The study focused on investigating the
effectiveness of functional acrylic polymer (AP) in improving the ability of
airfoamed sodium silicate-activated calcium
aluminate/Class F fly ash cement (slurry density of ￡1.3 g/cm3) to mitigate the corrosion of carbon steel (CS)
after exposure to hydrothermal environment at 200?C or 300?C.
Hydrothermally-initiated interactions between the AP and cement
generated the formation of Ca-, Al-, or Na-complexed carboxylate derivatives
that improved the AP’s hydrothermal stability. A porous microstructure
comprising numerous defect-free, evenly distributed, discrete voids formed in
the presence of this hydrothermally stable AP, resulting in the increase in
compresive strength of cement. The foamed cement
with advanced properties conferred by AP greatly protected the CS against brine-caused
corrosion. Four major factors governed this protection by AP-incorporated
foamed cements: 1) Reducing the extents of infiltration and transportation of
corrosive electrolytes through the cement layer deposited on the underlying
CS surface; 2) Inhibiting the cathodic reactions at the corrosion site of CS;
3) Extending the coverage of CS by the cement; and 4) Improving the adherence
of the cement to CS surface.
The mixture consisted of benzotriazole (BTA), chitosan (CTS), polyacrylic acid and
zinc salt has
been investigated as a corrosion and scale inhibitor of
A3 carbon steel in cooling water. The scale and corrosion inhibition efficiency
was evaluated by static anti-scaling teat together with rotary coupon test.
Compared with the phosphorus corrosion and scale inhibitor, the corrosion inhibition rate
and scale inhibition rate of it increased respectively by 2.51% and 1.16%. As the corrosion and scale inhibitor
is phosphate-free, it won’t cause eutrophication, considering
the product performance and environmental influence, the phosphate-free corrosion and scale inhibitor is
superior to the traditional one.