Surface Modification of Metallic Inserts for Enhancing Adhesion at the Metal-Polymer Interface

Area of Science:

• Materials Science
• Surface Engineering
• Adhesion Science

Background:

• Enhancing metal-polymer adhesion is crucial for high-performance adhesive joints.
• Surface modification techniques are vital for improving interfacial strength.
• Understanding the interplay between surface texture and adhesion is essential.

Purpose of the Study:

• To investigate the combined effects of mechanical and chemical treatments on copper and duralumin surface modification.
• To enhance adhesion at the metal-polymer interface for high loadbearing capacity.
• To establish the relationship between surface geometry parameters and adhesive joint strength.

Main Methods:

• Mechanical pretreatment using sandblasting.
• Chemical etching with various mixtures.
• Surface texture evaluation using scanning electron microscopy (SEM) and optical confocal microscopy.
• Measurement of surface geometry parameters (Sa, Sz, Sdr).

Main Results:

• Purely mechanical treatments yielded poor loadbearing capacity.
• Combined treatments resulted in a ninetyfold (copper) and hundredfold (duralumin) increase in failure force.
• A critical surface roughness threshold, achieved through mechanical pretreatment, was identified as crucial.

Conclusions:

• A synergistic approach combining mechanical and chemical surface treatments is highly effective for enhancing metal-polymer adhesion.
• Optimizing surface roughness through mechanical pretreatment is paramount for maximizing the benefits of subsequent chemical treatments.
• The findings provide a pathway for designing robust adhesive joints with superior loadbearing capabilities for copper and duralumin components.