Corrosion testing device for aluminum alloy material

Abstract

According to the aluminum alloy material corrosion testing device, a corrosion solution is loaded in a cavity of an experiment bin, a bottom supporting seat is fixedly mounted at the bottom of the experiment bin and supports the middle of the lower surface of a test piece, a top cover is arranged at the top of the experiment bin, two guide rings A are arranged at two through holes of the top cover, and pressing rods penetrate through the through holes and middle holes of the guide rings A; the lower end of the pressing rod is pressed on the edge of the upper surface of the test piece, and a shoulder is arranged on the upper portion of the pressing rod. According to the utility model, constant bending stress loading can be carried out on the aluminum alloy test piece in a corrosion state, and the device is low in energy consumption and convenient to operate; the stress loading part is simple, durable and convenient to maintain.

Description

Technical Field

[0001] This utility model relates to the field of metal material experimental technology, specifically to a corrosion testing device for aluminum alloy materials. Background Technology

[0002] Stress corrosion cracking (SCC) is the damage to materials caused by the combined effects of stress and corrosive environments. Factors influencing SCC primarily include environmental, mechanical, and metallurgical factors. Bending stress corrosion cracking testing examines a specimen under stress bending conditions within a corrosive atmosphere to determine if indicators such as SCC susceptibility, crack propagation rate, and corrosion depth meet requirements. After actual metal workpiece production, to verify the stress corrosion resistance of the workpiece, laboratory stress corrosion tests are often performed on specimens that have undergone the same metallurgical treatment, indirectly verifying whether the metal workpiece meets the usage requirements.

[0003] When conducting constant load stress corrosion tests on aluminum alloy specimens, constant pressure can be used to apply bending stress to the specimens. However, most existing stress corrosion specimen pressurization devices are tensile stress devices.

[0004] For example, Chinese Patent 1: A Tensile Stress Corrosion Testing Machine for Samples; Publication No.: CN103091235A; Abstract: A tensile stress corrosion testing machine for samples. It includes a support, a corrosion cup, weights, an upper traction rod, and a lower traction rod. The support includes a crossbeam; the upper end of the upper traction rod is connected to the crossbeam, and the lower end is connected to the sample; the upper end of the lower traction rod is fixedly connected to the bottom of the corrosion cup, and the lower end is provided with a weight holder on the weight holder; the bottom of the corrosion cup is provided with a sample clamping device. A safety rope is also provided on the upper part of the corrosion cup and fixedly connected to the crossbeam. Its advantages are that it has a simple structure as a sample tensile stress corrosion testing device, provides accurate and reliable test data, and allows for adjustment of different alloy samples using weights, making it convenient to use.

[0005] Chinese Patent: 2. A Constant Load Stress Corrosion Torsion Testing Device; Publication No.: CN201909742U; Abstract: A constant load stress corrosion torsion testing device. It includes a frame and a loading system, mainly composed of a support, weights, pulleys, and a turntable. The turntable is mounted on the support via bearings and has angles engraved on it, which, in conjunction with a pointer, indicate the angle of torsion. The pulleys are fixed to the support by screws and are distributed at two opposite corners of the support plane. The turntable, pulleys, and weights are connected in series by a steel wire rope, which is wound in the groove of the turntable. The column is fixed to the support, and the crossbeam is fixed to the column through round holes. The sample is fixed to the crossbeam through square holes. This invention uses a weight loading method, which has the advantages of simple structure, convenient operation, and low cost, and can maintain a constant load.

[0006] The aforementioned prior art 1 concerns the loading of tensile stress during specimen corrosion, and prior art 2 concerns the loading of torsional stress during specimen corrosion. For flexural stress corrosion, particularly the experimental apparatus for four-point bending stress corrosion of aluminum alloy specimens, there is limited publicly available information, and no suitable experimental equipment has been selected. Summary of the Invention

[0007] To address the aforementioned problems, this utility model provides an aluminum alloy corrosion testing device that can apply constant bending stress to aluminum alloy specimens in a corroded state. The device consumes little energy and is easy to operate; the stress loading components are simple, durable, and easy to maintain.

[0008] This utility model is achieved through the following solution:

[0009] A corrosion testing device for aluminum alloy materials includes an experimental chamber filled with a corrosive solution, a bottom support fixedly installed at the bottom of the experimental chamber supporting the middle of the lower surface of the test piece, a top cover at the top of the experimental chamber, two guide rings A at two through holes of the top cover, a pressure rod inserted into the through holes and the hole in the guide ring A, the lower end of the pressure rod pressing against the edge of the upper surface of the test piece, a shoulder at the upper part of the pressure rod, and several weights supported on the shoulder.

[0010] The experimental chamber can be made of tempered acrylic glass for easy observation of the interior. Gravity generated by the weights on the pressure bar is transferred to the specimen to achieve a constant force load. The bending stress on the specimen remains constant at all stages of the experiment. The shoulder of the pressure bar can be coated with rubber to prevent noise or vibration from rigid impacts when weights are placed on it. Furthermore, it prevents the pressure bar from falling and impacting the top cover if the specimen under the pressure bar tipps over. Guide ring A prevents the pressure bar from tilting and maintains its vertical position. The lower end of the pressure bar is designed as a horizontal crossbar to apply force evenly to the edges of the specimen.

[0011] A stabilizing frame is also provided above the top cover, and the feet of the stabilizing frame 4 are anchored to the experimental table with bolts; a guide ring B that matches the position of the guide ring A is also provided on the stabilizing frame 4, and the upper end of the pressure rod passes through the middle hole of the guide ring B.

[0012] The guide ring B on the stabilizer guides the upper end of the pressure bar and works in conjunction with the guide ring A to further guide the verticality of the pressure bar at two points.

[0013] The experimental chamber is also equipped with several heaters, with their terminals located on the top cover. The heaters heat the corrosive liquid within the chamber to achieve the required experimental temperature. Multiple heaters can be arranged to ensure uniform heating and high efficiency. The heaters can be stainless steel single-ended electric heating tubes manufactured by Dongguan Jinye Electric Heating Materials Co., Ltd.

[0014] A temperature sensor is also installed inside the experimental chamber, with its terminals located on the top cover. The temperature sensor is positioned in the center, with the measuring end close to the test piece, to obtain a more effective temperature range for the corrosive solution. The temperature sensor can be connected to the heater via a microcontroller. After setting the heating temperature, the heater automatically and intermittently heats the corrosive solution, maintaining the temperature range. The temperature sensor can be a corrosion-resistant platinum resistance temperature sensor from Xingyi Sensor Manufacturing Co., Ltd., Sanhe City, Langfang City, Hebei Province.

[0015] The experimental chamber has an inlet on one side and an outlet on the top. The inlet is used to inject the treated corrosive solution; the outlet is used to drain the corrosive solution after the experiment.

[0016] Advantages of utility models

[0017] 1. This utility model is specifically designed for constant load four-point bending stress corrosion testing of aluminum alloy specimens. It can apply constant bending stress to aluminum alloy specimens, and the loading pressure remains constant during the experiment.

[0018] 2. The pressure loading component of this utility model uses a purely mechanical structure. The pressurization device does not rely on electricity, and the pressure application is stable and reliable.

[0019] 3. During the operation of this utility model, the experimenter can place the weights with both hands at the same time, making the operation convenient. All operations are performed at the top cover, making maintenance easy. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the present invention in use.

[0021] Figure 2 This is an exploded view of the pressure bar and weights;

[0022] Figure 3 This is an elevation view of the base support.

[0023] The numbers in the diagram are labeled as follows: 1-Experimental chamber; 2-Top cover; 3-Bottom support; 4-Stabilizer; 5-Pressure rod; 51-Guide ring A; 52-Guide ring B; 53-Weight; 54-Shoulder; 6-Temperature sensor; 7-Heater; 8-Test piece. Detailed Implementation

[0024] Example 1

[0025] A corrosion testing device for aluminum alloy materials includes an experimental chamber 1 filled with a corrosive solution, a bottom support 3 fixedly installed at the bottom of the experimental chamber 1, the bottom support 3 supporting the middle of the lower surface of the test piece 8, a top cover 2 at the top of the experimental chamber 1, two guide rings A51 at two through holes of the top cover 2, a pressure rod 5 inserted into the through holes and the hole in the guide ring A51, the lower end of the pressure rod 5 pressing against the edge of the upper surface of the test piece 8, a shoulder 54 at the upper part of the pressure rod 5, and several weights 53 supported on the shoulder 54.

[0026] A stabilizing frame 4 is also provided above the top cover 2, and the feet of the stabilizing frame 4 are anchored to the experimental table with bolts; a guide ring B52 matching the position of the guide ring A51 is also provided on the stabilizing frame 4, and the upper end of the pressure rod 5 passes through the middle hole of the guide ring B52.

[0027] The experimental chamber 1 is also equipped with several heaters 7, and the wiring terminals of the heaters 7 are located on the top cover 2.

[0028] A temperature sensor 6 is also installed inside the experimental chamber 1, and the wiring terminals of the temperature sensor 6 are located on the top cover 2.

[0029] The experimental chamber 1 has an inlet 91 on one side and an outlet 92 on the top.

Claims

1. An apparatus for testing corrosion of an aluminum alloy material, characterized by, The experimental bin (1) is loaded with corrosion solution in the cavity, the bottom support seat (3) is fixedly installed at the bottom of the experimental bin (1), the bottom support seat (3) supports the lower surface of the middle part of the test piece (8), the top cover (2) is arranged at the top of the experimental bin (1), two guide rings A (51) are arranged at two through holes of the top cover (2), the pressure rod (5) is penetrated into the through hole and the middle hole of the guide ring A (51), the lower end of the pressure rod (5) is pressed on the upper surface edge of the test piece (8), the shoulder (54) is arranged on the upper part of the pressure rod (5), and the shoulder (54) supports a plurality of weights (53).

2. The apparatus for testing corrosion of aluminum alloy materials according to claim 1, wherein A stabilizing frame (4) is further arranged above the top cover (2), the foot of the stabilizing frame (4) is bolted and anchored to the experimental table, a guide ring B (52) matched with the position of the guide ring A (51) is further arranged on the stabilizing frame (4), and the upper end of the pressure rod (5) penetrates through the middle hole of the guide ring B (52).

3. The apparatus for testing corrosion of aluminum alloy materials of claim 1, wherein A plurality of heaters (7) are further arranged in the experimental bin (1), and the wiring terminals of the heaters (7) are arranged on the top cover (2).

4. The apparatus for testing corrosion of aluminum alloy materials of claim 1, wherein A temperature sensor (6) is further arranged in the experimental bin (1), and the wiring terminals of the temperature sensor (6) are arranged on the top cover (2).

5. The apparatus for testing corrosion of aluminum alloy materials of claim 1, wherein A liquid inlet (91) is arranged on one side of the upper part of the experimental bin (1), and a liquid outlet (92) is arranged on the upper part.

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