CN219608719U

CN219608719U - Sample support for intergranular corrosion test

Info

Publication number: CN219608719U
Application number: CN202320420167.8U
Authority: CN
Inventors: 黄雅馨; 马青军; 王楚涵; 陈博文; 韩美; 杨春梅; 魏玉顺; 黄薪钢; 王泽军; 韦晨; 党丽华; 杨阳
Original assignee: Tianjin Institute Of Special Equipment Supervision And Inspection Technology (tianjin Special Equipment Accident Emergency Investigation And Treatment Center)
Current assignee: Tianjin Institute Of Special Equipment Supervision And Inspection Technology (tianjin Special Equipment Accident Emergency Investigation And Treatment Center)
Priority date: 2023-03-08
Filing date: 2023-03-08
Publication date: 2023-08-29
Anticipated expiration: 2033-03-08

Abstract

The utility model discloses a sample support for an intergranular corrosion test, which relates to the technical field of intergranular corrosion tests, wherein the sample support is cylindrical, a pair of two grooves which are mirror symmetrical with the central axis of the cylinder are formed in the cylindrical wall of the sample support, and a plurality of holes with different sizes are formed in the cylindrical wall of the sample support. The sample support is made of corrosion-resistant materials, can be suitable for an intergranular corrosion test method specified by a plurality of standards, and is high in universality and convenient to use and operate. In the test process, the sample support can enable the sample to be kept in the middle of the test solution, so that the sample and the test solution are ensured to be fully contacted, meanwhile, a plurality of samples are prevented from being contacted with each other, the stable operation of the test process is ensured, and better test effect is obtained compared with other sample supports. Meanwhile, the sample support is convenient to hook and store, collision is effectively avoided, the safety of a test is improved, and further the test efficiency is improved.

Description

Sample support for intergranular corrosion test

Technical Field

The utility model relates to a sample support, in particular to a sample support for an intergranular corrosion test, which is suitable for the intergranular corrosion test of austenitic stainless steel in a sulfuric acid-ferric sulfate medium and a nitric acid medium and the intergranular corrosion test of nickel alloy in the sulfuric acid-ferric sulfate medium, a hydrochloric acid medium and the nitric acid medium.

Background

The difference in chemical composition between the surface and the interior of the grains and the presence of impurities and internal stresses along the grain boundaries can cause localized corrosion, i.e., intergranular corrosion, of the metals and alloys that propagates inward along the interfaces between the metal grains. The generation of the inter-crystal corrosion can not see obvious damage signs on the surfaces of metals and alloys, but greatly weakens the inter-crystal bonding force, thereby seriously affecting the mechanical properties of the alloy and having serious harm in the engineering field. Therefore, the intergranular corrosion test of metals and alloys is of great significance in industrial manufacturing and research.

Currently, as the intergranular corrosion standard, the intergranular corrosion test method standard of GB/T4334-2020 austenitic and ferritic-austenitic (duplex) stainless steel and the intergranular corrosion test method standard of GB/T15260-2016 nickel alloy are used in many cases. In GB/T4334-2020, method B is a 50% sulfuric acid-ferric sulfate corrosion test method, method C:65% nitric acid corrosion test method and method G:40% sulfuric acid-ferric sulfate corrosion test method and GB/T15260-2016 method A: iron (iii) -sulfate test, method C: hydrochloric acid test, method D: the nitric acid test requires the test to be conducted in an acidic solution medium. Standard methods require that the test sample be boiled in the test solution and maintained in a reflux, boiling state for a long period of time, some boiling time up to 240 hours. Therefore, the manner of holding the sample and the state of the test procedure during the test may have some influence on the test results. In addition, in the test process, the samples are often put into and clamped by using tweezers, and because the standard method has different requirements on the sizes of the samples, the weights of the samples are different, and the put in and clamped samples can generate unnecessary knocks, so that the vessel can be scratched by the bumps, and the test process is influenced.

Therefore, the sample can be kept in the middle of the test solution, the maximum contact surface between the sample and the test solution is ensured as much as possible, and the test effect is better realized; and the state of the sample in the experimental process is maintained for a long time, so that the test can be stably operated; meanwhile, the clamping and storage of the sample are convenient, and collision between the sample and the wall is avoided, so that the sample is a place which is worth focusing on when the intergranular corrosion test is carried out.

Disclosure of Invention

Aiming at the related technical problems, the utility model provides a sample bracket for an intergranular corrosion test, which can be suitable for an intergranular corrosion test method specified by a plurality of standards, has strong universality and is convenient to use and operate.

The utility model adopts the technical scheme that the sample support for the intergranular corrosion test is cylindrical, a pair of two grooves which are mirror symmetrical with the central axis of the cylinder are formed in the cylindrical wall of the sample support, and a plurality of holes with different sizes are formed in the cylindrical wall of the sample support.

The groove is parallel to the central axis of the cylinder, and is opened from the top end of the cylinder wall of the sample support, and the length of the groove is greater than half of the height of the cylinder.

The sample support is made of corrosion-resistant materials.

The thickness of the cylindrical wall of the sample holder is at least 3mm.

The utility model has the advantages that the utility model is not only suitable for placing samples of a plurality of inter-crystal corrosion test methods, but also can ensure that the samples are stably kept in the middle of the test solution in the test process, ensure that the samples can fully contact with the test solution, and ensure that the test can stably run, thereby better achieving the test effect. In addition, the sample support is convenient for hooking and storing the sample, so that the test device is protected, and collision is effectively avoided. A sample can be placed on a sample support, so that the samples are effectively prevented from being contacted with each other.

Drawings

FIG. 1 is a schematic view of a sample holder for intergranular corrosion testing according to the present utility model;

FIG. 2 is a schematic illustration of a sample holder application of the present utility model.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model; it will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments obtained by those skilled in the art without making any inventive effort are within the scope of the present utility model.

In the description of the present utility model, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "configured to," "engaged with," "connected to," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in figure 1, the sample support 1 for the intergranular corrosion test is cylindrical, a pair of two grooves 2 which are mirror symmetrical with the central axis of the cylinder are formed in the cylindrical wall of the sample support 1, and a plurality of holes 3 with different sizes are formed in the cylindrical wall of the sample support 1.

The groove 2 is parallel to the central axis of the cylinder, and is opened from the top end of the cylinder wall of the sample support 1, and the length of the groove 2 is larger than half of the height of the cylinder. The sample support 1 is made of corrosion-resistant materials. The thickness of the cylindrical wall of the sample holder 1 is at least 3mm.

The sample support is made of acid corrosion resistant materials, is cylindrical as a whole, and is thick in base, so that the whole is stable, and jolt movement caused by boiling of a test solution is avoided. The sample support is provided with two opposite grooves for placing samples, and the depth and the width of the grooves are determined according to the sizes of the samples. Holes with different sizes are distributed on the wall of the sample support, so that the purpose of the sample support is to circulate test solution and to conveniently hook the sample support.

As shown in fig. 2, the sample was placed in the sample holder recess, the sample holder was hooked with a hook, and the sample holder and the sample were slowly placed in a wide-mouth conical flask. One sample holder holds one sample. The dimensions of the sample holder may vary with the size of the sample, as required by standard methods. And placing the wide-mouth conical flask on a heating plate, pouring test solution, starting reflux circulating water, and starting an intergranular corrosion reaction test by temperature regulation and timing.

Example 1: GB/T4334-2020 method B50% sulfuric acid-ferric sulfate corrosion test method

According to the standard method requirement:

processing a sample: the material is S30508 stainless steel; the size is 30 multiplied by 20 multiplied by 4mm; a number of 2;

test solution: 50% sulfuric acid-ferric sulfate corrosive liquid;

test conditions: heating and boiling for 120h;

the test steps are as follows: firstly, measuring the size of a sample, calculating the surface area of the sample, and weighing; secondly, placing the sample at the groove of the sample support, and placing the sample support with the sample placed in a conical wide-mouth bottle; then pouring the prepared test solution with the dosage of not less than 20mL/cm ² Ensuring that the sample on the sample support can be kept in the middle of the solution and that the maximum area of the sample contacts the test solution; starting circulating water, setting the temperature, recording the time after boiling, and heating for 120 hours; and finally, when the test time is reached, stopping heating, cooling to room temperature, closing circulating water, taking out the sample support by a hook, taking out the sample, flushing corrosion products in flowing water, cleaning, drying, weighing, calculating the corrosion rate, taking the average value of the two sample results, and evaluating the test result.

Example 2: GB/T15260-2016 method D nitric acid test method

According to the standard method requirement:

processing a sample: the material is NS3304 nickel alloy; the size is 30 multiplied by 20 multiplied by 4mm; a number of 2;

test solution: 65% nitric acid corrosive liquid;

test conditions: boiling for 48h×5, and placing only one sample in each container;

the test steps are as follows: firstly, measuring the size of a sample, calculating the surface area of the sample, and weighing; secondly, placing the sample at the groove of the sample support, and placing the sample support with the sample placed therein into a coneThe wide-mouth bottle is arranged in; then pouring the prepared test solution with the dosage of not less than 20mL/cm ² Ensuring that the sample on the sample support can be kept in the middle of the solution and that the maximum area of the sample contacts the test solution; starting circulating water, setting temperature, recording time after boiling, performing test for 5 cycles, wherein each cycle is 48 hours, and each cycle uses a newly prepared test solution; finally, after each cycle is completed, the sample bracket with the sample is taken out by the hook, the surface corrosion product is brushed by a soft brush in running water, and the operation is carried out for 5 cycles. And calculating the corrosion rate of each period and the average value of the corrosion rates of 5 periods, and evaluating the test result.

According to the utility model, one sample can be placed in the groove of the sample support, the sample can be tested in the middle of the test solution, the test solution can be fully contacted with the sample support, meanwhile, the mutual contact between a plurality of samples is avoided, the stable operation of the test process is ensured, and a more test effect is obtained compared with other sample supports. The hole in the sample support can effectively facilitate hooking up the sample support and the sample, the access process can effectively avoid collision, the safety of the test is improved, and the test efficiency is further improved.

In view of the foregoing, the present utility model is not limited to the above-described embodiments, and other embodiments can be easily proposed by those skilled in the art within the scope of the technical teaching of the present utility model, but such embodiments are included in the scope of the present utility model.

Claims

1. The sample support for the intergranular corrosion test is characterized in that the sample support (1) is cylindrical, a pair of two grooves (2) which are mirror symmetrical with the central axis of the cylinder are formed in the cylindrical wall of the sample support (1), and a plurality of holes (3) with different sizes are formed in the cylindrical wall of the sample support (1).

2. Sample holder for intergranular corrosion tests according to claim 1, wherein the recess (2) is parallel to the central axis of the cylinder, and from a top opening of the cylindrical wall of the sample holder (1), the recess (2) has a length greater than half the height of the cylinder.

3. The specimen holder for intergranular corrosion test according to claim 1, wherein the specimen holder (1) is of a corrosion resistant material.

4. Sample holder for intergranular corrosion tests according to claim 1, wherein the thickness of the cylindrical wall of the sample holder (1) is at least 3mm.