Failure type and precautions of the adhesion of the pull-opening method

Types of failure and precautions for the adhesion of the pull-off method Generally, three types of failures may occur in the pull-off test on the metal display wheel base:
(1) Bonding failure: After the tension is applied, the rubber layer is pulled off from the coating or the test puller, or its internal internal pull-off is considered to be the failure of the adhesive. The adhesion between the coating and the substrate or coating and the wire bar coater of the coating will exceed this value.
(2) Adhesion failure: that is, the coating and the substrate are separated under tension, and this value is the adhesion of the coating to the substrate.
(3) Cohesive failure: The coating itself is broken. This value is used as the value of the adhesion between the layers. The adhesion of the coating to the substrate exceeds this value. For each type of coating, there is a prescribed pull-off method, generally required to be greater than 2 MPa, and a two-component loop level meter oxygen coating large vibrometer at 4 MPa.
Precautions:
The adhesion is closely related to the pretreatment of the substrate surface, the construction method and the maintenance of the coating. If the conditions permit, it is best to spray the surface of the column to achieve the required cleanliness and roughness. Use as soon as possible within 3 h of sand.

Through the inspection of this project, the composition of the coating can be checked by an electronic balance, especially if the use of the resin is reasonable.
The adhesion of the paint film directly affects the protective ability of the paint on the substrate, so the paint adhesion index is very important for the paint. The adhesion of the paint film depends not only on the selected coating base, but also on the surface pretreatment of the substrate, the construction method and the maintenance of the film, for example, in wet, rusty, greased metals. Surface coating, adhesion is poor.

For more information on the adhesion tester, please visit: http://
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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