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Binary and
Ternary Nanoceramic Coating to Protect CarbonSteel in Artificial
Seawater |
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Binary
and Ternary nanoparticles coatings have been applied on carbon
steel using atomization method (cold spraying) to corrosion
control in seawater. Nanoparticles were included Nano Al 2 O 3 ,
SiC and ZrO 2. The characterization of coated surfaces has been
investigated by AFM and SEM in addition to calculate the coating
thickness. The binary coatings deal with 50%Al 2 O 3-50%SiC,
50%Al 2 O 3-ZrO 2 and 50%SiC-50%ZrO 2 , while the ternary
coating was 60%Al 2 O 3-20%SiC-20%ZrO 2. The results showed that
50%Al 2 O 3-50%SiC had the lowest thickness and most uniform
distribution in AFM and SEM due to closing in particle sizes.
Corrosion test achieved to estimate the corrosion resistance,
protection efficiency and porosity percentage which indicated
the role of Nano particle coating to corrosion control. These
data showed that the Nano 50% l 2 O 3-50%SiC coating had the
most noble corrosion potential, lowest corrosion current density
(lowest corrosion rate), highest corrosion resistance, highest
efficiency 99.651 % and lowest porosity percent 1.438×10-11.
Cyclic polarization also estimated to show the probability for
pitting corrosion. The coating with 50%Al 2 O 3-50%SiC gave the
highest breakdown potential equal to +69mV. INTRODUCTION hen
conferring .corrosion control by nanomaterial, there are two
main considerations. The first aspect is the .understanding of
corrosion behaviors of nanostructured materials; whether or not
.a nanostructured material possesses better corrosion resistance
(e.g., corrosion/oxidation/cracking resistance of a
.nanostructured steel .substrate/coating) when compared .with
the microstructure counterpart [1]. The second aspect is how
Nano sized materials can .be effectively employed in corrosion
prevention strategies (e.g., in an automobile or aerospace
coating), an area where nanotechnology corrosion control
benefits are considerable. Nano technological advancements are
.expected to improve corrosion monitoring and inspection
sectors[1]. Nanoparticle/nanostructured carriers have become a
major area of interest in developing .smart coatings with
'on-demand releasable' corrosion inhibitors and biocides [1].
Nanostructured ceramic (nanostructured .diamond, metal-ceramics,
hydroxyapatite, etc.) and composite coatings increase the
.general corrosion resistance of bio implants in addition to the
expected property enhancement of bioactivity and wear resistance
[2]. Nano coating was achieved by different technique [3].
Corrosion resistance of coating may be inferior with such
aggregation due to the accelerated diffusion of aggressive ions
along the |
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