Atmospheric corrosion resistance of steel sheet coated with 5% Al-Zn plus mischmetal

Steel sheets with an alloy coating composed of 5% Al-Zn plus a trace of mischmetal (5% Al-Zn + MM) is reported to be more resistant to atmospheric corrosion than conventional galvanized sheet. This article gives the results of 12 years of outdoor corrosion testing in severe marine, moderate marine, industrial, and rural environments. These results indicate that there is no significant difference between the atmospheric durability of 5% Al-Zn + MM and a conventional glavanized coating of the same thickness.