Rust Never Sleeps (2 of 2) (IMAGE) DOE/Sandia National Laboratories Caption A Sandia National Laboratories transmission electron microscope helped create this phase equilibrium map showing areas where corrosion of steel was observed at the triple junction formed where one cementite grain abuts two ferrite grains. Credit Katherine Jungjohann Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.