29 research outputs found
Performance Evaluation Effect of Nb2O5 Particulate on the Microstructural, Wear and Anti-corrosion Resistance of Zn–Nb2O5 Coatings on Mild Steel for Marine Application
In this study, we developed Zn–Nb2O5 composite
coatings from sulfate bath for wear and corrosion performance
on mild steel by electrodeposition technique. The
effect of Nb2O5 particulate on the Zn–Nb2O5 properties was
investigated. The particle volume fraction was varied within
between 10 and 20 wt%. The structural properties of the
composite coatings were characterized using scanning
electron microscope equipped with energy-dispersive spectrometer.
The hardness and wear of the composite coating
were measured with diamond base microhardness indenter
tester and sliding CETR reciprocating wear testers, respectively.
The corrosion properties were examined in 3.65%
NaCl using AUTOLAB 101 Metrohm potentiostat–galvanostat
with linear polarization technique. The results
showed that average hardness value of 192.6 and 200.6 HV
and passivation potential of 4.39E?08 and 5.30E?08(X)
were obtained for the 10–20 wt% Nb2O5 particulate on the
Zn–Nb2O5 coatings. The wear performance improves by
63.4% as against the control sample. In all, this study
established that up to 20 wt% of Nb2O5 in Zn–Nb2O5 composite coating significant corrosion, wear and microhardness
propagation resistance of mild steel was attained
Surface modification, strengthening effect and electrochemical comparative study of Zn-Al2O3-CeO3 and Zn-TiO2-CeO3 coating on mild steel
Surface enhancement of engineering materials is
necessary for preventing service failure and corrosion attacks
industrially. The surface modification, strengthening effect
and electrochemical comparative study of Zn-Al2O3-CeO3
and Zn-TiO2-CeO3 coating on mild steel was investigated.
Deposition was performed to obtain a better surface adherent
coating using the electrodeposition technique. Co-deposition
of mild steel resulted into surface modification attributes to
the complex alloys that were developed. Films of mild steel
were electrodeposited on zinc electrodes using the chloride
bath solutions. The effect of deposition potentials was systematically
studied using a focus ion beam scanning electron
microscope (FIB-SEM) and an atomic force microscope
(AFM) to observe the surface morphology, topography and
the surface adherent properties of the coatings. The elemental
composition and the phases evolved in composite coatings were measured by means of the energy dispersed
spectrometer (EDS). The microhardness measurements and
corrosion behaviours of the deposits were investigated.
Weight loss measurement was conducted on the plated samples
to observe the rate of corrosion and it was observed that
there was severe corrosion on the controlled sample in comparison
to the plated samples and that Zn-TiO2-CeO3
resisted more corrosion attacks
Effect of WO3 Nanoparticle Loading on the Microstructural, Mechanical and Corrosion Resistance of Zn Matrix/TiO2-WO3 Nanocomposite Coatings for Marine Application
In this study, for marine application purposes, we
evaluated the effect of process parameter and particle loading on
the microstructure, mechanical reinforcement and corrosion
resistance properties of a Zn-TiO2-WO3 nanocomposite produced
via electrodeposition. We characterized the morphological
properties of the composite coatings with a Scanning Electron
Microscope (SEM) equipped with an Energy Dispersive
Spectrometer (EDS). We carried out mechanical examination using
a Dura Scan hardness tester and a CERT UMT-2 multi-functional
tribological tester. We evaluated the corrosion properties by linear
polarization in 3.5% NaCl. The results show that the coatings
exhibited good stability and the quantitative particle loading greatly
enhanced the structural and morphological properties, hardness
behavior and corrosion resistance of the coatings. We observed the
precipitation of this alloy on steel is greatly influenced by the
composite characteristics