aluminium in commercial vehicles - European Aluminium Association

130 EUROPEAN ALUMINIUM ASSOCIATION ALUMINIUM IN COMMERCIAL VEHICLES CHAPTER IX
1. Adhesive bonding
1.1. Definition
Adhesive bonding is defined as
a process of joining parts using a
non-metallic substance (adhe-
sive) which undergoes a physical
or chemical hardening and by
thus leading to a joining of the
parts through surface forces
(adhesion) and internal forces
(cohesion).
Adhesion can be physical attraction
between the adhesive and
the metal surface, real chemical
bonding between the adhesive
molecules and the metal atoms
or mechanical interlocking
between the adhesive and the
surface roughness of the metal.
Cohesion is the inner strength
of the adhesive itself as a result
of physical and/or chemical
forces between the components
of the adhesive.
Physical attraction forces
between adhesive and
metal surface
Source: Talat lectures
PRINCIPLE OF ADHESIVE BONDING
ADHESION
FIGURE IX.1
Chemical bonding
between adhesive
molecules and metal
atoms
Physical and/or chemical interaction
between the adhesive molecules
Mechanical interlocking
between adhesive and
surface roughness of
the parts to be joined
COHESION