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 Constitution and the Post Office. In June 1788, the ninth state ratified the Constitution, which gave Congress the power âTo establish Post Offices and post Roadsâ in Article I, Section 8. A year later, the Act of September 22, 1789 (1 Stat. 70), continued the Post Office and made the Postmaster General subject to the direction of the President.