Abstract
The corrosion of mild steel and Al alloy in Fomtec P 6% and 6% P Profoam 806 protein-based foam concentrates was investigated. Weight-loss data for steel showed corrosion penetration of 0.745 mipy in Fomtec and 2.269 mipy in Profoam, whereas for Al alloy the penetration levels were 0.474 and 1.093 mipy, respectively. Scanning electron microscopy and energy dispersive X-ray spectroscopy allowed characterization of the metallic surface covered or free from corrosion products. Values of corrosion potential, corrosion current density and corrosion penetration were calculated by using potentiodynamic polarization curves. Electrochemical impedance spectra illustrated the change in polarization resistance during anodic polarization. Data obtained by accelerated electrochemical methods confirm the greater aggressiveness of the Profoam concentrate compared to Fomtec concentrate.
Highlights
Values of corrosion potential, corrosion current density and corrosion penetration were calculated by using potentiodynamic polarization curves
Being derived from natural products, the used protein-based foam concentrates are very quickly biodegradable compared to alternatives, and they do not require the use of environmentally harmful glycol additives, which are necessary in synthetic-based foams, especially for low-temperature use
As we mentioned above, the investigated protein foam concentrates contain inorganic salts, which can be more aggressive. This contribution describes the experimental program undertaken to test the corrosivity of Fomtec P 6% and 6% P Profoam 806 firefighting foam concentrates in storage steel vessels or flowing into piping and Storz couplings made of Al alloy for fire hoses
Summary
The main purpose of the present research was to study the corrosion of carbon steel and an aluminum alloy, which are commonly used as construction metallic materials in firefighting, in Fomtec P 6% and 6% P Profoam 806 aggressive foam concentrates
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