![]() One example is the Statue of Liberty, built in 1886. The result is that rust can eat away entire structures over time. It’s nothing like iron oxide, which flakes off, exposes new metal, which then rusts, then flakes off, etc. The thicker the copper oxide layer gets, the more it will resist further corrosion. It adheres really well to the base metal, and it’s pretty durable. But beyond cosmetics, there are some practical reasons why you might want it.įor one, this adds a protective layer to the metal.Ĭopper oxide is an interesting substance. Patina finishes are actually pretty popular for things like brass door handles, copper roofing, and other kinds of ornamental pieces. Bronze is composed of 88% copper and 12% tin.īoth of these metals have a really high copper content, which is why they form that same patina when they oxidize. The copper has reacted with oxygen, water, and carbon dioxide in the atmosphere.īrass is an alloy that’s usually made up of 67% copper and 33% zinc. When you see that green layer on these metals (usually called patina or verdigris) it’s because of a chemical reaction. That means that if there’s no iron, there’s no rust. Put simply, the most common copper oxide is green (yes, there are a few different kinds!).Ĭopper oxide is kind of like “rust”, although rust is the word that’s use to define iron oxide. How to Prevent Copper Oxide from Forming.Why Brass, Bronze and Copper Turn Green.
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