ASTM D6677 PDF

Designation: D – 01Standard Test Method for Evaluating Adhesion by Knife1 This standard is issued under the fixed desig. From ASTM D Standard Test Method for Evaluating Adhesion by Knife. Section 3 | Summary of Test Method. Adhesion is determined by making an “ X”. Buy ASTM D Standard Test Method for Evaluating Adhesion by Knife from SAI Global.

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Knife adhesion tests may be used to assess the bond to the substrate when the tape adhesion test results revealed a break somewhere higher up in the coating system.

The test was developed for assessing the adhesion of coating to steel, but can be used on other hard substrates.

It is correct this affirmation? Variations in temperature and humidity can affect the efficacy of the method employed. For coatings up to 2.

August 8, at 8: August 22, at Its a dd6677 concern. In order to be successful a coating system has to have both good tensile and shear adhesion.

That is, coatings generally do not disbond from a substrate or other coating as a result of forces that are exerted perpendicular to the surface. This includes personalizing content and advertising. By continuing to use our site, you accept our use of cookies To learn more, click Read More to view our Privacy and Cookies Policy. If the tape adhesion test is required, the chalking should be removed from the area prior to performing the test.

Coating Adhesion Testing Using Knife/Tape MethodsKTA University

Generally, adhesion aatm of 4 and 5 are considered good, adhesion values of 2 and 3 are considered marginal and adhesion values of 0 and 1 are considered poor. Eugen, The following comes from the author: See DD and D It is the to ensure straight cuts. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

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There are circumstances and situations that do not allow standard procedures and methods to provide an accurate representation of coating adhesion.

Adhesion testing may be a requirement of a coating specification, or may be used for coating system performance qualification in a laboratory. Keywords 1 length of at least 6. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

Standard Test Method for Evaluating Adhesion by Knife

Leave this field empty. The adhesion by knife test may provide a more accurate picture of the actual adhesion characteristics.

Once the incisions are made, a pressure sensitive tape with adhesive properties conforming to the requirements of the standard; Figure 1 is applied over the incisions and pressed in place using a pencil eraser. Tape and knife adhesion exert a prying type of force. Recently, have seen hubs in service within one year showing heavy signs of spots, blisters, etc due to coatings applied at low temperatures at the construction stage.

ASTM D – pdf全文-研究报告-在线文档

Leave a Reply Cancel reply Your email address will not be published. Adhesion testing is also a valuable indicator for determining the integrity of coating systems that have been in service for extended periods of time, may require maintenance, and overcoating is a strategy being considered; and is frequently used during coating failure investigations.

Table 1 provides the evaluation criteria for Method A; Table 2 provides the evaluation criteria for Method B. The standard also contains a pictorial guide to aid in the rating of the cross-cut Method B. This article discusses tape and knife adhesion test methods performed according to standardized ASTM International. A description of the adhesion criteria is included in Table 3. Tensile adhesion tests exert a force perpendicular to the coating system.

Adhesion testing conducted on acrylic elastomeric coatings applied to cement or stucco cannot be evaluated using the tape adhesion test. The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

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Your email address will not be published. While tape and knife adhesion tests are generally regarded as more subjective than their tensile pull-off adhesion test counter parts, the tape and knife adhesion tests can be much more revealing of the true adhesion properties of a coating system.

It is important to evaluate the coated surface and not the back of the tape, since coating debris from the incisions is often removed by the tape. The tip of a knife blade is then inserted into the intersect of the two incisions and used to attempt to lift the coating from the substrate or an underlying coating.

Summary of Test Method tions. April 7, at 6: If you feel that your comments have xstm received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

Coating Adhesion Testing using Knife/Tape Methods

When appropriate, the nature and location of the separation is documented. Test Specimen bility of regulatory limitations prior to use. Report Current edition approved May 10, A number in parentheses indicates the year of last reapproval.

Simply stated, the ASTM standard test procedures have limitations that need to be considered when making judgements or decisions based on the test results. Inspection Instruments Pipeline Coatings — Volume 2: Tensile pull-off adhesion is the subject of an article by Melissa Swogger that is also available on the KTA University site.

The values given in parentheses are for information 5.