Tag Archives: Corrosion rate

Impact and Corrosion Behavior of Mild Steel in the Presence of Penicillium Chrysogenum (Published)

The growth of fungi on the surface of metals has great influence on their structural integrity and failure. The possibility of some fungal species to grow on metal surfaces is determined by their secreted metabolites which aid their adaptation to new environmental and nourishment conditions. The aim of this study is to determine the influence of Penicillium chrysogenum on the morphological and corrosion behavior of mild steel using gravimetric and potentiodynamic techniques. Mild steel coupons were contaminated with the above-mentioned fungus in Petri dishes with nutrient medium imitating organic pollution. The gravimetric and electrochemical analysis results revealed that the corrosion rate (CR) and weight loss (∆W) of the mild steel increased with time. The cumulative corrosion rate (ƩCR) increased from 1.74mpy in the absence of P. chrysogenum to 7.58mpy in the presence of the fungus while the corrosion current density (Icorr) increased to 258.6μAcm2 from 187.9 μAcm2.

Keywords: Biocorrosion, Corrosion rate, fungi, metal coupons, structural integrity

Impact and Corrosion Behavior of Mild Steel In The Presence Of Penicillium Chrysogenum (Published)

The growth of fungi on the surface of metals has great influence on their structural integrity and failure. The possibility of some fungal species to grow on metal surfaces is determined by their secreted metabolites which aid their adaptation to new environmental and nourishment conditions. The aim of this study is to determine the influence of Penicillium chrysogenum on the morphological and corrosion behavior of mild steel using gravimetric and potentiodynamic techniques. Mild steel coupons were contaminated with the above-mentioned fungus in Petri dishes with nutrient medium imitating organic pollution. The gravimetric and electrochemical analysis results revealed that the corrosion rate (CR) and weight loss (∆W) of the mild steel increased with time. The cumulative corrosion rate (ƩCR) increased from 1.74mpy in the absence of P.chrysogenum to 7.58mpy in the presence of the fungus while the corrosion current density (Icorr) increased to 258.6μAcm2 from 187.9 μAcm2.

Keywords: Biocorrosion, Corrosion rate, fungi, metal coupons, structural integrity

Corrosion Rate Model for Mild Steel in Hydrochloric Acid (Published)

This paper presents a corrosion rate model for mild steel in hydrochloric acid. A non-linear corrosion rate equation was developed, validated and used to relate the acid point, pH of hydrochloric acid as corrosive medium for mild steel to other variables like corrosion rate and substrate immersion period. The inhibitor used is Sinclair synthetic paint – an organic inhibitor. The effect of variables on corrosion rate has been investigated using non-linear regression analysis. The derived model is an exponential decay function of two input factors. The coefficient of correlation between the calculated and experimental data indicates good performance of the derived model.

Keywords: Corrosion, Corrosion rate, Hydrochloric acid, Mild steel., Model