Sammendrag
The adhesion between coating and a flat metal surface has
been investigated by measurements. The setup is based on the
formation of a blister by injecting nitrogen gas under pressure
between the coating and the substrate. The adhesion energy is
determined by recording the pressure as a function of the
recorded blister radius development. A laser is moved over the
blister in 2D with two programmable step engines to measure
the blister profile and thereby the radius of the blister between
successive pressure increases. The design and operation of the
instrument are described and an evaluation of its performance
and limitations is given. The method could be useful for accurate
measurement of adhesion of many types of surface coatings to
metal and, possibly, to other substrates, as well as for studies of
the various factors that influence adhesion. A better accuracy of
the laser for measuring the blister profile would improve the
setup.
We treated aluminium surfaces in different manners (sand
paper, polishing and blowing using glass particles) but found no
significant impact on the adhesion energy between the x-linked
coating layer and the metal. The adhesion energy measurements
however have a large scatter. The coating layer that was not xlinked
had a much lower adhesion energy.
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