AN INVESTIGATION OF CORROSION AND ITS EFFECTS ON MILD STEEL BIODIGESTER MATERIALS BY ELECTROCHEMICAL CORROSION METHOD

C.J. Olelewe, E. C. Okoroigwe, D. O. N. Obikwelu

Abstract


An investigation of corrosion and its effects on mild steel biodigester materials was carried out using electrochemical corrosion method. Animal wastes (cattle and pig) and mild steel (AISI 1020) were used as the study materials. The corrosion experiments on cattle and pig slurries were conducted in 14, 28, 42, 56, 70, 84 and 98 days respectively. The corrosion potentials (Ecorr) measured in cattle slurry after 98 days was -734 mVSCE with a corrosion current density (Icorr.) of 194.52 µA/cm2. After 98 days of experimentation, the results show a stronger tendency for general and pitting corrosion compared to pig waste slurry (-628 mVSCE with Icorr. of 148.023 µA/cm2). At the end of the experiment, Icorr. of samples in cattle slurry increases in the order of C7 ˂ C5 ˂ C6 ˂ C1 ˂ C3 ˂ C4 ˂ C2 whereas Ecorr. increases in the order of C6 ˂ C7 ˂ C5 ˂ C1 ˂ C3 ˂ C2 ˂ C4. Similarly, the Ecorr of samples in pig slurry increases in the order of P6 ˂ P5 ˂ P7 ˂ P1 ˂ P3 ˂ P2 ˂ P4 whereas Icorr. increases in the order of P3 ˂ P7 ˂ P6 ˂ P5 ˂ P1 ˂ P2 ˂ P4. The findings demonstrated that the corroded samples exhibited pitting and generalized corrosion characteristics together with widely distributed cracks. The cattle waste with 5.70% protein was found to be the most aggressive medium of the media and the pig waste, which contained 6.13% protein was the less corrosive medium.

Keywords: Corrosion resistance, corrosion rate, animal waste, anaerobic digestion, mild steel, biodigester.            


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References


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