In fact, there are several scientific mechanisms at play behind the scenes:


Mechanical interlocking: The adhesive leaks into the small holes and seams on the surface, locking both sides together like a "tenon".

Electrostatic attraction: Surfaces with positive and negative charges attract each other. In simple terms, it is "opposite charges attract".

Diffusion: Molecules mix at the interface, just like molecules on both sides holding hands, sticking together even tighter.

Chemical bonding: Further, strong covalent bonds, ionic bonds or hydrogen bonds are directly formed at the molecular level.

It is usually not a single cause, but rather these forces working together to make the surface "unbreakable".

Imagine two surfaces tightly adhering under pressure. When they start to slide, they will "stick" to each other, causing small debris on the surface to fall off and transfer to each other. Over time, this phenomenon is called "adhesive wear".

And it's not just a simple scratch on the surface. As time goes by,


It may also evolve into various "troublesome situations" :


1. Biting: The surface seems to be welded together. Forced tearing often causes the equipment to malfunction and shut down directly.

2. Scratches: Deep grooves appear on the contact path, causing a sharp increase in the coefficient of friction and a decrease in efficiency.

3. Jamming: The surface is stuck, making the part completely immobile, and it may also damage the bearing or sliding element.

4. Material transfer: Debris moves from one component to another, causing uneven wear or misalignment of precision parts.

5. Surface fatigue: Long-term exposure to repeated stress and micro-adhesion eventually leads to cracks and spalling, which is particularly common in high-cycle parts.

6. Pitting corrosion: After the adhesion is broken, small pits are formed, which grow larger under pressure, gradually making the surface more fragile.