Surface delamination in patinated bronze sculptures is a frequent issue that compromises both aesthetics and structural integrity. The primary causes include:

1. Environmental Exposure: Prolonged exposure to humidity, pollutants, or salt air accelerates corrosion, weakening the bond between the patina and bronze substrate.

2. Improper Patination Techniques: Inadequate surface preparation or incorrect chemical application during patination can lead to poor adhesion, causing the patina to flake over time.

3. Thermal Stress: Rapid temperature fluctuations cause expansion and contraction, creating micro-cracks that eventually result in delamination.

4. Mechanical Damage: Physical abrasion or improper handling can disrupt the patina layer, exposing the underlying metal to further degradation.

5. Inherent Material Defects: Impurities in the bronze alloy or uneven casting may create weak points where delamination initiates.

To mitigate these issues, regular maintenance, controlled environments, and professional restoration are essential for preserving patinated bronze sculptures. Understanding these causes helps collectors and conservators take proactive measures to protect these valuable artworks.