Some questions about brass rust and corrosion
Will brass rust?
Brass will rust. Brass is an alloy composed of copper and zinc. There are many types of brass. If not protected and maintained, it will rust. Different types have different degrees of rust. Among them, oxygen-free copper rusts slowly, while most bronzes and ordinary industrial pure copper (industrial red copper) brass are more susceptible to rust. Among them, H59 is the most susceptible to rust. This is determined by the characteristics of its ingredients.
Does brass perform well in applications involving water?
Generally speaking, brass is not the best metal for applications that require immersion underwater. It loses its zinc content in water, causing the metal to become less strong and durable. Therefore, the integrity of its purpose may be compromised.
Due to different compositions, some types of brass may be suitable for water applications. Navy brass, for example, contains about 40% zinc and about 1% tin to reduce dezincification. This makes it more resistant to salt water.
What is patina?
Patina is the color change that occurs in certain metals due to oxidation. This patina, or coating, builds up along the surface when the metal comes into contact with any deteriorating environmental factors, such as oxygen or water. Patina is usually different shades of blue and green.
Some people see a patina in brass and call it rust. But, as mentioned above, brass will not rust without iron. This discoloration is entirely due to oxidation. In fact, patina appears to protect metals from corrosion.
How to prevent brass alloy corrosion?
Applying a clear sealant to metals like brass can protect them from contact with natural elements that can cause corrosion. Oxidation occurs when the sealant wears or becomes compromised over time. For example, this process begins once the metal comes into contact with air or water.
After a few minutes, a patina will begin to form on the metal, protecting it from corrosion.
If the sealant is compromised, you can follow the correct method of removing the patina, cleaning, and resealing the metal.
