Adhesive
In the field of Tube and Pipe Metallurgy, the term "adhesive" often refers to the Interfacial Bonding Agents or specialized Adhesive Primers used to ensure the integrity of a secondary coating over a galvanized surface.
The chemical nature of a freshly galvanized surface is naturally "slick" due to its zinc-oxide layer, which can often be hostile to standard paints or polymers.
The Role of Adhesives in Galvanization
- Chemical Anchoring: In the manufacturing of high-end conduits, a chemical adhesive or a "tie-coat" is used. This layer acts as a molecular bridge, bonding to the metallic zinc on one side and the coating on the other.
- Preventing Delamination: Without high-performance adhesive primers, thermal expansion and contraction in extreme climates (like the UAE or Northern India) would cause the outer coating to peel away from the galvanized tube, leading to rapid sub-surface corrosion.
- Vibration and Impact Resistance: In heavy industrial piping, adhesives within the coating stack help absorb kinetic energy, ensuring that the protective shell does not crack when the pipe is handled or subjected to mechanical stress.