Galvanic corrosion is a process that degrades metals electrochemically. This corrosion occurs when two dissimilar metals are located in contact with each other in the presence of an electrolyte, such as salt water, forming a galvanic cell.
But the memories of that tragic day 25 years ago are still vivid to many in Edmond. On Aug. 20, 1986, gunman Patrick Henry Sherrill shot and killed 14 co-workers, wounded six and then took his own life inside the post office where he worked.
FILE: In this Aug. 1, 1966 file photo, smoke rises from the sniper's gun as he fired from the tower of the University of Texas administration building in Austin, Texas, on crowds below. ap Giving partial quotations, however, police said Whitman's notes told of hating his father with a mortal passion.