Materials Sciences and Applications, 2018, 9, 126-141 http://www.scirp.org/journal/msa ISSN Online: 2153-1188 ISSN Print: 2153-117X DOI: 10.4236/msa.2018.91009 Jan. 18, 2018 126 Materials Sciences and Applications Corrosion Pattern of Pipeline Steel in Petroleum Pipeline Water in the Presence of Biomas Derived Extracts of Brassica oleracea and Citrus paradise Mesocarp Nnaemeka Chinedu Ngobiri, Kaine Okorosaye-Orubite * Department of Pure and Industrial Chemistry, University of Port Harcourt, Rivers State, Nigeria Abstract Corrosion inhibition characteristics of two biomass derived extracts from outer leaves of Brassica oleracea (BO) and Citrus paradise mesocarps (CPM) on pipeline steel were investigated using modified gravimetric method at am- bient temperature (28 ± ˚C). Petroleum pipeline water was used to simulate a pseudo-anaerobic corrosion cell. The result obtained showed that corrosion was a continuous process in the closed system, while BO and CPM showed near equivalence corrosion inhibition efficiency of 91.45% and 89.44% respec- tively at the concentrations studied. The thermodynamic data suggests inhibi- tion to be through molecular adsorption on metal surface. Keywords Adsorption, Corrosion, Modified Gravimetric, Pipeline Water, Pseudo-Anaerobic 1. Introduction The problem of metallic corrosion is an age long issue and mankind has not ceased to find lasting solution. Though a natural process, the driving force has been attributed to the energy imputed into metallic material during refining of their ores. This thermodynamically inevitable process results to the indirect cost of corrosion damages [1]. Many corrosion mitigation methods abound, one of such is the application of corrosion inhibitors in metallic environments [2] [3]. Steel pipelines are used to transport domestic and industrial fluids because of convenience. However, as metals, they are prone to worsening internal corrosion How to cite this paper: Ngobiri, N.C. and Okorosaye-Orubite, K. (2018) Corrosion Pa- ttern of Pipeline Steel in Petroleum Pipeline Water in the Presence of Biomas Derived Extracts of Brassica oleracea and Citrus para- dise Mesocarp. Materials Sciences and Appli- cations, 9, 126-141. https://doi.org/10.4236/msa.2018.91009 Received: October 20, 2017 Accepted: January 15, 2018 Published: January 18, 2018 Copyright © 2018 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY 4.0). http://creativecommons.org/licenses/by/4.0/ Open Access