{"id":22995,"date":"2024-03-12T15:27:01","date_gmt":"2024-03-12T13:27:01","guid":{"rendered":"https:\/\/fractory.com\/?p=22995"},"modified":"2024-03-12T15:38:35","modified_gmt":"2024-03-12T13:38:35","slug":"copper-corrosion","status":"publish","type":"post","link":"https:\/\/fractory.com\/copper-corrosion\/","title":{"rendered":"Copper Corrosion Explained"},"content":{"rendered":"

Copper is a widely used metal that possesses a unique combination of properties, such as being malleable, ductile, and conductive. Like any other metal, it undergoes a decomposition or oxidation process which involves physical and chemical changes.<\/p>\n

Now, let’s delve deeper into copper corrosion.<\/p>\n

Does Copper Rust or Corrode?<\/h2>\n

Corrosion is a natural process<\/a> that occurs as metals react with the atmosphere, chemicals, or other specific conditions. This transformation leads to a different appearance along with changes to the metal’s mechanical properties<\/a> and a weaker structural integrity. Copper forms a reddish-brown cuprous oxide layer<\/strong> during its electrochemical reaction with the environment.<\/p>\n

Rust forms when metal alloys containing iron undergo the oxidation process. However, copper is a non-ferrous metal<\/a>, meaning it doesn’t contain iron. As iron content is a prerequisite for the formation of rust, copper certainly does not rust, it corrodes or oxidises<\/strong> as oxygen molecules land on its surface and combine with copper atoms to form copper oxide.<\/p>\n

Unlike iron oxide, copper oxide does not disintegrate over time. It forms a protective film on the surface of the copper which gradually thickens until it becomes copper carbonate. This new layer of material, called patina, serves as a shield that preserves the unspoiled copper inside<\/strong>. What’s more, damaged patina regenerates itself.<\/p>\n

Copper corrosion is a slow process, especially in unpolluted environments. Therefore, it takes months or even years for the surfaces to tarnish and gradually turn dark brown or black and finally into a distinctive blue-green colour.<\/p>\n

The formation of patina can be forced<\/strong>, as for some applications a specific look is often desired while no one has the time to wait for the copper to achieve this look naturally. This is achieved by treating the copper surfaces with various chemicals or corrosive agents<\/strong>, such as ferric nitrate, sodium thiosulfate, and sulfuretted potash. By using different methods and exposing the copper to different temperatures and moisture levels, various shades and colours can be obtained.<\/p>\n

Some applications of copper are most efficient when the patina is removed altogether and copper is in its cleanest form. An example of this would be copper wires, which exhibit their most electrically conductive state without the patina. Wax coating, polishing, and solutions will seal copper from corroding agents<\/strong>, preventing it from oxidising and tarnishing.<\/p>\n

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