The answer is ‘No’. Brass can’t rust because rust is a condition that affects only iron and iron alloys. Rust results from the effect of oxygen and moisture on iron, which creates iron oxide. This is the familiar, flaky reddish-brown compound that attacks and corrodes the metal. Brass is an alloy of copper and zinc. It does not contain iron and therefore has none of its vulnerability.
Why does brass lose its colour?
Brass does tarnish, which can be mistaken for rusting. This is caused by oxidation, a process in which the copper and zinc elements react with oxygen and moisture in the air. Oxidation produces a thin surface layer of copper oxide and zinc oxide, which causes the metal to darken or develop a pinkish or greenish patina. Because coastal regions and urban areas can contain high levels of salt, sulphur and acidic compounds, tarnishing can occur relatively quickly.
Although both conditions look unsightly, it is only rust that causes damage. Tarnishing is a largely aesthetic problem. In the sheet metal fabrication industry, specialists like https://dkmsheetmetal.co.uk are keenly aware of the problem of oxidation and have developed a number of measures to prevent it. There are also simple actions that can be undertaken by end users.
How to reverse or prevent it
You can remove tarnishing by polishing it or cleaning it with mild solutions like lemon juice and baking soda. To prevent it, keep the brass dry, apply protective coatings like lacquer or carnauba wax and don’t use abrasive cleaners.
Simple care can preserve the lustrous finish of brass for decades.
