CN112595666A - Method for detecting tensile bonding strength of metal covering layer on metal substrate - Google Patents
Method for detecting tensile bonding strength of metal covering layer on metal substrate Download PDFInfo
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- CN112595666A CN112595666A CN202011393212.2A CN202011393212A CN112595666A CN 112595666 A CN112595666 A CN 112595666A CN 202011393212 A CN202011393212 A CN 202011393212A CN 112595666 A CN112595666 A CN 112595666A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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Abstract
The invention discloses a method for detecting tensile bonding strength of a metal covering layer on a metal substrate, which comprises the steps of preparing two cylindrical test pieces which are made of the same material as the covering substrate, taking one test piece with the diameter of about 12mm and the length of about 60mm, manufacturing the covering layer on the smooth and flat end surface of the other test piece, welding the end surfaces of the two test pieces together in a brazing treatment mode, and processing the two test pieces into a cylindrical test piece with the length of about 60mm
The tensile test was performed on a tensile testing machine. If the separation at the solder layer and the cap layer indicates that the bond strength of the cap layer is greater than the tensile strength of the solder layer, and if the separation at the cap layer and the base is recorded, a tensile value F is recorded, and the bond strength of the cap layer can be calculated as follows: p ═ F/S, where: p is the bonding strength of the cover layer (N/mm)2) (ii) a F is the force (N) required to peel the cover layer from the substrate; s is the area (mm) of the bonding of the covering layer and the substrate2). The invention can detect the covering layer with higher tensile bonding strength, and the detection is convenient and reliable.
Description
Technical Field
The invention relates to the technical field of metal corrosion prevention, in particular to a method for detecting tensile bonding strength of a metal covering layer on a metal substrate.
Background
The metal coating adhesion force is the strength of adhesion between the coating and the base metal, i.e., the force required to peel the coating per unit surface area from the base metal. The bonding of the cover layer to the substrate is one of the most important properties for the application of the cover layer. If the binding force is poor, phenomena such as cracking and peeling of the covering layer can occur, so that the protective performance of the covering layer cannot be ensured. Methods for assessing the binding of the coating to the substrate are numerous and include qualitative and quantitative assays. Quantitative detection is difficult, and generally, qualitative detection methods such as a cross-cut method, a winding method, a file test method, an abrasion polishing test method and the like are commonly used. A quantitative detection method is characterized in that a universal method is not available in the existing detection method except that a glue stretching method is a universal method for quantitatively detecting the bonding strength of a covering layer at home and abroad.
The principle of the cement drawing method is shown in FIG. 1. Preparing two cylindrical test pieces which are made of the same material as the covering base body, wherein the diameter of each test piece is about 12mm, the length of each test piece is about 60mm, and the end face of one end of each test piece is required to be smooth and flat. Taking one test piece, manufacturing a covering layer on the smooth and flat end face, bonding the covered smooth end face with a resin adhesive with good bonding strength, processing the adhesive into a standard tensile sample after the adhesive is cured, and performing a tensile test on a tensile testing machine until the two test pieces are separated. If separation of the adhesive from the cover layer indicates that the bond strength of the cover layer is greater than the tensile bond strength of the adhesive, and if separation of the cover layer from the substrate is recorded, a tensile value F is recorded and the bond strength of the cover layer can be calculated as follows.
P＝F/S
In the formula: p is the bonding strength of the cover layer (N/mm)2) (ii) a F is the force (N) required to peel the cover layer from the substrate; s is the area (mm) of the bonding of the covering layer and the substrate2)。
Because the bonding strength of the existing adhesive is generally not high and is basically in the range of 0-50(MPa), the method is only suitable for electroplated layers, sprayed layers and the like with low bonding strength, and for covering layers with the bonding strength far higher than that of the adhesive, the tensile result only indicates that the bonding strength is greater than that of the adhesive, but the specific bonding strength of the covering layers cannot be obtained.
In summary, the present invention provides a method for detecting tensile bonding strength of a metal coating on a metal substrate.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the method for detecting the tensile bonding strength of the metal covering layer on the metal substrate, which can detect the covering layer with higher tensile bonding strength without adopting adhesive bonding, is convenient and reliable to detect and has strong practicability.
In order to achieve the purpose, the invention is realized by the following technical scheme: a method for detecting the tensile bonding strength of a metal covering layer on a metal substrate comprises the following steps:
1. preparing two cylindrical test pieces with the same material as the covering matrix, wherein the diameter of each test piece is about 12mm, the length of each test piece is about 60mm, taking one test piece, manufacturing a covering layer on a smooth and flat end face, welding the end faces of the two test pieces together by adopting a brazing treatment mode instead of adopting adhesive bonding instead of treating the end face of the other test piece, and processing the two test pieces into a finished product
The tensile test was performed on a tensile testing machine. If the separation at the solder layer and the cap layer indicates that the bond strength of the cap layer is greater than the tensile strength of the solder layer, and if the separation at the cap layer and the base is recorded, a tensile value F is recorded, and the bond strength of the cap layer can be calculated as follows:
P＝F/S
in the formula: p is the bonding strength of the cover layer (N/mm)2) (ii) a F is the force (N) required to peel the cover layer from the substrate; s is the area (mm) of the bonding of the covering layer and the substrate2)。
2. The brazing material adopts copper-zinc alloy solder, the welding flux adopts a mixture of borax and boric acid, the end surfaces of the two cylindrical test pieces and the welding flux are heated by an induction heating method, and the brazing is carried out at the temperature of 700 ℃.
3. The tensile test samples are divided into two groups, one group is 2 test samples with cylindrical end faces without covering layers, and the tensile test samples are used for detecting the tensile bonding strength of a brazing layer after brazing. And the other group is test pieces with 1 cylindrical end surface provided with a covering layer and the other cylindrical end surface without the covering layer, and the covering layer tensile test is carried out after brazing.
4. The detection proves that the tensile bonding strength of the copper-zinc brazing sample without the covering layer is about 250 MPa.
The invention has the beneficial effects that:
1. the invention can measure the metal covering layer with higher tensile bonding strength, and improves the measuring range of the original glue stretching method to about 250 MPa.
2. The measuring method is simple and accurate.
Drawings
The invention is described in detail below with reference to the drawings and the detailed description;
FIG. 1 is a schematic diagram of a coated adhesive sample of the background art (coating 1, adhesive layer 2);
FIG. 2 is a schematic view of a clad brazing sample of the present invention (clad layer 1, solder layer 3).
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Referring to fig. 2, the following technical solutions are adopted in the present embodiment: a method for detecting the tensile bonding strength of a metal covering layer on a metal substrate comprises the following steps:
1. preparing two cylindrical test pieces with the same material as the covering matrix, wherein the diameter of each test piece is about 12mm, the length of each test piece is about 60mm, taking one test piece, manufacturing a covering layer on a smooth and flat end face, welding the end faces of the two test pieces together by adopting a brazing treatment mode instead of adopting adhesive bonding instead of treating the end face of the other test piece, and processing the two test pieces into a finished product
See fig. 2, tensile tests were performed on a tensile tester. If the separation at the solder layer and the cap layer indicates that the bond strength of the cap layer is greater than the tensile strength of the solder layer, and if the separation at the cap layer and the base is recorded, a tensile value F is recorded, and the bond strength of the cap layer can be calculated as follows:
P＝F/S
in the formula: p is the bonding strength of the cover layer (N/mm)2) (ii) a F is the force (N) required to peel the cover layer from the substrate; s is the area (mm) of the bonding of the covering layer and the substrate2)。
2. The brazing material adopts copper-zinc alloy solder, the welding flux adopts a mixture of borax and boric acid, the end surfaces of the two cylindrical test pieces and the welding flux are heated by an induction heating method, and the brazing is carried out at the temperature of 700 ℃.
3. The tensile test samples are divided into two groups, one group is 2 test samples with cylindrical end faces without covering layers, and the tensile test samples are used for detecting the tensile bonding strength of a brazing layer after brazing. And the other group is test pieces with 1 cylindrical end surface provided with a covering layer and the other cylindrical end surface without the covering layer, and the covering layer tensile test is carried out after brazing.
4. The detection proves that the tensile bonding strength of the copper-zinc brazing sample without the covering layer is about 250 MPa.
The method for consolidating two cylindrical tensile test pieces by copper-zinc brazing replaces an adhesive, can measure a metal covering layer with high tensile bonding strength, improves the measurement range of an original adhesive tensile method to about 250MPa, and is simple and accurate.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A method for detecting the tensile bonding strength of a metal covering layer on a metal substrate is characterized by comprising the following steps:
(1) preparing two cylindrical test pieces with the same material as the covering base body, wherein the diameter of each test piece is about 12mm, the length of each test piece is about 60mm, taking one test piece, manufacturing a covering layer on a smooth and flat end face, welding the end faces of the two test pieces together by adopting a brazing treatment mode instead of treating the end face of the other test piece and adopting adhesive bonding, and processing the two test pieces into a finished product
The tensile test is carried out on the tensile test machine; if the bonding strength of the covering layer is greater than the tensile strength of the solder layer as shown by the separation of the solder layer and the covering layer, and if the bonding strength of the covering layer is greater than the tensile strength of the solder layer as shown by the separation of the covering layer and the substrate, recording a tensile force value F, wherein the bonding strength of the covering layer can be calculated according to the following formula;
P＝F/S
in the formula: p is the bonding strength of the cover layer (N/mm)2) (ii) a F is the force (N) required to peel the cover layer from the substrate; s is the area (mm) of the bonding of the covering layer and the substrate2)；
(2) The brazing material adopts copper-zinc alloy solder, the welding flux adopts a mixture of borax and boric acid, the end surfaces of the two cylindrical test pieces and the welding flux are heated by an induction heating method, and the brazing is carried out, wherein the welding temperature is 700 ℃;
(3) the tensile test samples are divided into two groups, one group is 2 test samples with cylindrical end faces without covering layers, and the tensile test samples are used for detecting the tensile bonding strength of a brazing layer after brazing; the other group is 1 test piece with a covering layer on the cylindrical end surface and no covering layer on the other cylindrical end surface, and a covering layer tensile test is carried out after brazing;
(4) and the detection shows that the tensile bonding strength of the copper-zinc brazing sample without the coating is about 250 MPa.
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| CN202011393212.2A CN112595666A (en) | 2020-12-03 | 2020-12-03 | Method for detecting tensile bonding strength of metal covering layer on metal substrate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235682A (en) * | 2021-12-27 | 2022-03-25 | 南京日托光伏新能源有限公司 | Method for testing surface coating bonding force of electroplated metal foil for MWT battery pack |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235682A (en) * | 2021-12-27 | 2022-03-25 | 南京日托光伏新能源有限公司 | Method for testing surface coating bonding force of electroplated metal foil for MWT battery pack |
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