Author
Gregory O. Avwiri
Other affiliations: Federal University of Petroleum Resource Effurun
Bio: Gregory O. Avwiri is an academic researcher from University of Port Harcourt. The author has contributed to research in topics: Environmental pollution & Environmental science. The author has an hindex of 13, co-authored 54 publications receiving 591 citations. Previous affiliations of Gregory O. Avwiri include Federal University of Petroleum Resource Effurun.
Papers
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TL;DR: In this paper, the action of Vernonia amygdalina (bitter leaf) on the acidic corrosion of 2S and 3RS alloys aluminium was studied using the weight loss method.
99 citations
TL;DR: The soil and sediments from the study area provide no excessive exposures for inhabitants and can be use as construction materials without posing any immediate radiological threat to the public.
74 citations
47 citations
TL;DR: In this paper, the radionuclide concentration levels in soil and water samples in Eagle, Atlas and rock cement companies in Port Harcourt were carried out using the gamma-ray spectrometry.
Abstract: The study of the radionuclide concentration levels in soil and water samples in Eagle, Atlas and rock cement companies in Port Harcourt was carried out. Soil and water samples collected from the respective premises were analyzed using the gamma -ray spectrometry. The average absorbed dose rates of the soil samples were 49.27nGy/h, 45.21nGy/h and 42.33nGy/h for Eagle, Atlas and Rock cements respectively while the water values were 22.16nGy/h, 20.75nGy/h and 19.37nGy/h for the respective companies. Mean dose rate equivalents of 0.18mSv/y and 0.39mS/y were obtained for the water and soil samples. These results are lower than the International Commission on Radiological Protection (ICRP) maximum permitted limit and therefore, have no significance radiological health burden on the environment and the populace. Journal of Applied Sciences and Environmental Management Vol. 9(3) 2005: 27-29
39 citations
32 citations
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TL;DR: In this article, a vivid account of natural products which are used as corrosion inhibitors for various metal and alloys in aggressive media is given, where the authors point out the importance of cheap, safe inhibitors of corrosion.
805 citations
TL;DR: Lang as discussed by the authors reviewed Lang's work in the Journal of Scientific Instruments (JSI) and Supplement No 1, 1951 Pp xvi + 388 + iii + 80 (London: Institute of Physics, 1951).
Abstract: Journal of Scientific Instruments Editor: Dr H R Lang Vol 28 and Supplement No 1, 1951 Pp xvi + 388 + iii + 80 (London: Institute of Physics, 1951) Bound, £3 12s; unbound, £3
725 citations
TL;DR: In this paper, the authors focus mainly on plant materials as green corrosion inhibitors and use computational modeling to understand the mechanism of inhibitor action, their adsorption patterns, the inhibitor-metal surface interface and aid the development of designer inhibitors with an understanding of the time required for the release of self-healing inhibitors.
Abstract: Corrosion control of metals is of technical, economical, environmental, and aesthetical importance. The use of inhibitors is one of the best options of protecting metals and alloys against corrosion. The environmental toxicity of organic corrosion inhibitors has prompted the search for green corrosion inhibitors as they are biodegradable, do not contain heavy metals or other toxic compounds. As in addition to being environmentally friendly and ecologically acceptable, plant products are inexpensive, readily available and renewable. Investigations of corrosion inhibiting abilities of tannins, alkaloids, organic,amino acids, and organic dyes of plant origin are of interest. In recent years, sol-gel coatings doped with inhibitors show real promise. Although substantial research has been devoted to corrosion inhibition by plant extracts, reports on the detailed mechanisms of the adsorption process and identification of the active ingredient are still scarce. Development of computational modeling backed by wet experimental results would help to fill this void and help understand the mechanism of inhibitor action, their adsorption patterns, the inhibitor-metal surface interface and aid the development of designer inhibitors with an understanding of the time required for the release of self-healing inhibitors. The present paper consciously restricts itself mainly to plant materials as green corrosion inhibitors.
500 citations
TL;DR: In this paper, the inhibitory action of leaves, seeds and a combination of leaves and seeds extracts of Phyllanthus amarus on mild steel corrosion in HCl and H 2 SO 4 solutions was studied using weight loss and gasometric techniques.
439 citations
TL;DR: In this paper, the effect of Chamomile (Chamaemelum mixtum L.), Halfabar (Cymbopogon proximus), Black cumin (Nigella sativa L.), and Kidney bean (Phaseolus vulgaris L.) plants on the corrosion of steel in aqueous 1-M sulphuric acid were investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques.
370 citations