Figure 7.
Scanning electron microscopy (SEM) images of the surfaces of lightweight PC specimens after 50 d in sulfuric acid: (a) control specimen; (b) in pH 2.0 acid; (c) in pH 1.0 acid; (d) in pH 0.5 acid.
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.