What Does Tape Adhesion Test Mean?
The tape adhesion test method uses pressure-sensitive tape to determine the adhesion quality of a coating. In order for corrosion-resistant coatings to perform properly, they must adhere to the surface on which they are applied, and the tape adhesion test can determine whether or not a coating is properly adhering to its substrate.
ASTM D3359 is known as the Standard Test Method for Measuring Adhesion by Tape Test.
Corrosionpedia Explains Tape Adhesion Test
The tape adhesion test has two methods, which can be performed either in laboratories or at job sites.
The X-cut tape test is used at job sites. Using a razor blade, knife or other sharp cutting tool, two cuts are made all the way through the coating down to the substrate to form an "X," with a 30- to 45-degree angle between legs. Tape is placed at the center of the "X" and then quickly removed. The area is then examined to see if any coating has been removed.
The cross-hatch tape test is conducted in a laboratory on coatings less than 125 microns thick. It uses a cross-hatch pattern, which is created using a cutting guide or a special cross-hatch cutter with preset blades, helping to ensure that incisions are parallel to each other and properly spaced. After the tape has been applied and peeled off, the area is examined and rated.
After any failed test, it is important to record whether the bond failure was adhesive (at the coating/substrate interface) or cohesive (within the coating film or the substrate).