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The adhesion between coating and a flat metal surface hasbeen investigated by measurements. The setup is based on theformation of a blister by injecting nitrogen gas under pressurebetween the coating and the substrate. The adhesion energy isdetermined by recording the pressure as a function of therecorded blister radius development. A laser is moved over theblister in 2D with two programmable step engines to measurethe blister profile and thereby the radius of the blister betweensuccessive pressure increases. The design and operation of theinstrument are described and an evaluation of its performanceand limitations is given. The method could be useful for accuratemeasurement of adhesion of many types of surface coatings tometal and, possibly, to other substrates, as well as for studies ofthe various factors that influence adhesion. A better accuracy ofthe laser for measuring the blister profile would improve thesetup.We treated aluminium surfaces in different manners (sandpaper, polishing and blowing using glass particles) but found nosignificant impact on the adhesion energy between the x-linkedcoating layer and the metal. The adhesion energy measurementshowever have a large scatter. The coating layer that was not xlinkedhad a much lower adhesion energy.

Blister Test as Method of Measuring Adhesion of Solids on a Flat Surface