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.
Introduction. On April 20, 1999, two teens went on a shooting spree at Columbine High School in Littleton, Colorado, killing 13 people and wounding more than 20 others before turning their guns on themselves and committing suicide.