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.
The event that occurred on August 20 , 1986 , at the United States Post Office in Edmond was , at that time , the state 's largest and the nation 's third-largest mass murder committed by a single individual in a single incident ( the Federal Bureau of Investigation officially defines mass murder as murder of a minimum of four victims by a single ...