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.
Still, no message was permitted on the address side. The term âPost Cardâ was not widely used until the early 1900s (it was later contracted to postcard as a word-counting, cost-saving measure). Real Photo Post Cards (1900 to 1995) Post cards that are actual photographic replications were first produced around 1900.