To answer the original question about corrosion resistance of Melonite, Tennifer, nitrocarburizing and any other names the process may go by, check the link below. It's a torture test someone decided to do with a Glock 21. There's some stuff not relating to the finish, but at one point the owner soaks the pistol in salt water. Reading the page should convince you. Continue past the initial salt water bucket test and check out the part with salt water soaked sock.

http://theprepared.com/content/view/90//administrator/

If 2nd amendment rights can be subject to licensing and fees, how was the poll tax unconstitutional?