The excellent corrosion resistance of Galvalume is owed to a combination of galvanic protection provided by the zinc coating protection by the mechanical aluminum barrier. The Galvalume steel is about 2 to 4 times more resistant to corrosion than galvanized steel.
|COATING LOSS (m)|
|ENVIRONMENT||Years of Exposure||(A) Conventional Zinc||(B)55% Al-Zn Alloy||A / B Ratio|
|Marine - Severe||2.5||16.8||5.2||3.2|