CN107655827B - Watch appearance piece surface vacuum coating adhesion strength detection method - Google Patents
Watch appearance piece surface vacuum coating adhesion strength detection method Download PDFInfo
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Abstract
The invention relates to the technical field of detection of vacuum coating adhesion strength, in particular to a method for detecting the vacuum coating adhesion strength on the surface of a watch appearance piece, which comprises the following detection steps: deforming the sample to be detected, wherein the sample to be detected is annular; and observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not and whether coating scraps exist or not, wherein if the vacuum coating at the position with the highest deformation degree is not stripped and the coating scraps do not exist, the detection result is qualified. The method for detecting the surface vacuum plating adhesion strength of the watch appearance piece can directly detect the watch appearance piece, and judge whether the watch appearance piece sample to be detected is deformed and whether the vacuum plating at the position with the strongest deformation degree is stripped or not and whether plating scraps exist or not by observing the deformation degree. Therefore, the detected result is obtained by directly detecting and judging the formed watch appearance piece, and the method is more reliable.
Description
Technical Field
The invention relates to the technical field of detection of vacuum coating adhesion strength, in particular to a method for detecting the vacuum coating adhesion strength on the surface of a watch appearance piece.
Background
Watch appearance pieces on the market at present generally adopt corrosion-resistant stainless steel materials with excellent performance, and cover layers with different colors are covered on the surfaces of the stainless steel materials so as to improve the aesthetic property of the watch appearance pieces. The coating can be divided into a metal coating and a non-metal coating according to the components, and can be divided into a chemical deposition coating (chemical deposition layer, namely chemical plating layer), an electrodeposition coating (electrodeposition layer, namely electroplating layer) and a vacuum plating coating (vacuum plating layer). Common stainless steel surface treatment methods include electrodeposition, chemical deposition, paint spraying, vacuum coating and the like, and electrodeposition, chemical deposition and paint spraying are gradually replaced by environment-friendly technical methods, such as vacuum coating technology, because of great environmental hazards and non-compliance with the requirements of green technology.
Reference is made to the peel test (tape test) and the scratch test (scribe and scribe test) in GB/T5270-2005, methods for testing the adhesion strength of a metal coating on a metal substrate by electrodeposition and chemical deposition, which is described in the text. The peel test (tape test) consists in using a fibrous adhesive tape (for example a 3M adhesive tape as is currently used in the watchman industry) with an adhesion value of about 8N per 25mm width, in applying the adhesive face of the tape to the cover layer to be tested by means of a roller of fixed weight, and in carefully removing all air bubbles, in applying a steady pulling force on the tape perpendicular to the surface of the cover layer after a spacing of 10s, in order to pull off the tape, without detaching the cover layer if the adhesion strength of the cover layer is high, the area of the cover layer being greater than 30mm2. The scratch test (scribe and grid test) was performed by scribing two parallel lines at a distance of about 2mm using a hard steel scribe knife with a 30 ° sharpened edge, and when scribing two parallel lines, scribing one line at a time with sufficient pressure, that is, cutting through the cover layer to the base metal, and if the cover layer at any portion between the lines is peeled off from the base metal, the cover layer was considered to have failed the test; another test was to scribe the grid to 1mm and observe whether the overlay in this area peeled off the base metal.
As described above, the adhesion strength of the vacuum plating layer on the surface of the watch appearance member is measured by a peel test and a scratch test with reference to the measurement means of the adhesion strength of the electroless plating layer and the plating layer. However, the nature of the vacuum plating layer is substantially different from that of the metal covering layers of the electrodeposition and the chemical deposition (for example, the compactness and the adhesion of the vacuum plating layer are far superior to those of the electrodeposition and the chemical deposition layers, the vacuum plating layer is thin, the thickness of the plating layer is between 0.01 μm and 5.00 μm, and the thickness of the electrodeposition and the chemical deposition layers is generally more than 5.00 μm), so that the detection method for detecting the adhesion strength of the vacuum plating layer on the surface of the stainless steel watch appearance piece by adopting the electrodeposition and chemical deposition metal covering layer adhesion strength is not scientific yet.
In addition, the watch metal appearance piece has a complex and fine structure, is difficult to directly detect by adopting a peeling test (a tape test) and a scratch test (a marking and lattice test), and can indirectly detect the vacuum coating on the surface of the stainless steel watch appearance piece by preparing a stainless steel sheet sample in the same furnace. Thus, the detection result is only used for reference and is unreliable.
Disclosure of Invention
In view of the above, it is necessary to provide a method for detecting the adhesion strength of a vacuum plating layer on the surface of a watch exterior part, in order to solve the problem that no direct and effective method for detecting the adhesion strength of a vacuum plating film is available at present.
The above purpose is realized by the following technical scheme:
a method for detecting the adhesion strength of a vacuum coating on the surface of a watch appearance piece comprises the following detection steps:
deforming the sample to be detected, wherein the sample to be detected is annular;
and observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not and whether coating scraps exist or not, wherein if the vacuum coating at the position with the highest deformation degree is not stripped and the coating scraps do not exist, the detection result is qualified.
In one embodiment, the step of deforming the sample to be detected specifically includes the following steps:
cutting a fracture on a sample to be detected;
and respectively acting on two sides of the fracture of the sample to be detected by using external force so as to deform the sample to be detected.
In one embodiment, in the step of respectively acting on two sides of the fracture of the sample to be detected by using external force to deform the sample to be detected, the external force acting mode includes:
and simultaneously applying external forces which are opposite in direction and perpendicular to the plane of the sample to be detected to two sides of the fracture of the sample to be detected so as to enable the two sides of the fracture of the sample to be detected to rotate by a first preset angle.
In one embodiment, the first predetermined angle is 90 ° to 180 °.
In one embodiment, the first predetermined angle is 90 °.
In one embodiment, the method for detecting the vacuum coating peeling and coating chipping of the sample to be detected at the position with the highest deformation degree comprises the following steps of:
on the basis that the two side parts of the fracture of the sample to be detected rotate by a first preset angle, external forces in the same direction are continuously applied to the two side parts of the port of the sample to be detected, so that the two side parts of the fracture of the sample to be detected rotate to a second preset angle.
In one embodiment, the second preset angle is greater than 90 degrees and equal to or less than 180 degrees.
In one embodiment, the second predetermined angle is 180 °.
In one embodiment, on the basis that the two side portions of the fracture of the sample to be detected rotate by a first preset angle, the method further includes the following steps of continuously applying external forces in the same direction to the two side portions of the port of the sample to be detected, so as to enable the two side portions of the fracture of the sample to be detected to rotate to a second preset angle:
and observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not and whether coating scraps exist or not, wherein if the vacuum coating at the position with the highest deformation degree is not stripped and the coating scraps do not exist, the detection result is excellent.
In one embodiment, in the step of observing whether the vacuum coating at the position with the strongest deformation degree of the sample to be detected is stripped, the observation mode is to observe through a 3-time magnifying lens.
The method for detecting the adhesion strength of the vacuum coating on the surface of the watch appearance piece can directly detect the watch appearance piece, and judges whether the watch appearance piece is qualified or not by enabling the watch appearance piece sample to be detected to deform and observing whether the vacuum coating at the position with the strongest deformation degree is stripped or not and whether coating scraps exist or not. Therefore, the detection result obtained by the detection method is obtained by directly detecting and judging the formed watch appearance piece, and the detection method is more reliable. And the detection method is simple and convenient to implement.
Drawings
FIG. 1 is a flowchart illustrating a method for detecting adhesion strength of a vacuum coating on a watch case according to an embodiment of the present invention;
FIG. 2 shows a detailed step of step S100 of FIG. 1;
fig. 3 is a flowchart of a method for detecting adhesion strength of a vacuum plating layer on a watch exterior according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the following describes in detail the method for detecting the adhesion strength of the vacuum plating layer on the surface of the watch appearance piece according to the present invention by using an embodiment and with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
The watch appearance piece refers to a watch case, a watch upper sleeve or a specially-made steel ring (such as a watch buckle) and the like. As shown in fig. 1, a method for detecting adhesion strength of a vacuum plating layer on a surface of a watch exterior piece according to an embodiment of the present invention includes the following steps:
s100, deforming a sample to be detected, wherein the sample to be detected is annular;
s200, observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not and whether coating scraps exist or not, and if the vacuum coating at the position with the highest deformation degree is not stripped and the coating scraps do not exist, judging that the detection result is qualified.
Wherein, the sample of waiting to detect, the wrist-watch outward appearance piece sample of waiting to detect promptly, its deformation mode can be many, for example: the sample to be detected can be folded in half, twisted, bent and deformed, and the like. Only the sample to be detected is deformed.
In addition, there are various ways of observing whether the vacuum plating layer is peeled off at the most deformed position, and preferably, the observation is performed by using a 3-time magnifying glass.
Further, whether the vacuum plating layer is peeled off from the portion having the highest degree of deformation can be judged by observing whether or not there is any defect such as peeling, bubbling, or peeling. The specific operation of observing whether the vacuum coating at the position with the highest deformation degree has the coating scraps can be to wipe the vacuum coating at the position with a finger and observe whether the finger is stained with the coating scraps.
In addition, the ring shape of the sample to be detected can be a regular shape such as a circle, a square, a pentagon, an ellipse and the like, and can also be an irregular shape such as a Mickey mouse outline, a flower-shaped outline and the like. Of course, the sample to be detected may be in the form of a closed loop or a non-closed loop. If the ring is not closed, the fracture does not need to be cut additionally (as mentioned in the following specific steps), and the non-closed part of the non-closed ring is the fracture.
In the current clock industry, the base material of the watch appearance piece is generally made of stainless steel (such as 316 and 304 stainless steel) which is corrosion-resistant and has excellent performance. The vacuum coating comprises (1) a golden coating series which takes a golden TiN or rose-like TiCN hard nonmetal coating as a bottom layer and takes a gold and alloy metal coating as a surface layer: 1N (light gold), 2N (light gold), 3N (gold), 4N (pink) and 5N (rose gold) gold or rose gold coatings. (2) C, Ti doped or C, Cr doped black non-metallic plating. (3) Titanium oxide series colored non-metallic coatings (purple, blue, iridescent, etc.). (4) Si and Cr are doped and CrN is a silver white hard nonmetal coating (the Vickers hardness of the surface is 900HV 0.01/10-1800 HV 0.01/10). (5) Diamond-like carbon (DLC film or coating for short) having an ultra-high surface vickers hardness. (6) A hard golden non-metal plating layer which takes golden ZrN as a main component, and the like. In the present clock industry, the vacuum plating layer for the watch appearance piece has a metal plating layer, a nonmetal plating layer and a composite plating layer combining the metal plating layer and the nonmetal plating layer.
Therefore, the sample to be tested in this embodiment may be a watch appearance piece sample that uses a stainless steel substrate as a substrate and is coated with a vacuum coating on the outside of the stainless steel substrate. In this embodiment, the sample to be tested comprises a stainless steel substrate and a vacuum coating layer coated on the stainless steel substrate. When the sample to be detected is deformed by using an external force, metal atoms or molecules in the stainless steel matrix are extruded and deformed, and atoms or molecules in the vacuum coating attached to the surface of the stainless steel matrix are extruded and deformed along with the metal atoms or molecules in the stainless steel matrix. The stainless steel substrate has excellent ductility, so that the stainless steel substrate cannot be cracked during deformation, and the detection result cannot be interfered, so that the adhesion strength of the vacuum coating can be detected only by observing the adhesion condition of the vacuum coating after deformation. The detection method is direct, rapid and simple to operate, and is suitable for detecting the adhesion strength of the vacuum coating layer.
Referring to fig. 2, as an implementable manner, the step of deforming the sample to be detected in step S100 specifically includes the following steps:
s110, cutting a fracture on a sample to be detected;
and S120, respectively acting external force on two sides of the fracture of the sample to be detected so as to deform the sample to be detected.
In this embodiment, the external force may be applied in various ways, for example: the sample to be detected is pulled to be linear from the ring shape by external force, and the like, so long as the sample to be detected is deformed. The preferable external force action mode is that external forces which are opposite in direction and perpendicular to the plane of the sample to be detected are simultaneously applied to two side parts of the fracture of the sample to be detected, so that the two side parts of the fracture of the sample to be detected rotate relative to each other by a first preset angle.
The external force action mode can enable the whole sample to be detected to be subjected to distortion deformation, wherein the part, with the strongest deformation degree, of the sample to be detected is approximately positioned on the opposite side of the fracture. In the process that a sample to be detected is subjected to distortion deformation under the action of external force, metal atoms or molecules in the stainless steel matrix can be extruded and deformed uniformly and sufficiently, so that the vacuum coating attached to the stainless steel matrix is extruded and deformed uniformly and sufficiently. Therefore, this method can improve the reliability of detection. If the thickness of the vacuum plating layer on the surface is too thick (more than 3 μm), the compactness is poor, and the adhesion force is poor, the vacuum plating layer will be peeled off or even fall off from the surface of the stainless steel substrate during twisting, i.e. the adhesion strength of the vacuum plating layer is not qualified or good.
In other embodiments, the external force may also be applied by fixing a part on one side of the fracture and applying an external force perpendicular to the plane of the sample to be detected to the part on the other side of the fracture, so that the two sides of the fracture of the sample to be detected rotate relative to each other by a first preset angle.
The first preset angle can be any angle as long as the sample to be detected can be deformed, and preferably the first preset angle is 90-180 degrees. Through long-term repeated tests and verification of the inventor, the qualified sample is detected when the first preset angle is 90 degrees, and the adhesion strength of the vacuum coating can basically ensure the quality requirement of the watch appearance piece.
Referring to fig. 3, as an implementable manner, after the step S200 of observing whether the vacuum coating at the position with the strongest deformation of the sample to be detected is peeled off or not and whether coating scraps exist or not, and if the vacuum coating at the position with the strongest deformation is not peeled off and the coating scraps do not exist, the step of detecting that the result is qualified further includes the following steps:
s300, on the basis that the two side parts of the fracture of the sample to be detected rotate by a first preset angle, external forces in the same direction are continuously applied to the two side parts of the port of the sample to be detected, so that the two side parts of the fracture of the sample to be detected rotate to a second preset angle. Wherein the second preset angle is greater than 90 degrees and less than or equal to 180 degrees. Preferably, the second preset angle is 180 °.
It should be noted that the external force in step S300 is specifically applied in a manner that, on the basis that the external forces with opposite directions and perpendicular to the plane of the sample to be detected are simultaneously applied to the two sides of the fracture of the sample to be detected, so that the two sides of the fracture of the sample to be detected rotate relative to each other by a first preset angle, the external forces are continuously applied to the two sides of the fracture, and the two sides of the fracture rotate continuously in the direction of the relative rotation.
For example, assume that the first preset angle is 90 ° and the second preset angle is 180 °. The specific operation steps may be to rotate one side of the fracture clockwise by 45 degrees and rotate the other side counterclockwise by 45 degrees. Then, one side part of the fracture, which rotates 45 degrees clockwise, continues to rotate 45 degrees clockwise, and the other side part of the fracture, which rotates 45 degrees counterclockwise, continues to rotate 45 degrees counterclockwise.
In step S300, on the basis that the two side portions of the fracture of the sample to be detected rotate by the first preset angle, the external forces in the same direction are continuously applied to the two side portions of the port of the sample to be detected, so that the two side portions of the fracture of the sample to be detected rotate to the second preset angle, and after the step of:
s400, observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not and whether coating scraps exist or not, wherein if the vacuum coating at the position with the highest deformation degree is not stripped and the coating scraps do not exist, the detection result is excellent.
During specific implementation, whether the watch appearance sample is qualified or not can be checked by firstly twisting the watch appearance sample by 90 degrees, and if the watch appearance sample is qualified, the watch appearance sample is continuously twisted to 180 degrees to check whether the watch appearance sample is excellent or not. Therefore, unqualified watch appearance piece samples can be removed firstly during detection. Then, a good watch appearance sample is detected on the basis of the qualified sample, so that the watch appearance sample is conveniently classified, and the detection efficiency is improved.
For the sake of enhanced understanding, several detection embodiments (in which the sample to be detected is assumed to be a closed loop) are given below.
Example 1
And randomly drawing 100 samples to be detected from the watch appearance piece products of the first batch for detecting the adhesion strength of the vacuum plating layer. And shearing the sample to be detected into a fracture by using a shearing tool. External forces which are opposite in direction and perpendicular to the plane of the sample to be detected are applied to the two side parts of the fracture of the sample to be detected respectively, so that the two side parts of the fracture of the sample to be detected rotate relative to each other by a first preset angle which is 90 degrees. And observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not by using a 3-time magnifier, wherein the vacuum coating at the position with the highest deformation degree of the sample to be detected is not stripped, and the vacuum coating at the position with the highest deformation degree of the sample to be detected is rubbed by fingers to observe whether the fingers are stained with coating scraps or not. And if the vacuum coating at the position with the highest deformation degree of the sample to be detected is not peeled and coating scraps are not generated, the detection result is qualified.
And (3) enabling 100 samples to be detected in the first batch to meet the qualified requirements, using the products in the first batch according to the normal use strength, and tracking and recording for a long time. The result shows that the vacuum plating layer of the batch of products has good adhesion strength, and 98.0 percent of vacuum plating layers of the products are normally adhered to the stainless steel matrix for more than 3 years.
Example 2
And randomly drawing 100 samples to be detected from the watch appearance piece products of the second batch for detecting the vacuum plating adhesion strength. And shearing the sample to be detected into a fracture by using a shearing tool. External forces which are opposite in direction and perpendicular to the plane of the sample to be detected are applied to the two side parts of the fracture of the sample to be detected respectively, so that the two side parts of the fracture of the sample to be detected rotate relative to each other by a first preset angle which is 90 degrees. And observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not by using a 3-time magnifier, and observing whether the coating scraps are adhered to the fingers or not by rubbing the vacuum coating at the position with the highest deformation degree of the sample to be detected by using the fingers. And if the vacuum coating at the position with the highest deformation degree of the sample to be detected is not peeled and coating scraps are not generated, the detection result is qualified.
The twisting is continued to a second preset angle on the basis of the first preset angle, namely the 90-degree twisting, and the second preset angle is 180 degrees. And observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not by using a 3-time magnifier, and observing whether the coating scraps are adhered to the fingers or not by rubbing the vacuum coating at the position with the highest deformation degree of the sample to be detected by using the fingers. If the vacuum coating at the position with the highest deformation degree of the sample to be detected is not peeled off and coating scraps are not generated, the detection result is excellent.
And (3) the 100 samples to be detected in the second batch meet the excellent requirements, and the products in the second batch are used according to the normal use strength and are tracked and recorded for a long time. The result shows that the vacuum plating layer of the batch of products has good adhesion strength, and 99.5 percent of vacuum plating layers of the products are normally adhered to the stainless steel matrix for more than 5 years.
Example 3
And randomly drawing 100 samples to be detected from the watch appearance piece products of the third batch for detecting the adhesion strength of the vacuum plating layer. And shearing the sample to be detected into a fracture by using a shearing tool. External forces which are opposite in direction and perpendicular to the plane of the sample to be detected are applied to two side parts of the fracture of the sample to be detected respectively, so that the two side parts of the fracture of the sample to be detected rotate relative to each other by a first preset angle, and the first preset angle is 120 degrees. And observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not by using a 3-time magnifier, and observing whether the coating scraps are adhered to the fingers or not by rubbing the vacuum coating at the position with the highest deformation degree of the sample to be detected by using the fingers. And if the vacuum coating at the position with the highest deformation degree of the sample to be detected is not peeled and coating scraps are not generated, the detection result is qualified.
And (4) enabling 100 samples to be detected in the third batch to meet the qualified requirements, using the products in the third batch according to the normal use strength, and tracking and recording for a long time. The result shows that the vacuum plating layer of the batch of products has good adhesion strength, and 98.9 percent of vacuum plating layers of the products are normally adhered to the stainless steel matrix for more than 3.5 years.
Example 4
And randomly drawing 100 samples to be detected from watch appearance piece products of the fourth batch for detecting the adhesion strength of the vacuum plating layer. And shearing the sample to be detected into a fracture by using a shearing tool. External forces which are opposite in direction and perpendicular to the plane of the sample to be detected are applied to two side parts of the fracture of the sample to be detected respectively, so that the two side parts of the fracture of the sample to be detected rotate relative to each other by a first preset angle which is 180 degrees. And observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not by using a 3-time magnifier, and observing whether the coating scraps are adhered to the fingers or not by rubbing the vacuum coating at the position with the highest deformation degree of the sample to be detected by using the fingers. And if the vacuum coating at the position with the highest deformation degree of the sample to be detected is not peeled and coating scraps are not generated, the detection result is qualified.
And (4) enabling 100 samples to be detected in the fourth batch to meet the qualified requirements, using the products in the fourth batch according to the normal use strength, and tracking and recording for a long time. The result shows that the vacuum plating layer of the batch of products has good adhesion strength, and 99.3 percent of vacuum plating layers of the products are normally adhered to the stainless steel matrix for more than 4.5 years.
Example 5
And randomly drawing 100 samples to be detected from watch appearance piece products of the fifth batch for detecting the adhesion strength of the vacuum plating layer. And shearing the sample to be detected into a fracture by using a shearing tool. External forces which are opposite in direction and perpendicular to the plane of the sample to be detected are applied to the two side parts of the fracture of the sample to be detected respectively, so that the two side parts of the fracture of the sample to be detected rotate relative to each other by a first preset angle which is 90 degrees. And observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not by using a 3-time magnifier, and observing whether the coating scraps are adhered to the fingers or not by rubbing the vacuum coating at the position with the highest deformation degree of the sample to be detected by using the fingers. And if the vacuum coating at the position with the highest deformation degree of the sample to be detected is not peeled and coating scraps are not generated, the detection result is qualified.
The twisting is continued to a second preset angle, which is 150 °, on the basis of the first preset angle, i.e. the 90 ° twist. And observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not by using a 3-time magnifier, and observing whether the coating scraps are adhered to the fingers or not by rubbing the vacuum coating at the position with the highest deformation degree of the sample to be detected by using the fingers. If the vacuum coating at the position with the highest deformation degree of the sample to be detected is not peeled off and coating scraps are not generated, the detection result is excellent.
And (4) all the 100 samples to be detected in the fifth batch meet the excellent requirements, and the products in the fifth batch are used according to the normal use strength and are tracked and recorded for a long time. The result shows that the vacuum plating layer of the batch of products has good adhesion strength, and 99.0 percent of vacuum plating layers of the products are normally adhered to the stainless steel matrix for more than 4 years.
According to the embodiment, the method for detecting the adhesion strength of the vacuum coating on the surface of the watch appearance piece can be directly used for detecting the adhesion strength of the vacuum coating on the surface of the watch appearance piece, the detection is simple and rapid, the detection result is reliable, and the blank of detecting the adhesion strength of the vacuum coating on the surface of the watch appearance piece is filled.
Example 6
And respectively producing watch appearance piece products of a sixth batch and a seventh batch under the same process flow and conditions. And randomly drawing 100 samples to be detected from watch appearance piece products of the sixth batch, and detecting the adhesion strength of the vacuum coating by using the detection method provided by the invention.
And shearing the sample to be detected into a fracture by using a shearing tool. External forces which are opposite in direction and perpendicular to the plane of the sample to be detected are applied to the two side parts of the fracture of the sample to be detected respectively, so that the two side parts of the fracture of the sample to be detected rotate relative to each other by a first preset angle which is 90 degrees. And observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not by using a 3-time magnifier, and observing whether the coating scraps are adhered to the fingers or not by rubbing the vacuum coating at the position with the highest deformation degree of the sample to be detected by using the fingers. And if the vacuum coating at the position with the highest deformation degree of the sample to be detected is not peeled and coating scraps are not generated, the detection result is qualified.
When a seventh batch of watch appearance piece products are prepared, 100 stainless steel sheet samples in the same furnace with the seventh batch of watch appearance piece products are prepared simultaneously, and the 100 stainless steel sheet samples are subjected to vacuum plating adhesion strength detection by adopting a traditional peeling test (a tape test) or a scratch test (a scribing and lattice test).
Specifically, the adhesive surface of the 3M adhesive tape can be attached to the vacuum coating of the stainless steel sheet sample by a 3M adhesive tape with a fixed weight roller, and carefully removing all air bubbles, and after 10s, a stable pulling force perpendicular to the surface of the vacuum coating is applied to the 3M adhesive tape to pull off the 3M adhesive tape, and the 3M adhesive tape is qualified if the vacuum coating is not separated.
Or, a hard steel scratch knife which is ground into a sharp edge of 30 degrees is adopted to scratch two parallel lines with a distance of about 2mm or 1mm on the surface of the stainless steel sheet-shaped sample which is coated with the vacuum coating. When two parallel lines are scribed, the base metal is cut through the vacuum coating by scribing at a time with sufficient pressure to pass if the vacuum coating does not peel from the base metal in any portion between the lines.
And all the 100 samples to be detected in the sixth batch meet the qualified requirements, and all the 100 stainless steel sheet-shaped samples meet the qualified requirements. And using the products of the sixth batch and the seventh batch according to the normal use intensity and tracking and recording for a long time. The result shows that the vacuum plating layer of the sixth batch of products has good adhesion strength, and 98.0 percent of vacuum plating layers of the products are normally adhered to the stainless steel matrix for more than 3 years. The vacuum plating adhesion strength of the seventh batch of products is poor, and the service life of 87 percent of products is only 1 year.
Example 7
And respectively producing the watch appearance piece products of the eighth batch and the ninth batch under the same process flow and conditions. And randomly extracting 100 samples to be detected from the watch appearance piece products of the eighth batch, and detecting the adhesion strength of the vacuum coating by using the detection method provided by the invention.
And shearing the sample to be detected into a fracture by using a shearing tool. External forces which are opposite in direction and perpendicular to the plane of the sample to be detected are applied to the two side parts of the fracture of the sample to be detected respectively, so that the two side parts of the fracture of the sample to be detected rotate relative to each other by a first preset angle which is 90 degrees. And observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not by using a 3-time magnifier, and observing whether the coating scraps are adhered to the fingers or not by rubbing the vacuum coating at the position with the highest deformation degree of the sample to be detected by using the fingers. And if the vacuum coating at the position with the highest deformation degree of the sample to be detected is not peeled and coating scraps are not generated, the detection result is qualified.
The twisting is continued to a second preset angle on the basis of the first preset angle, namely the 90-degree twisting, and the second preset angle is 180 degrees. And observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not by using a 3-time magnifier, and observing whether the coating scraps are adhered to the fingers or not by rubbing the vacuum coating at the position with the highest deformation degree of the sample to be detected by using the fingers. If the vacuum coating at the position with the highest deformation degree of the sample to be detected is not peeled off and coating scraps are not generated, the detection result is excellent.
When a ninth batch of watch appearance piece products are prepared, 100 stainless steel sheet-shaped samples in the same furnace with the ninth batch of watch appearance piece products are prepared simultaneously, and the 100 stainless steel sheet-shaped samples are subjected to vacuum plating adhesion strength detection by adopting a traditional peeling test (a tape test) or a scratch test (a scribing and grid test).
Specifically, the adhesive surface of the 3M adhesive tape can be attached to the vacuum coating of the stainless steel sheet sample by a 3M adhesive tape with a fixed weight roller, and carefully removing all air bubbles, and after 10s, a stable pulling force perpendicular to the surface of the vacuum coating is applied to the 3M adhesive tape to pull off the 3M adhesive tape, and the 3M adhesive tape is qualified if the vacuum coating is not separated.
Or, a hard steel scratch knife which is ground into a sharp edge of 30 degrees is adopted to scratch two parallel lines with a distance of about 2mm or 1mm on the surface of the stainless steel sheet-shaped sample which is coated with the vacuum coating. When two parallel lines are scribed, the base metal is cut through the vacuum coating by scribing at a time with sufficient pressure to pass if the vacuum coating does not peel from the base metal in any portion between the lines.
And all 100 samples to be detected in the eighth batch meet excellent requirements, and all 100 stainless steel sheet-shaped samples meet qualified requirements. And using the products of the eighth and ninth batches according to the normal use intensity and tracking and recording for a long time. The result shows that the vacuum plating layer of the eighth batch of products has good adhesion strength, and 99.6 percent of vacuum plating layers of the products are normally adhered to the stainless steel substrate for more than 5 years. The ninth batch had poor vacuum adhesion strength, and 89% of the products were used for only 1 year.
According to the embodiment, the method for detecting the adhesion strength of the vacuum coating on the surface of the watch appearance piece is more reliable than the traditional detection method, meanwhile, the detection is simple and rapid, the detection result is more reliable, and the blank of detecting the adhesion strength of the vacuum coating on the surface of the watch appearance piece is filled.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A method for detecting the adhesion strength of a vacuum coating on the surface of a watch appearance piece is characterized by comprising the following detection steps:
cutting a fracture on a sample to be detected; simultaneously applying external forces which are opposite in direction and perpendicular to the plane of the sample to be detected to two side parts of the fracture of the sample to be detected so as to enable the two side parts of the fracture of the sample to be detected to rotate for a first preset angle, wherein the sample to be detected is annular;
and observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not and whether coating scraps exist or not, wherein if the vacuum coating at the position with the highest deformation degree is not stripped and the coating scraps do not exist, the detection result is qualified.
2. The method for detecting the adhesion strength of the vacuum plating on the surface of the exterior watch piece according to claim 1, wherein the first predetermined angle is 90 ° to 180 °.
3. The method for detecting the adhesion strength of the vacuum plating on the surface of the watch appearance piece according to claim 2, wherein the first preset angle is 90 °.
4. The method for detecting the adhesion strength of the vacuum plating on the surface of the watch appearance piece according to claim 2, wherein the first predetermined angle is 180 °.
5. The method for detecting the adhesion strength of the vacuum coating on the surface of the watch appearance piece according to claim 2, wherein whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is peeled off or not and whether coating scraps exist or not is observed, and if the vacuum coating at the position with the highest deformation degree is not peeled off and the coating scraps do not exist, the detection result is qualified, and the method further comprises the following steps:
and continuously applying external forces in the same direction to the two sides of the port of the sample to be detected on the basis that the two sides of the fracture of the sample to be detected rotate by the first preset angle, so that the two sides of the fracture of the sample to be detected rotate to a second preset angle.
6. The method for detecting the adhesion strength of the vacuum plating on the surface of the watch appearance piece according to claim 5, wherein the second predetermined angle is greater than 90 degrees and equal to or less than 180 degrees.
7. The method for detecting the adhesion strength of the vacuum plating on the surface of the watch appearance piece according to claim 6, wherein the second predetermined angle is 180 °.
8. The method for detecting the adhesion strength of the vacuum coating on the surface of the watch appearance piece according to claim 5, wherein on the basis that the two side parts of the fracture of the sample to be detected are rotated by the first preset angle, external forces in the same direction are continuously applied to the two side parts of the port of the sample to be detected, so that the two side parts of the fracture of the sample to be detected are rotated to a second preset angle, the method further comprises the following steps:
and observing whether the vacuum coating at the position with the highest deformation degree of the sample to be detected is stripped or not and whether coating scraps exist or not, wherein if the vacuum coating at the position with the highest deformation degree is not stripped and the coating scraps do not exist, the detection result is excellent.
9. The method for detecting the adhesion strength of the vacuum plating on the surface of the watch appearance piece according to claim 1 or 8, wherein in the step of observing whether the vacuum plating at the position where the deformation degree of the sample to be detected is the strongest is peeled, the observation mode is observation through a 3-time magnifier.
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