Abstract: To address the typical issue of copper strip corrosion in jet fuel encountered during the production processes of refining enterprises, this study conducts experimental investigations into jet fuel copper strip corrosion. The aim is to elucidate the influence mechanisms of free water, dissolved water, different types of corrosive compounds, and their aqueous solutions on copper strip corrosion in jet fuel. Experimental results indicate that: the direct addition of solid corrosive compounds does not induce copper strip corrosion; significant copper strip corrosion occurs only when aqueous solutions of corrosive compounds form discrete "free water" micro-droplets within the oil phase; whereas water existing in the form of "dissolved water" in jet fuel does not trigger corrosion. Further research reveals that the type and concentration of corrosive compounds also affect the severity of corrosion. At the same concentration, aqueous solutions of sodium chloride (NaCl) and ammonium chloride (NH4Cl) exhibit the strongest corrosivity; for the same corrosive compound, the degree of corrosion intensifies with increasing content. These findings reveal the dominant role of free water in jet fuel copper strip corrosion, offering certain guiding significance for quality stability and safety during production, storage, and transportation.

Key words: copper strip corrosion, free water, water content, corrosive compounds