Astm d6677 pdf free download

This article discusses tape and knife adhesion test methods performed according to standardized ASTM International. 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.

Compliance concerns here maybe need further investigation before final releases. When appropriate, the nature and location of the separation is documented. After removal of the tape, the amount of coating removed from the substrate or underlying coating is rated. March 3, at Adhesion testing may be a requirement of a coating specification, or may be used for coating system performance qualification in a laboratory.

Your email address will not be published. Inspection Asym Pipeline Coatings — Volume 2: 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. 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. While tape and knife adhesion tests aastm 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.

Adhesion tests that consistently reveal an adhesive break between coats or a cohesive break within a coat do not provide any information relative to the adhesion of the coating or coating system asgm the substrate. By continuing to use our site, you accept our use of cookies To learn more, click Read More ast view our Privacy and Cookies Policy.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. Users v 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. Apparatus and Materials only. Adhesion asym that consistently reveal an adhesive break between coats or a cohesive break within a coat do not provide any information relative to the adhesion of the coating or coating system to the substrate.

Hi, You mention on this article that: 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. We use d to understand how you use our site and to improve your experience. Once the incisions are made, a pressure sensitive tape with d properties conforming to the requirements of the standard; Figure 1 is applied over the incisions and pressed in place using a pencil eraser.

The values given in parentheses are for information 5. Make each leg 1 of the angle a minimum of 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. Adhesion testing may be a requirement of a coating specification, or may be used for coating system performance qualification in a laboratory. The test has also been used successfully on softer substrates e.

Morales Agreda. A short summary of this paper. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

Scope the ordering information which should be complied with when 1. A minimum specific ratio of titanium additional control, testing, or examination is required to meet to carbon is specified. These include: 1. Within the text, the 3. SI units are shown in brackets. The values stated in each 3. Referenced Documents 4. Please fill this form, we will try to respond as soon as possible.

To reduce this effect, proper scoring and test fixture alignment techniques should be employed, and low loading rates should be avoided to reduce the time the elastomeric coating is under stress.

Arturo Zapana Mendoza Category: If the document is revised or amended, you will be notified by email.

Enter your personal account email address to request a password reset: The section now includes the following statement: It applies a perpendicular force to an attached loading fixture at a slow, constant rate; however, it uses hydraulic pressure to apply the force rather than pneumatic pressure. October 5, at 8: See DDDand D Since these adhesion testers do not operate identically, caution should be exercised when comparing results.

Coating is somewhat difficult to remove; chips ranging from approximately 3. In contrast, the more subjective knife and tape adhesion tests can be done quickly with a minimal amount of equipment. The following devices are in accordance with ECCA standards: The following devices are in accordance with ECE The following devices are in accordance with EN standards: Characterizing a test area based on an apparent low or high individual result should be done with caution.

The values given in parentheses are for information only.