Studies on Corrosion of Aluminum Alloys by JP-10 Fuel Using ElectrochemicalImpedance Spectroscopy

摘要

A Government Industry Data Exchange Program alert has been issued that statesthat the fuel system icing inhibitor (FSII) in JP-10 fuel is corroding aluminum components in missile fuel systems during long-term storage under an anhydrous nitrogen atmosphere. Previous investigations into fuel-system corrosion have used extreme conditions such as high FSII concentration or temperature to accelerate corrosion. To better understand the effects of fuel additives on corrosion of aluminum alloy components, electrochemical impedance spectroscopy (EIS) was used to determine the corrosion rate as a function of additive type and concentration under conditions similar to those found in actual use. This paper presents the EIS results of corrosion studies conducted on Al 2024, Al 6061, Al A357, and Al 7075. The effects of concentration of the FSII, presence and absence of butylated hydroxytoluene, effect of water concentration, effect of temperature, and effects of coating on corrosion rates of these alloys will be presented and discussed in detail.