How does concrete’s pH level affect adjacent metal components in sculptures?
Concrete’s high alkalinity, with a pH typically between 12 and 13, plays a critical role in the longevity of adjacent metal components in sculptures. Initially, this alkaline environment forms a passive oxide layer on metals like steel, protecting them from corrosion. However, over time, carbonation or exposure to chlorides can lower concrete’s pH, breaking down this protective layer and accelerating rust formation. For metals such as aluminum or copper, alkaline conditions may cause direct chemical reactions, leading to pitting or discoloration. To prevent damage, artists and conservators use protective coatings, stainless steel, or galvanized metals, and regularly monitor pH levels in concrete bases. Understanding this interaction is key to preserving sculptural integrity.
