129 research outputs found
Corrosion Resistance of AA6063-Type Al-Mg-Si Alloy by Silicon Carbide in Sodium Chloride Solution for Marine Application
The present work focused on corrosion inhibition of
AA6063 type Al-Mg-Si alloy in sodium chloride (NaCl) solution
with a silicon carbide inhibitor, using the potentiodynamic
electrochemical method. The aluminium alloy surface morphology
was examined, in the as-received and as-corroded in the
un-inhibited state, with scanning electron microscopy equipped
with energy dispersive spectroscopy (SEM-EDS). The results
obtained via linear polarization indicated a high corrosion potential
for the unprotected as-received alloy. Equally, inhibition efficiency
as high as 98.82% at 10.0 g/v silicon carbide addition was obtained
with increased polarization resistance (Rp), while the current
density reduced significantly for inhibited samples compared to the
un-inhibited aluminium alloy. The adsorption mechanism of the
inhibitor aluminium alloy follows the Langmuir adsorption
isotherm. This shows that the corrosion rate of aluminium alloy
with silicon carbide in NaCl environment decreased significantly
with addition of the inhibito
DNA from Plant leaf Extracts: A Review for Emerging and Promising Novel Green Corrosion Inhibitors.
With growing global awareness and concern for environmental protection through
the use of less hazardous and environmentally-friendly extracts of plant origin,
there has been a plethora of green corrosion inhibitors research with far reaching
contributions to the science of corrosion prevention and control. Attention has
increasingly turned towards green corrosion inhibitors, compounds of natural
origin with anti-oxidant activity towards metals and their alloys. Green inhibitors
have been investigated for their corrosion and adsorption properties with good
results. The findings from these research works provide evidence of the
adsorption behavior of green inhibitors which was confirmed by the adsorption
isotherms that were proposed. Adsorption is the first step of any surface reaction
and since corrosion is a surface phenomenon the effectiveness of green corrosion
inhibitors is related to their ability to adsorb on metal surfaces. This review
proposes the potential of plant dna as an emerging and promising novel inhibitor
for mild steel. It begins with a list of plants that have been used in studies to
determine corrosion inhibition properties and moves on to establish the adsorption
behavior of bio macromolecules; protein, polysaccharides (chitosan) and dna. It
reviews studies and investigation of dna interaction and adsorption on inorganic
surfaces before focusing on the use of salmon (fish) sperm dna and calf thymus
gland dna as green corrosion inhibitors for mild steel. It concludes that plant dna
is a promising candidate for green corrosion inhibitor given the similarity between
the plant and animal dna structure and function, and the fact that the use of plant
is more environmentally sustainable than animal-based produc
Modified cassava starches as potential corrosion inhibitors for sustainable development
Adsorption Properties and Inhibition of C38 Steel Corrosion in Hydrochloric Solution by Some Indole Derivates: Temperature Effect, Activation Energies, and Thermodynamics of Adsorption
International audienc
Alkaloids extract from Palicourea guianensis plant as corrosion inhibitor for C38 steel in 1 M hydrochloric acid medium
International audienceCorrosion inhibition effect of alkaloids extract from Palicourea guianensis plant (AEPG) on C38 steel in 1 M HCl medium has been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The polarization studies showed that AEPG acts as mixed-type inhibitor. The electrochemical impedance spectroscopy showed that the charge transfer resistance increases and the double layer capacitance decreases on increasing plant extract concentration. The inhibition efficiency of the extract obtained from impedance and polarization measurements was in a good agreement and was found to increase with increasing concentration of the extract. Inhibition efficiency of 89% was achieved with 100 mg L-1 of AEPG at 25 °C. The obtained results showed that, the Palicourea guianensis extract could serve as an effective inhibitor for the corrosion of steel in acid media. The adsorption of AEPG obeys the Langmuir adsorption isotherm
Inhibition effect of alkaloids extract from Annona Squamosa plant on the corrosion of C38 steel in normal hydrochloric acid medium
International audienceIn this work, an alkaloids extract from Annona squamosa plant have been studied as possible corrosion inhibitor for C38 steel in molar hydrochloric acid (1 M HCl). Potentiodynamic polarization and AC impedance methods have been used. The corrosion inhibition efficiency increases on increasing plant extract concentration. Polarisation studies showed that Annona squamosa extract was mixed-type inhibitor in 1 M HCl. The inhibition efficiency of Annona squamosa extract was temperaturedependent and its addition led to an increase of the activation corrosion energy revealing a physical adsorption between the extract and the metal surface. The adsorption of the Annona squamosa extractfollowed Langmuir’s adsorption isotherm. The inhibitive effect of Annona squamosa is ascribed to the presence of organic compounds in the extract. The examined extract is considered as non-cytotoxic substance
Corrosion studies of C38 steel by alkaloids extract of a tropical plant type
International audienceAlkaloids extract of Aspidosperma album was tested as corrosion inhibitor for C38 steel in 1 M HCl by using polarization and electrochemical impedance spectroscopy (EIS). Potentiodynamic polarization curves indicated that the plant extract behaves as mixed-type inhibitors. Impedance measurements showed that the double-layer capacitance decreased and charge-transfer resistance increased with increase in the inhibitors concentration and hence increasing in inhibition efficiency. The effect of temperature on the corrosion behavior of C38 steel in 1 M HCl with and without addition of plant extract was studied in the temperature range 25 – 55 °C. The adsorption of the inhibitor molecules was in accordance with the Langmuir adsorption isotherm. The results obtained show that this plant extract could serve as an effective inhibitor for the corrosion of C38 steel in hydrochloric acid
Corrosion inhibition of C38 steel in 1M hydrochloric acid medium by alkaloids extract from Oxandra asbeckii plant
International audienceThe strict environmental legislations and increasing ecological awareness among scientists have led to the development of “green” alternatives to mitigate corrosion. In the present work, literature on green corrosion inhibitors has been reviewed, and the salient features of our work on green corrosion inhibitors have been highlighted. Among the studied leaves, extract Andrographis paniculata showed better inhibition performance (98%) than the other leaves extract. Strychnos nuxvomica showed better inhibition (98%) than the other seed extracts. Moringa oleifera is reflected as a good corrosion inhibitor of mild steel in 1 M HCl with 98% inhibition efficiency among the studied fruits extract. Bacopa monnieri showed its maximum inhibition performance to be 95% at 600 ppm among the investigated stem extracts. All the reported plant extracts were found to inhibit the corrosion of mild steel in acid media
Inhibitive effect of Siparuna Guianensis extracts on the corrosion of low carbon steel in acidic media
International audienc
Adsorption of a Series of Thiadiazole Derivatives on Low-Carbon Steel from Sulfuric Acid Solutions
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