Promoting the viability of soybean biodiesel by mitigating its oxidative effects on austenitic stainless steel using a natural additive of spent coffee grounds.

ABSTRACT: This work demonstrates the recycling potential of a hydroalcoholic extract of spent coffee waste (HECG) as an environmentally friendly additive to soybean cooking oil (SWCO) biodiesel, alleviating its corrosive impacts on a Cr-rich stainless-steel alloy. The extract is efficiently produced using the Soxhlet extraction method, and its chemical profile is analyzed using GC-MS and FTIR. Furthermore, the anticorrosive properties of HECG are thoroughly evaluated using gravimetry, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). The HECG additive shows excellent inhibitory efficacy (94%) on 307 L stainless steel. The polarization results underline the mixed inhibitory character of HECG. The metal surface is primarily protected against biodiesel-induced corrosion th

SUBMITTER: El Hawary M 

PROVIDER: S-EPMC12429937 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature