Study on the corrosion of metal of fire-fighting equipment by foam extinguishing agent at different temperatures
In order to explore the corrosion behavior of foam extin-guishing agent on the metal of fire-fighting equipment at different temperatures,water film foam extinguishing agent(AFFF),syn-thetic foam extinguishing agent(S)and fluoroprotein foam extin-guishing agent(FP),which are commonly used in fire-fighting,and two kinds of metal materials of fire-fighting equipment(galva-nized steel,aluminum alloy)were selected.The immersion weight loss and electrochemical test experiments were carried out at 40～80 °C,and the corrosion rate was calculated.The key pa-rameters such as corrosion current density were measured.The re-sults show that the corrosion rate of the metal increases with the increase of temperature.The corrosion rates of the three foam ex-tinguishing agents on the two metals are:FP>S>AFFF,and the corrosion resistance of the two metals is:aluminum alloy>gal-vanized steel.With the increase of temperature,the corrosion de-gree of the two metals increased.Corrosion products and pitting pits appeared on the surface of galvanized steel,and the surface color of aluminum alloy became darker.In FP,pitting pits ap-peared on the surface of both metals,and their number and depth increased with the increase of temperature.Based on electrochemi-cal tests,it was found that at the initial stage of corrosion,with the increase of temperature,the corrosion current density in-creased,the capacitance arc diameter and charge transfer resis-tance decreased,and the corrosion accelerated.In addition,at dif-ferent temperatures,the corrosion mechanism of aluminum alloy in three foam solutions and galvanized steel in AFFF and FP is under charge transfer control,but galvanized steel in S shows typical diffusion control.
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