ABSTRACT Carbon dioxide (CO2) corrosion, also known as sweet corrosion of steels has increased in recent years due to the injection of CO2 into oil wells in order to increase oil recovery and production. Despite the fact that carbon steel has a low corrosion resistance, it is widely used in the petroleum industry due to its economic advantage. It has been reported that when ferrous steels are exposed to a corrosive medium, they form a protective surface film which helps to decrease the rate ...
Abstract Most countries in Africa are faced with difficult challenges in terms of providing safe, clean drinking water for their citizens. The world Health organization estimates that approximately 500 lives are lost per day in Nigeria from water related diseases while globally, 1.1 billion lack access to improve water supplies. Point-Of-use water treatment technologies, such as household ceramic water filters, offer an affordable and effective means of treating water to standards suitable f...
ABSTRACT Organic dye pollutants are sometimes released into the environment with wastewater from industries which make use of such dyes. In surface water, they contaminate the surrounding environment while their residue accumulates on land. These chemicals are noted for their toxicity to living organisms and they can cause cancers in human beings. In this study a relatively simple, long term and cost effective remedy for dye pollution reduction was developed; with a focus on the use of semico...
ABSTRACT The effect of cement particle size of Portland cement on the properties of cement mortar and paste were investigated. This was done at a definite mix and water-cement ratio. Fresh clinkers collected from Dangote Cement Factory was ground together with 3% gypsum using disc grinder. The chemical compositions of the clinker and gypsum were determined using XRF. Five different sieve sizes comprising (212, 180, 90, 63, 45) m were used to characterize the cement sample finen...
ABSTRACT The corrosion rates of magnetized mild steel coupons in HCl solutions were studied using the weight loss method. The coupons were magnetized with a laboratory electromagnet at 0.38T, 0.57T, 0.76T, 0.95T and 1.51T and immersed in HCl solutions of pH ranging from 2 to 6. Experimental results showed that coupons magnetized at 0.76T, 0.57T and 0.38T exhibited higher corrosion rates than their non-magnetized counterparts at pH values less than 5. At pH 5 and above however, they showed...
ABSTRACT The effect of electrode types on the solidification cracking susceptibility of austenitic stainless steel weld metal was studied. The work also investigated the effect of electrode types on the strain hardening exponent of austenitic stainless steel welded joints. Manual metal arc welding method was used to produce the joints with the tungsten inert gas (TIG) welding serving as the control. Tensile tests and metallography of the joints were carried out using standard techniqu...
ABSTRACT The inhibition of corrosion of mild steel by Azadirachta indica leaf extract in acidic environments of HCl and HNO3 from pH1 to pH6 has been investigated using the weight loss technique. The Azadirachta indica leaf extract is the inhibitor and the mild steel used was in the form of coupons. The investigations were carried out at ambient temperature. The optimum concentration of the extract used for the experimentation was obtained by soaking 200g of ground fresh Azadirachta indic...