CN112649360A - Method for testing bonding strength of silver coating - Google Patents
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- CN112649360A CN112649360A CN202110019298.0A CN202110019298A CN112649360A CN 112649360 A CN112649360 A CN 112649360A CN 202110019298 A CN202110019298 A CN 202110019298A CN 112649360 A CN112649360 A CN 112649360A
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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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- G—PHYSICS
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- 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
- G01N21/91—Investigating the presence of flaws or contamination using penetration of dyes, e.g. fluorescent ink
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Abstract
The invention relates to the field of mechanical property testing of a plating layer and a coating, in particular to a method for testing the bonding strength of a silver plating layer, which comprises the following steps; s1; the scratch testing system is used for preparing scratches on the surface of the silver coating sample; s2; dripping a chemical color-changing reagent into the scratch; s3; calculating the bonding strength of the silver plating layer according to the corresponding relation between the scratch color development length and the linear load; the bonding strength of the silver plating layer can be quantitatively and accurately represented by combining the micron scratching method of the metal plating layer and the chemical color changing method of the silver; the used measuring devices are common equipment in a plating performance laboratory, and the operation process is simple; alternative chemical color change reagents are common and low in cost; the experimental thought is novel, the combination innovation of the micron scratch method and the chemical color change method can accurately and quantitatively represent the bonding strength of the silver plating layer, and the experimental repeatability is good.
Description
Technical Field
The invention relates to the field of mechanical property testing of a plating layer and a coating, in particular to a method for testing the bonding strength of a silver plating layer.
Background
The silver plating layer has excellent lubricating and antifriction capabilities and excellent high-temperature oxidation resistance, so that the silver plating layer is widely applied to the surfaces of fasteners in medium and high temperature zones in the aerospace field. In production application, the bonding strength of the coating is a key factor influencing the quality and the service life of the coating, and the bonding strength of the coating is a performance test content which is extremely important in production and application.
The common method for testing the bonding strength of the plating layer at present comprises the following steps: bending, taping, and scratch testing. The first two testing methods are mostly used for rough measurement, the bonding strength cannot be quantitatively and accurately evaluated, and the experimental process is easily interfered by subjectivity. The scratch testing method can be used for quantitatively characterizing the bonding strength of the hard coating, and the principle is that linear load is applied to the surface of the coating to prepare a scratch, an acoustic emission signal in the scratching process is monitored, and the corresponding scratch load value at the moment that a scratch head penetrates through the coating and contacts a matrix is used as the bonding strength of the coating. For the silver plating layer, because the hardness is low and the lubricating effect is excellent, when the scratching head reaches the interface of the plating layer and the substrate, the mutation of the acoustic emission signal is often difficult to monitor, so that the bonding strength of the silver plating layer is difficult to determine according to the mutation of the acoustic emission signal in the scratching process.
In the prior invention patents of the method for measuring the bonding strength of the plating layer: the bonding strength of the coating is measured by the Wanghan army through a method of combining an impact type press-in method and an acoustic emission detection technology, so that the defect that the traditional press-in method is difficult to quantitatively or semi-quantitatively detect the size of the bonding strength is overcome, but only a hard coating which is easy to detect an acoustic emission signal can be measured; the March column determines the bonding strength of the coating through a tensile experiment method, the implementation process of the method is complex, a special experiment clamping tool needs to be designed after the coating sample is subjected to gluing treatment, large-scale experiment equipment such as a stretcher needs to be used, and the requirement on the experiment equipment is high; wuchenwu proposes that the bonding strength of the coating is determined by a shot impact method, namely, a relation between the history of the stress of the coating-matrix interface and the characteristic size of the peeling of the coating-matrix interface is established by a shot impact experiment so as to evaluate the bonding performance of the coating film-matrix interface. The method has a complex thought, needs a large amount of theoretical calculation deduction, and is difficult to realize the rapid measurement of the bonding strength of the coating in a short time; at present, in the academic world and the industrial world, a method for accurately and rapidly measuring the bonding strength of a silver plating layer or a soft plating layer is lacked.
Disclosure of Invention
The invention aims to provide a method for testing the bonding strength of a silver plating layer, which can
The purpose of the invention is realized by the following technical scheme:
a method for testing the bonding strength of a silver coating, comprising the steps of:
s1; the scratch testing system is used for preparing scratches on the surface of the silver coating sample;
s2; dripping a chemical color-changing reagent into the scratch;
s3; and calculating the bonding strength of the silver plating layer according to the corresponding relation between the scratch color development length and the linear load.
As a further optimization of the technical scheme, the method for testing the bonding strength of the silver plating comprises the following specific steps of:
s1; clamping and fixing the silver plating sample on an objective table of a scratch test system;
s2; setting scratch parameters in a scratch instrument testing system, and preparing scratches on the surface of the silver coating by using a linear load;
s3; and taking the plating sample off the scratch tester objective table clamp, and cleaning the scraps in the scratch by using a blower and a soft brush.
According to the method for testing the bonding strength of the silver plating layer, the shape of the silver plating layer sample is a plate or a sheet.
As further optimization of the technical scheme, the method for testing the bonding strength of the silver coating can scratch the coating within the loading force range of the linear load.
As further optimization of the technical scheme, the method for testing the bonding strength of the silver plating layer comprises the following specific steps of dripping a chemical color-changing reagent into the scratch:
s1; preparing a chemical color-changing reagent of metal silver, and preparing distilled water and a soft brush;
s2; sucking a small amount of chemical color-changing reagent by using a rubber head dropper, dripping the chemical color-changing reagent into the scratch, and standing for a moment;
s3; and (4) immersing the plating layer sample into distilled water, and cleaning the inside of the scratch by using a soft brush.
As further optimization of the technical scheme, the chemical color-changing reagent is a reagent with stable color-changing reaction of silver.
As further optimization of the technical scheme, the method for testing the bonding strength of the silver plating layer comprises the step of testing the bonding strength of the silver plating layer by using 1mmol/L Na as the chemical color-changing reagent2And (5) preparing an S solution.
As a further optimization of the technical solution, the method for testing the bonding strength of the silver plating layer of the present invention comprises the following steps: and drying the plated sample after the color change treatment, then placing the plated sample under a stereoscopic microscope for observation, judging the critical point of the color change area inside the scratch, and measuring the length of the color development area inside the scratch by using an image measuring system.
As a further optimization of the technical scheme, the method for testing the bonding strength of the silver plating layer of the invention calculates the bonding strength of the plating layer according to the following formula:
the method for testing the bonding strength of the silver coating has the beneficial effects that:
according to the method for testing the bonding strength of the silver plating layer, the bonding strength of the silver plating layer can be quantitatively and accurately represented by combining a micron scratching method of a metal plating layer and a chemical color changing method of silver; the used measuring devices are common equipment in a plating performance laboratory, and the operation process is simple; alternative chemical color change reagents are common and low in cost; the experimental thought is novel, the combination innovation of the micron scratch method and the chemical color change method can accurately and quantitatively represent the bonding strength of the silver plating layer, and the experimental repeatability is good; the test method can provide quantitative data support for coating quality control in industrial production, and has application value.
Drawings
The invention is described in further detail below with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a flow chart of the method for testing the bonding strength of a silver coating according to the present invention;
fig. 2 is a schematic view illustrating the principle of the bonding strength test method of the silver plating according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
in the following, the present embodiment will be described with reference to fig. 1 to 2, and a method for testing the bonding strength of a silver plating layer includes the steps of:
s1; the scratch testing system is used for preparing scratches on the surface of the silver coating sample;
s2; dripping a chemical color-changing reagent into the scratch;
s3; calculating the bonding strength of the silver plating layer according to the corresponding relation between the scratch color development length and the linear load; the bonding strength of the silver plating can be quantitatively and accurately represented by combining the micron scratching method of the metal plating with the chemical color changing method of the silver.
The second embodiment is as follows:
in the following description of the present embodiment with reference to fig. 1 to 2, the first embodiment is further described, and the specific steps of the scratch testing system for preparing scratches on the silver plating surface of the silver plating sample are as follows:
s1; clamping and fixing the silver plating sample on an objective table of a scratch test system; the shape and size of the sample need to meet the clamping requirements of a scratch test system;
s2; setting scratch parameters in a scratch instrument testing system, and preparing scratches on the surface of the silver coating by using a linear load; the silver plating sample is clamped on a micron scratch instrument, and scratch preparation parameters are set as follows: total length of scratch L, initial load L0Initial load hold time t0Linear load range L0～L1Linear loading rate v. And after the parameters are set, starting a scratching program to prepare scratches on the surface of the coating.
S3; and taking the plating sample off the scratch tester objective table clamp, and cleaning the scraps in the scratch by using a blower and a soft brush.
The third concrete implementation mode:
this embodiment will be described with reference to fig. 1 to 2, and this embodiment will further describe a second embodiment in which the silver plating sample is in the form of a plate or a sheet.
The fourth concrete implementation mode:
the third embodiment will be described below with reference to fig. 1 to 2, and the third embodiment will be further described in the present embodiment, in which the range of the linear load applying force can scratch the plating layer.
The fifth concrete implementation mode:
the fourth embodiment will be further described with reference to fig. 1 to 2, and the specific steps of dropping a chemical color-changing reagent into the scratch are as follows:
s1; preparing a chemical color-changing reagent of metal silver, and preparing distilled water and a soft brush; a1 mmol/L solution of Na2S was prepared in one beaker, and distilled water was added to the other beaker to prepare a soft brush.
S2; sucking a small amount of chemical color-changing reagent by using a rubber head dropper, dripping the chemical color-changing reagent into the scratch, and standing for a moment;
s3; immersing the plating layer sample into distilled water, and cleaning the inside of the scratch by using a soft brush; and (3) observing the chemically treated plating layer sample under a stereoscopic microscope, finding out a color change critical point inside the scratch, and measuring the length l' of a color change area inside the scratch by using an image measuring system.
The sixth specific implementation mode:
in the following, this embodiment will be described with reference to fig. 1 to 2, and a fifth embodiment will be further described with reference to this embodiment, in which the chemical color-changing reagent is a reagent in which silver has a stable color-changing reaction.
The seventh embodiment:
the present embodiment will be described with reference to fig. 1 to 2, and the present embodiment further describes an embodiment six, wherein the chemical color-changing reagent is a 1mmol/L Na2S solution; a1 mmol/L solution of Na2S was prepared in one beaker, and distilled water was added to the other beaker to prepare a soft brush.
The specific implementation mode is eight:
the present embodiment will be described below with reference to fig. 1 to 2, and a seventh embodiment will be further described in the present embodiment, in which the method for measuring a scratch development length is: drying the plated sample after the color change treatment, then placing the plated sample under a stereoscopic microscope for observation, judging a critical point of a color change area inside the scratch, and measuring the length of a color development area inside the scratch by using an image measuring system; and calculating the bonding strength of the silver plating layer according to the corresponding relation between the color development length and the linear load. According to the schematic diagram of the principle of the bonding strength test in the invention shown in FIG. 2, the following formula for calculating the bonding strength can be derived:
if the parameters are set as follows: total length of scratch L is 5mm, initial load L01N, initial load hold time t0Is 5s, linear loading load range L0～L1The linear loading speed v is set to be 1-40N and 0.1N/s. A scratch discoloration length of 2.4mm was observed. The bonding strength of the silver plating layer was 19.72N according to the above calculation formula.
The specific implementation method nine:
this embodiment mode eight will be described below with reference to fig. 1 to 2, and the bonding strength of the plating layer is calculated according to the following formula:
it is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and that various changes, modifications, additions and substitutions which are within the spirit and scope of the present invention and which may be made by those skilled in the art are also within the scope of the present invention.
Claims (9)
1. A method for testing the bonding strength of a silver coating is characterized by comprising the following steps: the method comprises the following steps:
s1; the scratch testing system is used for preparing scratches on the surface of the silver coating sample;
s2; dripping a chemical color-changing reagent into the scratch;
s3; and calculating the bonding strength of the silver plating layer according to the corresponding relation between the scratch color development length and the linear load.
2. The method for testing the bonding strength of a silver plating layer according to claim 1, wherein: the scratch testing system comprises the following specific steps of preparing scratches on the surface of the silver coating sample:
s1; clamping and fixing the silver plating sample on an objective table of a scratch test system;
s2; setting scratch parameters in a scratch instrument testing system, and preparing scratches on the surface of the silver coating by using a linear load;
s3; and taking the plating sample off the scratch tester objective table clamp, and cleaning the scraps in the scratch by using a blower and a soft brush.
3. The method for testing the bonding strength of a silver plating layer according to claim 2, wherein: the silver plating sample is in the shape of a plate or a sheet.
4. The method for testing the bonding strength of a silver plating layer according to claim 2, wherein: the loading force range of the linear load can scratch the coating.
5. The method for testing the bonding strength of a silver plating layer according to claim 1, wherein: the specific steps of dripping a chemical color-changing reagent into the scratch are as follows:
s1; preparing a chemical color-changing reagent of metal silver, and preparing distilled water and a soft brush;
s2; sucking a small amount of chemical color-changing reagent by using a rubber head dropper, dripping the chemical color-changing reagent into the scratch, and standing for a moment;
s3; and (4) immersing the plating layer sample into distilled water, and cleaning the inside of the scratch by using a soft brush.
6. The method for testing the bonding strength of a silver plating layer according to claim 5, wherein: the chemical color-changing reagent is a reagent with stable color-changing reaction of silver.
7. The method for testing the bonding strength of a silver plating layer according to claim 5, wherein: the chemical color-changing reagent is 1mmol/L Na2And (5) preparing an S solution.
8. The method for testing the bonding strength of a silver plating layer according to claim 1, wherein: the scratch development length measuring method comprises the following steps: and drying the plated sample after the color change treatment, then placing the plated sample under a stereoscopic microscope for observation, judging the critical point of the color change area inside the scratch, and measuring the length of the color development area inside the scratch by using an image measuring system.
9. The method for testing the bonding strength of a silver plating layer according to any one of claims 1 to 8, wherein: the bonding strength of the plating layer was calculated according to the following formula:
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114088563A (en) * | 2021-10-18 | 2022-02-25 | 首钢集团有限公司 | Experimental method for wear resistance of coating of plated steel plate |
| CN115372188A (en) * | 2022-09-23 | 2022-11-22 | 兰州大学 | Second-generation high-temperature superconducting tape interface strength testing method based on scratch method |
| CN115372188B (en) * | 2022-09-23 | 2023-10-20 | 兰州大学 | Second-generation high-temperature superconducting tape interface strength testing method based on scratch method |
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