Investigation on Corrosion Inhibition of Hura Crepitans for 2101 Duplex Stainless Steel in an Acidic Environment

Abstract

The inhibition effect of Hura Crepitans seed extract (HCS) on the corrosion of Duplex Stainless Steel 2101 (DSS2101) in 0.5M H2 SO4 solution has been studied for the first time by weight loss test method and potentio-dynamic polarization method. The extracts elemental compositions were characterized using atomic absorption spectroscopy (AAS). The phenolic and aromatic functional groups in the extracts were revealed with Gas Chro-matography Mass Spectroscopy (GC-MS). From the result, phytochemicals such as saponin, tannins, steroid and flavonoids were observed. The presence of the organic group accounted for the inhibitive efficiency recorded in the environment. Potentiodynamic polarization test was also conducted to confirm the effectiveness of inhibition. The polarization studies revealed that generally the inhibitor produced from seed extract of Hura crepitans, improved the corrosion resistance of DSS2101 in 0.5M H2 SO4. The optimum corrosion inhibitor efficiency was observed at 0.2% inhibitors in 0.5M H2 SO4 for 2101DSS. Polarization curves reveal that HCS extract acts as a mixed-type inhibitor in 0.5M H2 SO4.