Preparation of UPR/Cu-Zn-Al<sub>2</sub>O<sub>3</sub> Nanocomposite Coating for Mild Steel Corrosion Protection

Polymer coatings are thin layers of corrosion protection that can be applied to welded steel. Developing a polyester-based coating with metal fillers could assist homogeneous dispersion on weld surfaces. This study develops and characterizes the unsaturated polyester-Cu-Zn-Al 2 O 3 coating and its corrosion performance on the welded steel. Cu-Zn-Al 2 O 3 reinforcement was first milled at 40 h at 300 rpm, mixed with polyester to produce a film, and coated on welded steel. The results showed that milled consists of nanostructure and various particle distributions. The composition of the film consists of two distinct materials: amorphous polyester and crystalline Cu, Zn, and Al 2 O 3 . The ratio of these materials within the film influences its properties. The amount of filler in the polyester-Cu-Zn-Al 2 O 3 composite film was maximum at 2.0 wt%. The corrosion rate monitored from 5 to 20 days shows a consistent trend, with 2.0 wt% showing the highest corrosion resistance.