Corrosion Test Results on Fifteen Ferrous Metals After Seven-Years Atmospheric Exposure

This is a progress report covering findings on the removal of ferrous corrosion specimens that had been exposed for seven years to the atmospheres of five different test sites, which included rural, marine, and industrial environments. The materials employed were ten malleable and pearlitic malleable irons, two ductile irons, and three rolled steels. Previous removals of companion sets of specimens had been made after one- and three-years' exposure. A final set is scheduled for removal in 1970 after twelve-years' exposure. The appearance of the corroded plates and weight losses were evaluated.