Evaluation of purple onion (Allium cepa L.) extract as a natural corrosion inhibitor for carbon steel in acidic media - Galo, Gustavo Tomas; Morandim-Giannetti, Andreia de Araujo; Cotting, Fernando; Aoki, Idalina Vieira; Aquino, Isabella Pacifico (Metals and Materials International, 2020)