Inter-crystalline corrosion test vessel suitable for aluminum alloy fastener

Abstract

The utility model discloses an intergranular corrosion test vessel suitable for an aluminum alloy fastener, which comprises a bushing (1), a core sleeve (2) and a support rod (3). Threads are arranged in the lining (1), threads are arranged outside the core sleeve (2), the core sleeve (2) is screwed into the lining (1), and a plurality of supporting rods (3) are arranged in the core sleeve (2). According to the utility model, the vertical height can be adjusted, the beaker does not need to be replaced, the solution is saved, the requirements in GB7998 that the ratio of the surface area of the sample to the volume of the test solution is less than 20mm < 2 > / ml and the sample and the container as well as the sample cannot be contacted with each other can be met, and the accuracy and the test efficiency of the salt spray test are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of test vessels, and particularly relates to a test vessel suitable for the intergranular corrosion test of aluminum alloy fasteners. Background Art

[0002] Intergranular corrosion is a kind of local corrosion, which mainly destroys the bonding between grains, greatly reduces the mechanical strength of metals, and after corrosion, the surface of metals and alloys still maintains a certain metallic luster, making it impossible to detect the signs of damage in time. It is a very dangerous corrosion behavior. Therefore, intergranular corrosion is crucial in the inspection of aluminum alloy fasteners. In existing standards, GB7998 "Determination Method for Intergranular Corrosion of Aluminum Alloys" has detailed regulations on its specific methods and requirements, requiring a constant temperature of 35°C ± 2°C, the specimens to be suspended with plastic wires and completely immersed in the test solution, the ratio between the surface area of the specimens and the volume of the test solution to be less than 20mm 2 / ml, and the specimens should not contact each other or the container. According to relevant standard requirements, when the number of each batch is less than 10,000 pieces, the intergranular corrosion test is 5 pieces, and when the number of each batch is more than 10,000 pieces, the intergranular corrosion test is 10 pieces. It is found in the current stage of the test that when using plastic wires, the fasteners can only be tied and then suspended in a beaker with a glass rod. During the suspension, the test fasteners are likely to contact the inner wall of the beaker and each other in the beaker, affecting the accuracy of the test. Secondly, in order to meet the requirement that the ratio between the surface area of the specimens and the volume of the test solution is less than 20mm 2 / ml, when testing large-sized fasteners, the beaker needs to be replaced. And at present, there is no test vessel suitable for the intergranular corrosion of aluminum alloy materials for fasteners. Summary of the Invention

[0003] The purpose of the utility model is to overcome the above-mentioned drawbacks and provide a test vessel suitable for the intergranular corrosion test of aluminum alloy fasteners, which can adjust the height up and down, does not need to replace the beaker, saves the solution, and can also meet the requirements that the ratio between the surface area of the specimens and the volume of the test solution is less than 20mm 2 / ml, and the specimens should not contact each other or the container, improving the accuracy and test efficiency of the salt spray test.

[0004] The purpose of the utility model and the solution to its main technical problems are achieved by adopting the following technical solutions:

[0005] A test vessel suitable for the intergranular corrosion test of aluminum alloy fasteners of the utility model includes a bushing, a core sleeve, and a support rod, and is characterized in that: the bushing is provided with threads inside, the core sleeve is provided with threads outside, the core sleeve is screwed into the bushing, and several support rods are arranged inside the core sleeve.

[0006] The bushing is made of glass.

[0007] The core sleeve is made of glass.

[0008] The core sleeve can move up and down in the bushing for adjustment.

[0009] Compared with the prior art, the utility model has obvious beneficial effects. From the above technical solutions, it can be seen that by providing threads in the bushing and threads on the outside of the core sleeve, the core sleeve is screwed into the bushing, and several support rods are provided in the core sleeve. Through the mutual cooperation of the internal thread and external thread structures on the external glass bushing and the internal glass core sleeve, the height of the specimen in the solution can be adjusted, ensuring that the specimen does not contact the container wall. There are several support rods. During the intergranular corrosion test, first place the glass bushing in a constant temperature water bath. If the fasteners to be tested have cavities, such as nuts and washers, they can be directly hung on the support rods of the glass core sleeve. If the fasteners have no cavity structure, they are assisted by plastic ropes and hung on the support rods of the glass core sleeve. Then, assemble the core sleeve and the bushing, and adjust to the appropriate height according to the size of the specimen to be tested. The external dimensions of the bushing are a diameter of 250 mm and a height of 180 mm, and the dimensions of the groove are a diameter of 230 mm and a height of 160 mm. Internal threads are tapped downward from the end face of the groove, with a thread size of M12 and a depth of 100 mm. See Figure 2 for the schematic diagram of the external glass bushing. Internal glass core sleeve: Its external dimensions are a diameter of 230 mm and a height of 160 mm, and the external thread size at the lower end is M12 with a depth of 100 mm. There are several support rods on the inner wall of the core sleeve, enabling the adjustment of the height up and down, eliminating the need to replace the beaker, saving the solution, and also meeting the requirement in GB7998 that the ratio of the surface area of the specimen to the volume of the test solution should be less than 20 mm 2 / ml, and the specimens should not contact each other or the container, improving the accuracy and test efficiency of the salt spray test. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic structural diagram of the utility model;

[0011] Figure 2 is a schematic structural diagram of the bushing of the utility model;

[0012] Figure 3 is a schematic structural diagram of the core sleeve of the utility model;

[0013] Figure 4 is a diagram of the usage state of the utility model.

[0014] Markings in the figure

[0015] 1. Bushing, 2. Core sleeve, 3. Support rod, 4. Cavity fastener. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following will, in conjunction with the accompanying drawings and preferred embodiments, elaborate in detail on the specific implementation manners, structures, features and functions of the present utility model as follows.

[0017] A test vessel for intergranular corrosion of aluminum alloy fasteners according to the present utility model includes a bushing 1, a core sleeve 2, and a support rod 3. It is characterized in that: threads are provided inside the bushing 1, threads are provided on the outside of the core sleeve 2, the core sleeve 2 is screwed into the bushing 1, several support rods 3 are provided inside the core sleeve 2, the bushing 1 is made of glass, the core sleeve 2 is made of glass, and the core sleeve 2 can be moved up and down inside the bushing 1 for adjustment.

[0018] During use, first place the glass bushing 1 in a constant temperature water bath. If the cavity fasteners 4 to be tested, such as nuts and washers, can be directly hung on the support rods 3 of the glass core sleeve 2. If they are fasteners without a cavity structure, they can be assisted to be hung on the support rods 3 of the glass core sleeve 2 with a plastic rope. Then assemble the core sleeve 2 and the bushing 3, and adjust the cavity fasteners 4 or the fasteners without a cavity structure to an appropriate height. Then add a certain amount of test solution.

[0019] The above is only a preferred embodiment of the present utility model, and does not impose any form of limitation on the present utility model. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. An intergranular corrosion test vessel for aluminum alloy fasteners, comprising a bushing (1), a core sleeve (2), and a support rod (3), characterized in that; The bushing (1) is provided with threads inside, the core sleeve (2) is provided with threads outside, the core sleeve (2) is screwed into the bushing (1), and several support rods (3) are arranged inside the core sleeve (2).

2. The test vessel for intergranular corrosion test of aluminum alloy fasteners as described in claim 1, characterized in that; The bushing (1) is made of glass.

3. The test vessel for intergranular corrosion test of aluminum alloy fasteners as described in claim 1, characterized in that; The core sleeve (2) is made of glass.

4. The test vessel for intergranular corrosion test of aluminum alloy fasteners as described in claim 1, wherein; The core sleeve (2) can be adjusted by moving up and down inside the bushing (1).

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