Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Mass corrosion index of the external (a), middle (b) and bottom (c) layer of the metallic multilayer material at different diameters (d, mm) of an artificial lens, diameter of an artificial pitting of 1 mm and exposure time of 720 h (curve 1) and 2,208 h (curve 2).
