HYGROTHERMAL RESPONSE OF PLANT FIBRE REINFORCED COMPOSITES

ABSTRACT The effect of soaking time and temperature response for coconut and raffia fibre reinforced composite on their mechanical properties have been studied. Tensile and compression test for treated and untreated were performed using a universal testing machine (Monsanto Tensometer). The conditioned samples in each case show better tensile and compressive strength compared to the untreated samples. Raffia fibre reinforced polyester showed a better mechanical and moisture absorption properties at various operating temperature in the study

Flow-assisted corrosion in coal seam gas infrastructure

This thesis contributes to investigation of some critical factors that affect the corrosion behaviour of mild steel in coal seam gas (CSG) produced water (single phase) and explores mitigation approaches using eco-friendly corrosion inhibitors. This work includes the study of the effect of surface roughness, fluid flow, surface roughness, immersion time, water chemistry (bicarbonate ion, chloride ion and dissolved oxygen) on the electrochemical behaviour of mild steel in CSG-produced water and simulated conditions using rotating disc electrode (RDE). Ipomoea batatas leaf extract (IBLE) and the combination of sodium nitrite (NaNO2) and potassium iodide (KI) as corrosion inhibitors were studied

The synergistic effect of iodide and sodium nitrite on the corrosion inhibition of mild steel in bicarbonate–chloride solution

>The effect of potassium iodide (KI) and sodium nitrite (NaNO₂ inhibitor on the corrosion inhibition of mild steel in chloride bicarbonate solution has been studied using electrochemical techniques. Potentiodynamic polarisation data suggest that, when used in combination, KI and NaNO₂ function together to inhibit reactions at both the anode and the cathode, but predominantly anodic. KI/NO₂⁻ concentration ratios varied from 2:1 to 2:5; inhibition efficiency was optimized for a ratio of 1:1. The surface morphology and corrosion products were analysed using scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The latter shows that the addition of I⁻ to NO₂ facilitates the formation of a passivating oxide (γ-Fe₂O₃) as compared to NO₂⁻ alone, decreasing the rate of metal dissolution observed in electrochemical testing. The synergistic effect of KI/NO₂⁻ inhibition was enhanced under the dynamic conditions associated with testing in a rotating disc electrode

Effect of hydrodynamics and surface roughness on the electrochemical behaviour of carbon steel in CSG produced water

The influence of fluid flow, surface roughness and immersion time on the electrochemical behaviour of carbon steel in coal seam gas produced water under static and hydrodynamic conditions has been studied. The disc electrode surface morphology before and after the corrosion test was characterized using scanning electron microscopy (SEM). The corrosion product was examined using X-ray photoelectron spectroscopy (XPS) and X-ray diffractometry (XRD).The results show that the anodic current density increased with increasing surface roughness and consequently a decrease in corrosion surface resistance. Under dynamic flow conditions, the corrosion rate increased with increasing rotating speed due to the high mass transfer coefficient and formation of non-protective akaganeite β- FeO(OH) and goethite α- FeO(OH) corrosion scale at the electrode surface.The corrosion rate was lowest at 0 rpm.The corrosion rate decreased in both static and dynamic conditions with increasing immersion time. The decrease in corrosion rate is attributed to the deposition of corrosion products on the electrode surface. SEM results revealed that the rougher surface exhibited a great tendency toward pitting corrosion

Hygrothermal response of plant fibre reinforced composites

The effect of soaking time and temperature response for coconut and raffia fibre reinforced composite on their mechanical properties have been studied. Tensile and compression test for treated and untreated were performed using a universal testing machine (Monsanto Tensometer). The conditioned samples in each case show better tensile and compressive strength compared to the untreated samples. Raffia fibre reinforced polyester showed a better mechanical and moisture absorption properties at various operating temperature in the study © 2006-2014 Asian Research Publishing Network (ARPN)