Adhesion (from Latin adhaerere 'Adhesion' or 'append') describes the adhesion between bodies of various kinds. The forces acting between atoms and molecules, the so-called molecular forces, are divided into two types: cohesive and adhesive forces.
The cohesive force causes the atoms and molecules one Body held together, z. B. bending a nail, the particles hold together. The greater the cohesive force of a body, the stronger it is (solid body = high cohesive force, liquids = lower cohesive force, gases = very small cohesive force).
Adhesive force refers to the attractive force between the particles different Body, z. B. Ink sticks to paper, chalk sticks to the board, glue sticks to wood. The strength of the adhesion forces depends on the respective substance. A particularly large adhesion force z. As adhesives, paints and varnishes.
Adhesion tendency refers to the degree of attraction between two different bodies. If there is talk of a large adhesion tendency, the two bodies adhere well to each other (eg paint on vehicle body). If one speaks of a low adhesion tendency, the two bodies adhere badly or not at all to each other. A low adhesion tendency therefore has a non-stick effect.
The goal of a surface coating which is to have an anti-adhesive effect is therefore the lowest possible adhesion tendency between the coating and the substances or media that touch it.