The effect of cattle manure extract on the corrosion of SS304 in different aqueous corrosives

Abstract

The quest for smart management in combination with sustainable development has brought numerous value-added products from different agricultural solid wastes, including cattle manure. The abundance of cattle manure as a renewable solid waste, along with its phytochemical-rich characteristics, has led to a significant interest in cattle manure utilization as different commercial potent products in various industries. One such approach explores the application of cattle manure as a green corrosion inhibitor. The present work investigates the effect of cattle manure extract (CME) on the corrosion protection ability against pitting corrosion on stainless steel SS304 in aggressive chloride and strong H₂SO₄ solutions. The SS304 alloy is characterized using Electron Backscatter Diffraction (EBSD) and X-ray Diffraction (XRD), while CME is analyzed via Fourier-Transform Infrared Spectroscopy (FTIR) and UV–Vis spectroscopy to identify active constituents. A comprehensive set of electrochemical tests is performed to emphasize the efficacy of CME and its effectiveness as a corrosion inhibitor. The results reveal inhibition efficiencies of 83 % in NaCl and 65 % in H₂SO₄, attributable to CME's ability to modify the metal-electrolyte interfacial activities and develop a protective surface film. Scanning Electron Microscopy (SEM) imaging and Energy Dispersive Spectroscopy (EDS) responses confirmed changes in surface morphologies consistent with inhibitor involvement and film development in both electrolytes. In conclusion, CME significantly improves the active-passive behavior in H₂SO₄ and pitting resistance against chloride attacks.