How to improve the corrosion resistance and aesthetics of sheet metal boxes

Which method in surface treatment can best improve the corrosion resistance and aesthetics of sheet metal boxes? Here is the answer you want:
1. In terms of improving corrosion resistance:
Electrostatic powder coating+high-temperature curing (thermosetting powder coating): It can form a dense coating (such as fluorocarbon powder coating), especially suitable for harsh environments (chemical areas/beaches). The cured coating has excellent chemical stability and mechanical strength.
Electrophoretic coating (such as epoxy cloud iron intermediate paint+fluorocarbon topcoat): The coating is uniform without dead corners and has strong adhesion (better than traditional spraying), and the composite coating system can provide long-term corrosion protection.
Anodizing (limited to aluminum alloys): generates a dense aluminum oxide film (dyeable) that combines high hardness and corrosion resistance.
2. In terms of improving aesthetics:
Electroplating (such as chrome/nickel): provides a mirror gloss effect and is wear-resistant.
Wire drawing treatment (stainless steel/aluminum alloy): customizable texture (matte/striped), with anti fingerprint function.
Multi layer spraying (primer+topcoat): supports any color selection (such as RAL color card), and can be paired with a metallic texture effect.
Comprehensive optimal solution:
Aluminum casing → anodizing+dyeing (balancing corrosion resistance and color diversity)
Steel box body → electrophoretic primer+electrostatic powder coating (dual anti-corrosion+optional color)
High end demand → Electroplating+Transparent protective coating (high gloss+scratch resistant)
Note: The specific selection should be based on cost and usage environment (such as the need for additional conductive coatings for electromagnetic shielding).