of the fixing device and the molybdenum wire 3; one end of the molybdenum wire 3 is used for connecting to an electrochemical workstation, and the other end is used for contacting a line on a paint film.

[0033] Example 2

[0034] Unlike Example 1, this embodiment of the utility model provides a device for rapidly determining whether a post-electrophoresis scribe line has reached a metal layer, comprising: an iron stand 1, an iron clamp 2, multiple molybdenum wires 3, and an iron block 4. The iron clamp 2 is mounted on the iron stand 1, and the iron block 4 is mounted on the iron clamp 2. The iron block 4 has multiple mounting holes, and the multiple molybdenum wires 3 are vertically connected to the multiple mounting holes. The support and adjustment device uses the iron clamp 2, which has a lifting and lowering adjustment function. The fixing device uses the iron block 4.

[0035] 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 slidingly connected to the first support rod, and the fixing device is installed on the other side of the second support rod.

[0036] Preferably, the iron block 4 is a flat plate structure, parallel to the upper surface of the iron stand 1 .

[0037] 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.

[0038] Preferably, the bottom end of the molybdenum wire 3 has a pointed end, and the pointed end is used to contact the bottom end of the scribe line.

[0039] Example 3

[0040] The utility model also provides a method for quickly judging whether a scribe line reaches a metal layer after electrophoresis, using the above-mentioned device, comprising the following steps:

[0041] Step 1: Assemble the test device of the present invention, which consists of an iron stand 1 with an iron clamp 2, which is connected to an iron block 4; install four molybdenum wires 3 on the iron block 4, which are located in the same straight line, at the same height and spaced 1 cm apart, and the bottom end of each molybdenum wire 3 is ground into a particularly fine tip;

[0042] Step 2: Connect the four electrodes of the electrochemical workstation to the four molybdenum wires 3, with the two outer electrodes measuring current and the two middle electrodes measuring voltage;

[0043] Step 3: Scribe the paint film on the galvanized sheet after electrophoresis, one line to the iron substrate and one line to the zinc layer;

[0044] Step 4: When testing, place the painted board with the markings on the iron stand 1 and adjust the position of the painted board so that one of the markings on the board is directly below the molybdenum wire 3;

[0045] Step 5: Release the iron clamp 2 to lower the molybdenum wire 3, with the iron block 4 bringing the molybdenum wire 3 down until the tip of the molybdenum wire 3 touches the bottom of the scribe line;

[0046] Step 6: Open the electrochemical workstation, write a test program (existing program), run the program, apply a current, and record the change of potential over time;

[0047] Step 7: Determine whether the scribe line reaches the zinc layer or the iron substrate by measuring the change of potential over time;

[0048] 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.

[0049] Here are the results:

[0050] The change of potential at the scratch line of DC56D+Z paint board with time is as follows Figure 2 shown.

[0051] The potential change of the scribe line on the DP590+Z paint board with time is as follows Figure 3 shown.

[0052] The potential change of the scribe line on the HC340LAD+Z paint board over time is as follows Figure 4 shown.

[0053]

[0054] The potential of the zinc layer and the iron substrate changes differently over time, which can quickly distinguish whether the scribe line is drawn on the iron substrate or the zinc layer.

[0055] The utility model provides a device for quickly determining whether a stroke reaches a metal layer after electrophoresis. It can quickly and accurately determine whether the stroke reaches the zinc layer or the iron substrate, thereby avoiding the influence of different stroke depths on the corrosion resistance of the galvanized sheet paint film. This improves test efficiency and brings great convenience to experiments.

[0056] The utility model can also be applied to cold-rolled plates and the like.

[0057] 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 above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions 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) for realizing the lifting and lowering of the fixing device and the molybdenum wire (3); one end of the molybdenum wire (3) is used for connecting to an electrochemical workstation, and the other end is used for contacting a line on a paint film.

2. The device for quickly judging whether a scribe line reaches a metal layer after electrophoresis according to claim 1, characterized in that: The support adjustment device is an iron clamp (2), and the iron clamp (2) 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 a scribe line reaches a 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 a scribe line reaches a 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 wires (3) are 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 a scribe line reaches a 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 a scribe line reaches a 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 end.

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