Abstract
This study determines the corrosion rate and percent weight loss of mild steel buried in soils of the Niger Delta Area of Nigeria. Six geologic zones representing the upland and wetland soils were used for the assessment. The corrosion rates of mild steel in these soils were monitored to assess the extent of corrosion. However, the upland soils (Odagwa, Ogoni, Ahoada and Omoku) were more resistant to corrosion than the wetland (Kaiama and Elebele) soils. The corrosion rate of mild steel at the 24th month was in the following order of corrosivity: Elebele > Kaiama > Omoku > Ahoada > Ogoni > Odagwa. The percent weight loss was higher at the 24th month, with the highest values found at the Meander Belt Deposits of Elebele. Alternately, the Coastal Plain Sands were found to have the least percent weight loss with the lowest value recorded at Odagwa site at the 24th month. The percent weight loss at the 24th month is in the following order: Elebele > Omoku > Kaiama > Ahoada > Ogoni > Odagwa. The variation in corrosion rate and weight loss of mild steel buried in the different soil types is caused by the aquic moisture regime of the soils, anthropogenic activities carried out, microorganisms present in the soils, and also, the physico-chemical properties of the soils.
Highlights
In the Niger Delta area of the humid tropics, there are automobile workshops which make use of iron
The specific objective of this study is to determine the corrosion rate of mild steel in different soil types, mild steel being used as a predictive tool for monitoring corrosion in soils using weight loss technique
The corrosion rate of mild steel at the 24th month was in the following order of corrosivity: Elebele > Kaiama > Omoku > Ahoada > Ogoni > Odagwa
Summary
In the Niger Delta area of the humid tropics, there are automobile workshops which make use of iron. The process involving gradual chemical or electrochemical reactions between a metal and its environment, leading to the destruction or denaturing of the metal surface (coloradogeologicalsurvey.org/geologic-hazards/corrosive-soils/) is known as corrosion. In the presence of various metals conducting fluid, known as the electrolyte, the electric potential is generated which causes the current to flow when there is a suitable path. Such electrical potential can be developed between two regions of a single component made of metal due to small variations in structure or differences in metal surface exposure conditions (Davies, 2000). The specific objective of this study is to determine the corrosion rate of mild steel in different soil types, mild steel being used as a predictive tool for monitoring corrosion in soils using weight loss technique
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