Vidéos Test d'adhérence par traction

 

Les instruments de test d'adhérence par traction fournissent une valeur d'adhérence irréfutable ; ils sont parfaits pour une utilisation en laboratoire ou sur site. Les plots de traction (dollies) sont collés sur le revêtement ; une fois la colle sèche, on mesure la force nécessaire pour arracher le revêtement de la surface. La gamme d'instruments de test d'adhérence par traction Elcometer est conçue pour évaluer rapidement et précisément la force de cohésion entre le revêtement et le substrat.

 

 

Cliquez sur l'onglet Vidéo pour voir la Vidéo.

 

 

Liste de Vidéos Adhérence par traction

Elcometer 204 Steel Ultrasonic Material Thickness Gauge

      1. An Introduction to Pull-Off Adhesion on Coated Surfaces

        Adhesion testers are used to test how well a coating has adhered to a surface, as poor adhesion can lead to 
        premature coating failures. The coating inspector has essentially three main methods to choose from - cross
        hatch, push off, and the most common, the pull-off adhesion test.

 

Elcometer 204 Steel Ultrasonic Material Thickness Gauge

      2. Selecting the Dolly Diameter and Gauge

       
        When it comes to selecting the dolly diameter and adhesion gauge type to use for a pull-off adhesion test; 
        factors such as the substrate material, the substrate shape, and the expected coating strength will affect the 
        dolly or gauge the user chooses.

Elcometer 204 Steel Ultrasonic Material Thickness Gauge

      3. Selecting the most Appropriate Position for an Adhesion Test

        When preparing a pull-off adhesion test, whilst the actual location and the number of pulls is typically defined 
        by the test method or procedure that’s being followed, the actual positioning of the dolly is vital, as poor 
        positions can result in low pull-off values or invalid tests.

 

 

Elcometer 204 Steel Ultrasonic Material Thickness Gauge

      4. Preparing the Dolly and the Coating

          
        Properly preparing the dolly and the surface before performing a pull-off adhesion test will help achieve 
        higher pull-off values.

Elcometer 204 Steel Ultrasonic Material Thickness Gauge

      5. To Cut or Not to Cut?

       Should the coating around a dolly be cut, or left uncut prior to a pull-off adhesion test; and whose decision is
       it to make?

Elcometer 204 Steel Ultrasonic Material Thickness Gauge

      6. The Pull-Off Test

       Once the glue between a properly prepared dolly or pull stub and a properly prepared coating has fully 
       cured, the pull-off adhesion test can be undertaken using the adhesion tester of choice.

 

Elcometer 204 Steel Ultrasonic Material Thickness Gauge

      7. Assessing the Result; Glue, Adhesive and Cohesive Failures

        Once the pull-off adhesion test has been completed the tensile pull-off force, whether the coating was coat or 
        not, the dolly size and gauge type, and the failure mode of the coating are all recorded; with the nature of the
        failure usually recorded as an estimated percentage to the nearest 10%.

Elcometer 204 Steel Ultrasonic Material Thickness Gauge

      8. Measuring the Pull-Off Adhesion of Coatings on Concrete

        Testing coating adhesion on concrete substrates using a pull-off adhesion gauge is similar to testing coatings
        on metal substrates. However, there are a number of differences in the test procedures and equipment used.