CN114486459A - Method for judging interlayer of aluminum and aluminum alloy bar - Google Patents
Method for judging interlayer of aluminum and aluminum alloy bar Download PDFInfo
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- CN114486459A CN114486459A CN202210079107.4A CN202210079107A CN114486459A CN 114486459 A CN114486459 A CN 114486459A CN 202210079107 A CN202210079107 A CN 202210079107A CN 114486459 A CN114486459 A CN 114486459A
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- aluminum
- aluminum alloy
- interlayer
- bar
- corrosion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/32—Alkaline compositions
- C23F1/36—Alkaline compositions for etching aluminium or alloys thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8803—Visual inspection
Abstract
The invention provides a method for judging an aluminum and aluminum alloy bar interlayer, which comprises the following steps: and (3) carrying out corrosion treatment on the aluminum bar or the aluminum alloy bar by using an alkali solution, cleaning and drying, and observing the corrosion condition of the corrosion surface for judgment. The determination method can determine whether the interlayer or the connection exists in the aluminum and aluminum alloy bars by naked eyes, and is simple to operate, convenient and fast.
Description
Technical Field
The invention belongs to the field of aluminum profiles, relates to a method for judging an interlayer, and particularly relates to a method for judging an interlayer of an aluminum and aluminum alloy bar.
Background
The aluminum is the most abundant metal element in the earth crust, has small density, excellent ductility and good electric and heat conducting properties, is an active metal, and can form a layer of compact oxide film on the surface of the aluminum in the air, so that the aluminum cannot be further oxidized, and the corrosion resistance effect is achieved. The aluminum profile is widely applied to the fields of buildings, automobiles, aerospace and the like due to excellent performance, wherein the aluminum profile is most widely applied, the profile with the required shape is usually prepared by an extrusion molding plastic deformation process, and in order to improve the production efficiency in the reproduction process, the aluminum blank is continuously extruded, so that the obtained semi-finished products are bound to be connected, but the profile has strength requirements in the industrial field, and the mechanical properties of the profile are greatly influenced by an interlayer of the profile. Currently, there is a method for determining the interlayer between aluminum and aluminum alloy bars.
CN109883857A discloses a method for rapidly detecting internal defects of die-casting aluminum alloy, which comprises the following detection steps: s1, manufacturing a test block for detecting internal defects of the die-casting aluminum alloy; s2, performing impact operation on the die-casting aluminum alloy test block by using a metal pendulum impact tester; s3, confirming internal defects of the fracture after the die-casting aluminum alloy test block is impacted by using an image dimension measuring instrument; and S4, determining whether the die-casting aluminum alloy can be included according to the internal defect judgment standard of the die-casting aluminum alloy. According to the method for rapidly detecting the internal defects of the die-casting aluminum alloy, special detection equipment and analysis software for the internal defects of metal materials are not adopted, a metal pendulum impact tester is combined, a tester is used for manufacturing a test block for die-casting aluminum alloy impact at a specific position, destructive fracture at the specific position of the die-casting aluminum alloy is realized by utilizing the impact operation function of the impact tester, and fracture analysis is carried out on the die-casting aluminum alloy by means of an image size measuring instrument so as to rapidly detect the internal defects of the die-casting aluminum alloy.
CN112345539A discloses an aluminum die casting surface defect detection method based on deep learning, and relates to the technical field of digital image processing. The method comprises the following steps: by adopting a photometric stereo method, a plurality of pictures illuminated at different angles are combined into a format picture, so that the defects of material shortage, scratch and the like are more obvious; and (3) training a target detection model by applying a deep learning method, and detecting defects in the image. The invention adopts a common FA lens and a customized annular light source to finish the polishing of the photometry. The annular light source is averagely divided into four parts, the light on of each part of light source is sequentially controlled by using a control program, only one part of light is lightened each time, and images are collected simultaneously. And after the images are collected, synthesizing the four images into one tiff format image by using a photometric stereo method. As can be seen from the synthesized image, defects such as scratches are clearly present.
Disclosure of Invention
In order to solve the technical problem, the application provides the method for judging the interlayer of the aluminum and aluminum alloy bar, whether the interlayer or the connection exists in the aluminum and aluminum alloy bar can be judged by naked eyes by the method, and the method is simple to operate, convenient and fast.
In order to achieve the technical effect, the invention adopts the following technical scheme:
the invention provides a method for judging an aluminum and aluminum alloy bar interlayer, which comprises the following steps: and (3) carrying out corrosion treatment on the aluminum bar or the aluminum alloy bar by using an alkali solution, cleaning and drying, and observing the corrosion condition of the corrosion surface for judgment.
In the invention, by utilizing the specific characteristic that aluminum can react with alkali liquor, the corrosion speed of the aluminum bar at the interlayer is higher due to alkali corrosion, so that the interface of the interlayer is shown. The reason why the corrosion speed of the interlayer is higher is that the contact surface reacts due to chemical corrosion, and the existence of the interlayer leads to larger contact area between the interlayer and alkali liquor and is easier to corrode, so that the defects of the interlayer after corrosion are amplified and can be checked by naked eyes.
In a preferred embodiment of the present invention, the aluminum bar or the aluminum alloy bar is subjected to hot extrusion and cutting before the determination.
As a preferred embodiment of the present invention, the alkali solution includes a sodium hydroxide solution and/or a potassium hydroxide solution.
In a preferred embodiment of the present invention, the alkali solution has a mass concentration of 10 to 30 wt%, such as 12 wt%, 15 wt%, 18 wt%, 20 wt%, 22 wt%, 25 wt% or 28 wt%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
In a preferred embodiment of the present invention, the etching time is 2 to 5min, such as 2.5min, 3min, 3.5min, 4min or 4.5min, but not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
As a preferable technical scheme of the invention, the washing method is water washing.
In a preferred embodiment of the present invention, the drying temperature is 60-80 ℃, such as 62 ℃, 65 ℃, 68 ℃, 70 ℃, 72 ℃, 75 ℃ or 78 ℃, and the drying time is 30-60 min, such as 35min, 40min, 45min, 50min or 55min, but the drying time is not limited to the recited values, and other values not recited in the above ranges of values are also applicable.
As the preferable technical scheme of the invention, the aluminum bar or the aluminum alloy bar containing the interlayer is characterized in that the phenomenon of discontinuous layering appears after the section is corroded, and the aluminum bar or the aluminum alloy bar without the interlayer is characterized in that the section is uniform and the phenomenon of layering does not exist.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention provides a method for judging an interlayer of an aluminum and aluminum alloy bar, which can judge whether the interlayer exists or is connected inside the aluminum and aluminum alloy bar by naked eyes, and is simple to operate, convenient and quick.
Drawings
FIG. 1 is a schematic cross-sectional view of an aluminum alloy rod with and without an interlayer.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
Detailed Description
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
The embodiment provides a method for judging an aluminum and aluminum alloy bar interlayer, which comprises the following steps: and (3) carrying out corrosion treatment on the aluminum bar subjected to the hot extrusion and cutting treatment for 5min by using a sodium hydroxide solution with the mass concentration of 10 wt%, washing with water, drying, and observing the corrosion condition of the corrosion surface for judgment.
Example 2
The embodiment provides a method for judging an aluminum and aluminum alloy bar interlayer, which comprises the following steps: and (3) carrying out corrosion treatment on the aluminum bar subjected to the hot extrusion and cutting treatment for 2min by using a sodium hydroxide solution with the mass concentration of 30 wt%, washing with water, drying, and observing the corrosion condition of the corrosion surface for judgment.
Example 3
The embodiment provides a method for judging an aluminum and aluminum alloy bar interlayer, which comprises the following steps: and (3) carrying out corrosion treatment on the aluminum bar subjected to the hot extrusion and cutting treatment for 3.8min by using a sodium hydroxide solution with the mass concentration of 20 wt%, washing with water, drying, and observing the corrosion condition of the corrosion surface for judgment.
Example 4
This example was carried out under the same conditions as in example 1 except that the aluminum rod subjected to the hot extrusion and cutting treatment was replaced with an aluminum alloy rod subjected to the hot extrusion and cutting treatment.
Example 5
This example was carried out under the same conditions as example 2 except that the aluminum rod subjected to the hot extrusion and cutting treatment was replaced with an aluminum alloy rod subjected to the hot extrusion and cutting treatment.
Example 6
This example was carried out under the same conditions as example 3 except that the aluminum rod subjected to the hot extrusion and cutting treatment was replaced with an aluminum alloy rod subjected to the hot extrusion and cutting treatment.
Comparative example 1
This comparative example was carried out under the same conditions as in example 1 except that the sodium hydroxide solution was replaced with a hydrochloric acid solution.
Comparative example 2
This comparative example was carried out under the same conditions as in example 4 except that the sodium hydroxide solution was replaced with a hydrochloric acid solution.
Comparative example 3
This comparative example was conducted under the same conditions as in example 1 except that the sodium hydroxide solution was replaced with deionized water.
Comparative example 4
This comparative example was conducted under the same conditions as in example 4 except that the sodium hydroxide solution was replaced with deionized water.
Examples 1-6 and comparative examples 1-4 are aluminum or aluminum alloy rods that have internal defects (interlayer and/or tie-up) after mechanical testing. The corrosion surface of the treated aluminum bar or aluminum alloy bar was observed with the naked eye, and the results are shown in table 1.
TABLE 1
As can be seen from the test results of table 1, the determination results obtained by the determination methods provided in examples 1 to 6 of the present invention are consistent with the results of the mechanical test, whereas the determination results of comparative examples 1 to 4 are contrary to the results of the mechanical test because the interlayer cannot be observed by naked eyes due to the replacement of the alkali solution with the acid solution or the deionized water.
The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (8)
1. A method for judging an aluminum and aluminum alloy bar interlayer is characterized by comprising the following steps: and (3) carrying out corrosion treatment on the aluminum bar or the aluminum alloy bar by using an alkali solution, cleaning and drying, and observing the corrosion condition of the corrosion surface for judgment.
2. The judging method according to claim 1, wherein the aluminum rod or the aluminum alloy rod is subjected to hot extrusion and cutting treatment before the judgment.
3. The determination method according to claim 1 or 2, wherein the alkali solution includes a sodium hydroxide solution and/or a potassium hydroxide solution.
4. The method according to any one of claims 1 to 3, wherein the alkali solution has a mass concentration of 10 to 30 wt%.
5. The method according to any one of claims 1 to 4, wherein the etching treatment is carried out for 2 to 5 min.
6. The determination method according to any one of claims 1 to 5, wherein the washing method is water washing.
7. The method according to any one of claims 1 to 6, wherein the temperature of the drying is 60 to 80 ℃ and the time is 30 to 60 min.
8. The method according to any one of claims 1 to 7, wherein the aluminum bar or aluminum alloy bar containing an interlayer is characterized by a discontinuous phenomenon of delamination after corrosion of a cross section, and the aluminum bar or aluminum alloy bar containing no interlayer is characterized by a uniform cross section and no delamination.
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| CN202210079107.4A CN114486459A (en) | 2022-01-24 | 2022-01-24 | Method for judging interlayer of aluminum and aluminum alloy bar |
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| CN202210079107.4A CN114486459A (en) | 2022-01-24 | 2022-01-24 | Method for judging interlayer of aluminum and aluminum alloy bar |
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| JPH07128327A (en) * | 1993-11-02 | 1995-05-19 | Mitsubishi Alum Co Ltd | Method and equipment for evaluating nonmetallic mixed matter in aluminum |
| JP2004045363A (en) * | 2002-05-22 | 2004-02-12 | National Institute For Materials Science | Method for inspecting defect in metal material |
| US20070017297A1 (en) * | 2005-07-21 | 2007-01-25 | The Boeing Company | Non-destructive inspection system and associated method |
| CN106637212A (en) * | 2016-09-14 | 2017-05-10 | 珠海格力电器股份有限公司 | Metallographic corrosive and alloy macrostructure display method |
| CN109295486A (en) * | 2018-12-05 | 2019-02-01 | 中铝瑞闽股份有限公司 | A kind of determination method of aluminium and aluminium alloy anode oxide material surface material line |
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| FR992491A (en) * | 1949-05-28 | 1951-10-18 | Cie Ind De Mecanique Horlogere | Method and device for detecting defects in bars or strips of non-ferrous metals |
| JPH07128327A (en) * | 1993-11-02 | 1995-05-19 | Mitsubishi Alum Co Ltd | Method and equipment for evaluating nonmetallic mixed matter in aluminum |
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| US20070017297A1 (en) * | 2005-07-21 | 2007-01-25 | The Boeing Company | Non-destructive inspection system and associated method |
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