DEPARTMENT OF MECHANICAL ENGINEERING

Permanent URI for this communityhttps://repository.ui.edu.ng/handle/123456789/476

Browse

Has files: YesSubject: search.filters.subject.corrosion

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Effect of iso-thermal treatment on the corrosion behaviour of low carbon steel (Nigerian C2R grade) in a buffered solution containing chloride and carbonate ions
    (2012) Atanda, P. O.; Olorunniwo, O. E.; Alabi, O. D.; Oluwole, O. O.
    This work has investigated the corrosion behavior of low carbon steel subjected to four different modes of iso-thermal heat treatment and then immersed in a neutral buffer corrosive medium containing carbonate and chloride ions. The low carbon steel material was cut into twenty small pieces of length 18±2mm, put in groups of five and subjected to: Annealing, Hardening, Normalizing and tempering, each corresponding to an iso-thermal mode of treatment. The samples were ground and polished, and micrographs taken for each mode of treatment. The samples were then immersed into the corrosion medium; a neutral buffer and samples were withdrawn for measurement every 72 hours. The experiment lasted 360 hours (15 days). The weight loss due to corrosion of the samples, the corrosion rate of the samples and the pH variation of the samples were monitored against time of exposure. It was observed that samples which had undergone tempering mode of heat treatment turned out to be the ones with the best corrosion resistance.
  • Thumbnail Image
    Item
    Effects of cassava juice on corrosion of mild and high yield steel bars in concrete structures
    (2009-03) Oluwadare, G. O.; Akindahunsi, A. A.; Oluwole, O.; Agbaje, I. A
    Nigeria is the highest producer of cassava in the world and cassava juice is rich in hydrocynic acid, a by-product from the extraction process. This paper examines the effect of cyanide ions, the reacting ions from hydrocyanic acid on reinforcing bars when cassava tubers are processed on reinforced concrete palteforms. Mild and high yield steel reinforcing bars are embedded in concrete cubes cast and cure for 21 and 28 days. These steel bars were used to model the experiment. Half-cell potential apparatus was used to take potentials measurement of both steel bars with concrete cubes immersed in hydrocyanic acid and ordinary water for 32 days. Corrosion rates under these different conditions were monitored. The results demostrated that both steel types will corrode in hydrocynaic acid, however, high yiled steel has better corrosion resistance than mild steel: this is due to the mechanical properites and chemical composition of the steel. It was also observed that with increase in curing age the degree of probability of corrosion decreased.