Are there different types of rust? Red rust, black rust, white rust, blue rust, green rust, yellow rust, brown rust.
Did you know that there are seven types of rust: "red rust," "black rust," "white rust," "blue rust," "green rust," "yellow rust," and "brown rust"?
"Red Rust" Chemical formula: Fe₂O₃, Cu₂O Target metals: Iron, steel, copper, copper alloys The "red rust" is something we often see in our daily lives. For red rust to occur, air and moisture are necessary, and corrosion begins through "ionization," which robs electrons from iron. As long as it is in contact with air and moisture, red rust (Fe₂O₃) will erode internally, ultimately causing the metal to crumble. However, the red rust that occurs on copper (Cu₂O) has some ability to prevent corrosion from water and seawater, so it is sometimes used as a raw material for ship bottom paint. "Black Rust" Chemical formula: Fe₃O₄, Ag₂S Target metals: Iron, silver This "black rust" is commonly seen on iron frying pans and cast iron skillets. It is generated by heating the target metal at high temperatures and is called "dry corrosion" because it does not involve water. Since black rust (Fe₃O₄) does not erode internally, it can actually suppress red rust by covering it. The black rust (Ag₂S) that occurs on silver items such as tableware and jewelry is caused by a "sulfide reaction," where sulfur components found in skin and hair bond with silver. This black rust also does not erode internally. Continues to basic information ↓
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"White Rust" Chemical formula: Al₂O₃, 2ZnCO₃, 3Zn(OH)₂ Target metals: Aluminum, Zinc The whitish discoloration seen on aluminum sashes and plated products is called "white rust." It is formed when in contact with moisture. The white rust of plating (2ZnCO₃, 3Zn(OH)₂) does not usually corrode internally and has corrosion resistance. White rust on aluminum (Al₂O₃) can destroy the protective oxide film on the surface and has the potential to corrode internally, so caution is advised. "Blue Rust" Chemical formula: CsSO₄, 3Cu(OH)₂ Target metal: Copper Also known as "verdigris," the green substance found on copper statues such as 10-yen coins and the Statue of Liberty is called "blue rust." It changes from red rust color to black-brown to verdigris through the combination of oxygen, carbon dioxide, and moisture. There is no internal corrosion, so covering with blue rust can prevent further corrosion. For information on "Green Rust," "Yellow Rust," and "Brown Rust," please see the related links below.
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Our company manufactures products tailored to the diverse needs of various sites. We respond to customer requests with our capabilities, excellent location, and thorough quality and delivery management. You can trust us with everything from material ordering to can manufacturing, processing, surface preparation, and painting. Additionally, we have dedicated many years to research and development in rust prevention, and we possess solid technology and equipment as a "rust prevention department," also handling tasks such as paint stripping. Please feel free to contact us with any inquiries.
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