illustration of corrosion mechanisms (IMAGE) Penn State Caption Researchers found that corrosion mechanisms differ in dimensions from three to two to one. In 1D, the corrosion partially runs along the grain boundaries of the metal material. Credit Yang Yang/Penn State. Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.