EP2087345A2 - Procédé d'évaluation d'un revêtement d'après des tests mécaniques - Google Patents

Procédé d'évaluation d'un revêtement d'après des tests mécaniques

Info

Publication number
EP2087345A2
EP2087345A2 EP07820125A EP07820125A EP2087345A2 EP 2087345 A2 EP2087345 A2 EP 2087345A2 EP 07820125 A EP07820125 A EP 07820125A EP 07820125 A EP07820125 A EP 07820125A EP 2087345 A2 EP2087345 A2 EP 2087345A2
Authority
EP
European Patent Office
Prior art keywords
coating
substrate
mechanical stress
infrared image
infrared
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07820125A
Other languages
German (de)
English (en)
Inventor
Thomas Brinz
Jane Lewis
Markus Tiefenbacher
Thomas Geiger
Tobias Burk
Eva Wagner
Sebastian Koltzenburg
Wolfgang Schrof
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
BASF SE
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE, Robert Bosch GmbH filed Critical BASF SE
Publication of EP2087345A2 publication Critical patent/EP2087345A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/72—Investigating presence of flaws

Definitions

  • the invention relates to a method for evaluating mechanical tests on a coating on a substrate.
  • coatings are e.g. Paints on different surfaces such as e.g. Metals, plastics, glass, wood, etc.
  • the tested mechanical properties are e.g. Liability, elasticity, hardness, scratch resistance or stone chip resistance of the paint.
  • the characterization of many test methods by the visual assessment of damage, which takes place by a defined, mechanical load. For example, the adhesion of a paint is usually tested with a cross-cut test. The evaluation is usually done by the visual inspection and classification by the examiner.
  • the evaluation is carried out by the examiner, which means that the methods are rather empirical methods.
  • the evaluation depends on clear color differences. Evaluations of glossy or matt clearcoats on glossy or matt metal substrates are limited by the small color differences. A coloration of the clearcoat by admixture of fluorescent dyes or other dyestuffs.
  • fluorescent dyes or other dyestuffs For visualization can change by interaction with the paint or a component of the paint, such as the initiator, the curing and / or the other paint properties.
  • solubility effects due to precipitation of the dye during the polymerization and associated effects on the structure of the paint layer must be taken into account.
  • a coating often performs several tests, the results could be changed by the addition of the dye.
  • the method according to the invention for evaluating mechanical tests of a coating on a substrate comprises the following steps:
  • step (b) isothermal clamping of the substrate with the coating and taking an infrared image of the area in which the mechanical stress is applied to the coating in step (a),
  • the infrared recording measures the infrared emission at a constant temperature. Due to the different emissivities of different materials different signals are recorded when measuring the infrared intensity. At the points where the paint has peeled off in the mechanical test, the emission intensity of the substrate is measured, for coatings that adhere to the substrate, the emission of the coating is measured. Advantage of the method is thus that no empirical estimation must be made due to the different emission properties. In addition, it is also possible to automatically test the properties of clearcoats.
  • the mechanical stress is impressed, for example, in the form of an elasticity test or a bonding test of the coating.
  • the imprinting of the load takes place according to the known methods, as currently used and empirically evaluated. the.
  • the mechanical stress in step (a) can be impressed on the coating, for example by cutting, impact, impact, tension or pressure.
  • the mechanical stress imparted in step (a) is e.g. a cross-cut, a penetration recess or a Erichsentiefung. Furthermore, the mechanical stress can also be applied by a falling ball or by bending the substrate provided with the coating around a mandrel, wherein the coating is arranged on the side of the substrate facing away from the mandrel.
  • parallel side-by-side cuts are made in the coating which are rotated 90 ° to the first cuts.
  • six adjacent cuts are generally introduced.
  • the distance between two parallel cuts is in each case the same size, so that by cutting into the paint 25 squares arise.
  • the treated surfaces are brushed off or removed with adhesive tape.
  • the quality of the adhesion of the coating is determined by the amount of coating material that flakes off due to penetration of the cuts and is removed by scrubbing or peeling off with adhesive tape.
  • a specimen generally a hardened, polished steel ball with a diameter of 20 mm at a uniform feed rate of about 0.2 mm / sec. pressed into the back of the substrate.
  • the back side of the substrate is the side of the substrate which lies opposite the coating. The advancing movement of the specimen is stopped as soon as the first crack occurs in the surface of the coating.
  • the imposition of the mechanical stress on the coating in step (a) and the establishment of the infrared image in step (b) take place simultaneously.
  • the infrared absorption is preferably an infrared film which is produced continuously during the application of the mechanical load.
  • the simultaneous application of the mechanical stress to the coating and the creation of the infrared image is preferred performed on all mechanical tests where a change in the coating must be detected during the test.
  • step (a) In the case of mechanical tests in which an evaluation of the coating is carried out only after mechanical stress has been completed, it is sufficient that the mechanical stress is first impressed in step (a) and then the infrared image is taken in step (b).
  • the methods in which the optical assessment is made only after the application of the mechanical stress are e.g. the mechanical tests used to check the adhesion of the coating to the substrate.
  • the evaluation of the infrared image is performed by an electronic image processing system.
  • the advantage of the evaluation by an electronic image processing system is that subjective impressions of the examiner are not taken into account in the evaluation. An objective evaluation of the test is possible.
  • Another advantage of the evaluation by an electronic image processing system is that the method according to the invention is suitable for a series test in which a large number of coatings are automatically tested.
  • a mechanical load is applied to a coating. Due to the mechanical stress, a substrate on which the coating is applied can be at least partially exposed by detachment of the coating. However, it is also possible that under defined conditions under which the load is imposed, no damage to the coating takes place. This is possible, for example, with paints of high quality.
  • a coating is, for example, a coloring lacquer or a clear lacquer, which is applied to the substrate.
  • the coating can also be a plastic layer, a ceramic layer or a powder coating, which is applied to the substrate. In addition, it is also possible that the coating is a film which is adhered to the square.
  • the coating can also be a vapor-deposited or electrochemically deposited layer if the infrared emission is different from the substrate.
  • a layer is, for example, a phosphating, as it is carried out for rust prevention in metallic surfaces, or a metal coating on a plastic substrate.
  • the substrate is preferably a plate.
  • the material of the substrate is e.g. a metal, a plastic, glass or ceramic. There is no limitation of the materials for the substrate. It is only necessary to ensure that the emission properties for infrared light from coating and substrate are different.
  • a second step S2 the substrate is clamped isothermally with the coating formed thereon.
  • the isothermal clamping avoids that different regions of the substrate with the coating formed thereon, which in each case have different temperatures, emit the infrared radiation differently and thus errors in the image evaluation are made.
  • isothermal clamping is understood to mean that both the holder for clamping and the substrate and the coating as well as the surrounding air have a substantially identical temperature. Essentially the same temperature means here that the temperature difference is not greater than 1 K.
  • step Sl and step S2 i. first clamp the substrate with the coating and then apply the mechanical stress to the coating.
  • a third step S3 an infrared image of the area is created in which the mechanical stress has been impressed on the coating in step Sl. Due to the different emissivities for infrared radiation of different materials The areas in which no coating material is left on the substrate can be detected on the infrared image.
  • step S3 Since the emission properties for infrared radiation of a material differ depending on the temperature, it is necessary that the infrared image is formed in step S3 under isothermal conditions. With temperature differences in the coating or in the substrate, it would otherwise be possible to interpret warmer or colder areas as areas in which there is no longer any coating on the substrate, although the coating in this area is in order. On the other hand, it would of course also be possible that the area with a different temperature in the infrared image gives the impression that at this point the coating is in order, even though there is no longer any coating on the substrate.
  • the substrate has only a small thickness, since then sets a homogeneous temperature distribution in the substrate faster.
  • the substrate with the coating In order to avoid already being affected by the handling of the substrate with the coating when applying the mechanical stress temperature differences, it is preferred to first clamp the substrate with the coating and then exert the mechanical stress on the substrate. This is e.g. avoided that the substrate is heated by holding by the examiner at the points where the examiner contacts the substrate.
  • the acquisition of the infrared image in step S3 can take place simultaneously with the imposition of the mechanical load in step S1 or only after the imposition of the load in step S1.
  • the creation of the infrared image takes place only after the imprinting of the load. This is possible if changes in the coating occur due to the application of the load, but it is not necessary to record the time of the changes.
  • the creation of the infrared image in step S3 after imposing the mechanical stress is possible, for example, when carrying out a cross-hatch to check the adhesion of the coating, a mandrel bending test to determine the bending elasticity or also a ball impact test to determine the impact and impact elasticity.
  • the substrate with the coating formed thereon is bent around a conically shaped mandrel. Subsequently, the diameter is determined at which the coating has cracks or peels off.
  • a ball is dropped onto the coating. The ball is dropped onto the coating from different drop heights until the first signs of cracking or detachment are visible in the coating. It is thus possible to drop the ball first, then to create an infrared image and to repeat this so often until a crack or a detachment of the coating can be detected on the infrared image.
  • a test is e.g. an Erichsentiefung for testing the flexural elasticity of the coating.
  • Erichsentiefung is e.g. by means of a plunger, a hardened, polished steel ball with a diameter of 20 mm as long as at a uniform feed rate of about 0.2 mm / sec. pressed into the back of the substrate formed as a sample plate until a first crack in the coating shows.
  • the distance traveled by the pestle is read as the depth value. For this reason, it is important to know exactly when the first crack occurs in the coating. Therefore, it is necessary to make an infrared photograph of the area of the coating at short intervals, which is loaded by the Erichsentiefung while the test is performed. Most preferably, the infrared images are taken in such a short distance that an infrared film is produced.
  • step S4 After creating the infrared image, it is evaluated in step S4.
  • the evaluation is preferably carried out substantially simultaneously with the creation of the recording.
  • the evaluation of the infrared image in step S4 can be carried out optically by an examiner or automated by an image processing system.
  • Advantage of the image processing system is that the evaluation is objective. A subjective influence of the examiner is excluded.
  • any image processing system known to those skilled in the art can be used. It is only necessary that color differences are detected by the image processing system.
  • the image analysis of the infrared image can be done either as a color image, wherein the recording is preferably decomposed into the individual color channels or it will evaluate the gray value images.
  • the result is the percentage of area in% that the coating has exfoliated.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

L'invention concerne un procédé d'évaluation d'un revêtement sur un substrat d'après des tests mécaniques, en appliquant dans une première étape (S1), une charge mécanique sur le revêtement ; en encastrant, dans une deuxième étape (S2), le substrat dans le revêtement isotherme ; en établissant, dans une troisième étape (S3), une prise de vue en infrarouge de la zone dans laquelle la charge mécanique a été appliquée sur le revêtement dans la première étape (S1), et en évaluant, dans une quatrième étape (S4), la prise de vue en infrarouge. L'invention concerne également un dispositif pour mettre en oeuvre le procédé.
EP07820125A 2006-10-31 2007-09-11 Procédé d'évaluation d'un revêtement d'après des tests mécaniques Withdrawn EP2087345A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006051895A DE102006051895A1 (de) 2006-10-31 2006-10-31 Verfahren zur Bewertung von mechanischen Prüfungen einer Beschichtung
PCT/EP2007/059520 WO2008052835A2 (fr) 2006-10-31 2007-09-11 Procédé d'évaluation d'un revêtement d'après des tests mécaniques

Publications (1)

Publication Number Publication Date
EP2087345A2 true EP2087345A2 (fr) 2009-08-12

Family

ID=39273156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07820125A Withdrawn EP2087345A2 (fr) 2006-10-31 2007-09-11 Procédé d'évaluation d'un revêtement d'après des tests mécaniques

Country Status (4)

Country Link
US (1) US8717440B2 (fr)
EP (1) EP2087345A2 (fr)
DE (1) DE102006051895A1 (fr)
WO (1) WO2008052835A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8751457B2 (en) * 2012-01-01 2014-06-10 Bank Of America Corporation Mobile device data archiving
CN108072577A (zh) * 2018-02-08 2018-05-25 水利部产品质量标准研究所 一种热喷涂涂层抗冲击韧性检测装置及测试方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2001289914A1 (en) * 2000-09-25 2002-04-02 Sensovation Ag Image sensor device, apparatus and method for optical measurements
EP1450155A1 (fr) * 2001-11-19 2004-08-25 The Circle for the Promotion of Science and Engineering Methode et systeme d'analyse thermique
US8182719B2 (en) * 2003-06-11 2012-05-22 Yeda Research And Development Company Ltd. Pyroelectric compound and method of its preparation
FR2866119B1 (fr) * 2004-02-05 2006-09-15 Snecma Moteurs Procede de mesure de l'adherence d'un revetement sur un substrat
US20070044397A1 (en) * 2005-08-09 2007-03-01 Wiercinski Robert A Skid resistant surfaces

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
WO2008052835A2 (fr) 2008-05-08
DE102006051895A1 (de) 2008-05-21
US8717440B2 (en) 2014-05-06
WO2008052835A3 (fr) 2008-06-19
US20100149339A1 (en) 2010-06-17

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