Figure 9.
Surface micrographs of G4 sample: (a) initial, (b) after 9 days, (c) after 89 days, and (d) after 193 days of degradation.
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.