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.
Today in History. 1860 - Around midnight, the First Pony Express rider arrived in San Francisco with mail that originated in St. Joseph, Missouri. The first rider left St Joseph at the sound of cannon fire at 7:15 p.m., on Apr. 3 with a pouch that contained 49 letters, five telegrams and miscellaneous papers. 1865 - John Wilkes Booth shot President Abraham Lincoln at a play at Fordâs Theater in Washington, DC.