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 encounter 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 inward, ultimately causing the metal to crumble. However, the red rust that forms on copper (Cu₂O) has some ability to prevent corrosion from water and seawater, which is why 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 referred to as "dry corrosion" because it does not involve water. Since black rust (Fe₃O₄) does not erode inward, it can actually suppress red rust by covering it. The black rust (Ag₂S) that forms on silver items such as tableware and accessories occurs due to a "sulfide reaction," where sulfur components found in skin and hair bind to silver. This black rust also does not erode inward. Continues to basic information ↓
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"White Rust" Chemical formula: Al₂O₃, 2ZnCO₃, 3Zn(OH)₂ Target metals: Aluminum, Zinc The whitish discoloration of 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 deeply and has corrosion resistance. White rust on aluminum (Al₂O₃) can destroy the protective oxide film on the surface and may corrode internally, so caution is needed. "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 corrosion. For information on "Green Rust," "Yellow Rust," and "Brown Rust," please see the related links below.
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Turning your troubles into good experiences for our customers. We respond to such customer requests. From "nothing" to "something." Creating "one-of-a-kind" products instead of "mass production." Harada Iron Works is dedicated to fulfilling your desires. To meet the diverse needs of our customers, we provide a consistent production service from material procurement to painting and installation, assisting in reducing lead times and total costs. With over 70 years of experience, we are committed to providing even greater "high added value" to our products through the skills and know-how we have honed over the years. If you have any inquiries regarding production or painting, please feel free to contact us. We look forward to hearing from you. For blasting and painting, leave it to us. Harada Iron Works Co., Ltd. Hiroshima TEL: 082-232-2445 FAX: 082-293-0286 Contact: Tao Mobile: 090-3742-9768 Email: bousei@harada-tekkou.co.jp Please feel free to contact us for consultations or estimates.
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Our company manufactures products tailored to the diverse needs of various sites. We respond to customer requests with our capabilities, advantageous 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, establishing a solid technology and facilities as a "rust prevention department," and we also perform tasks such as paint stripping. Please feel free to contact us with any requests.
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