ABSTRACT
Mittal has listed 355 techniques for measuring adhesion of films and coatings [ 1]. Since then, new techniques might have been added but the scratch test is still one of the most commonly used methods to evaluate the adhesion of thin films on solid substrates because of its easy operation, low price and wide applicability. However, the film detachment process in scratching is too complicated to be directly related to adhesion energy and other physically significant interface quantities. The ambiguity of the detachment process during scratching prevents a quantitative understanding of the scratching process [2].
