Abstract: The effects of a fluoroprotein foam extinguishing agent ( FP ) with different component contents on the corrosion behavior of Q235 galvanized steel were studied by immersion weight loss, potentiodynamic polarization curve, and electrochemical impedance spectroscopy (EIS). The results showed that the hydrolyzed protein, FeSO4, cobalt acetate, urea, and ethylene glycol components in the FP component played a role in promoting the corrosion of Q235 galvanized steel. Local corrosion occurred on the metal surface, and corrosion products existed, while the two surfactants played a role in corrosion inhibition. The metal surface remained smooth and flat, and the degree of corrosion was light. Among them, FeSO4 had the strongest corrosion effect as a stabilizer, and the fluorocarbon surfactant exhibited the most obvious corrosion inhibition effect. The Nyquist diagram of Q235 galvanized steel showed a single capacitive arc, indicating that its corrosion process was mainly controlled by the charge transfer process. Immersion weight loss and electrochemical experiments revealed that the corrosion strength of each component of the FP followed the order: FeSO4>cobalt acetate>hydrolyzed protein>urea>ethylene glycol>SDS>OBS.

Key words: fluoroprotein foam extinguishing agent, Q235 galvanized steel, corrosion research, electrochemical