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Similar to many other bronze statues, the statue of Joseph of Portugal had an interventive conservation treatment. The conservation decision made to remove the patina most likely happened for two reasons. Firstly, it improves the visual impression of the statue; and secondly, the patina is a corrosive process slowly destroying the metal.
There is a chance that the water will leave mineral deposits in a white/tan crust-like fashion. That "crust" can cause damage or become more permanent if it comes in contact with the metal surface or a patina and needs to be periodically removed. There are different chemical treatments that can be used to control the levels of these factors.
Protective coatings can be good options for iron and steel objects. They help retain original appearance and protect against foreign bodies such as moisture and debris that can cause rust or corrosion. Clear coatings – Permalac [9] – Ormocer [10] – Paraloid B-72 [11]
In addition to explaining, antique experts also offer their tips for dealing with each on your collectibles.
The 6,000 or so separate components of the scaffold, made of a high load capacity aluminum (alloy 6061 T6), were unloaded onto Liberty Island on January 23, 1984. Aluminum was used to prevent possible rust stains from affecting the exterior patina of the statue. Screw jacks were used to brace the aluminum against the granite pedestal of the statue.
Electrolysis is a method that uses an electric current to create a chemical reaction that cleans the object and treats rust. Marine organisms such as limpets and molluscs can grasp on the metal surfaces and cause fouling corrosion—corrosion.
Patina is also found on slip rings and commutators. This type of patina is formed by corrosion, what elements the air might hold, residue from the wear of the carbon brush, and moisture; thus, the patina needs special conditions to work as intended. Patinas can also be found in woks or other metal baking dishes.
This incremental program would also become the model for preserving other lighthouse lanterns. When assessing the lantern, the USCG CEU encountered deteriorated lantern glass due to poor ventilation and corrosion of metal surfaces because of high levels of moisture. Rust inhibiting coatings were applied to the cast-iron posts.