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The present study investigates the corrosive influence of SO2 on cylinder liner wear relative to H2SO4. Several charge gases with different concentrations of SO2, H2SO4, and H2O in air are fed to a motored light duty test engine that operates at 98 revolutions per minute (rpm) in order to resemble the corrosive combustion gas and cycle speed of large low‐speed two‐stroke marine engines. When the trapped cylinder gas is compressed, the H2SO4 and H2O vapours can condense on the oil wetted liner surface, and the SO2 can be absorbed in the oil film. Hereby the liner surface may be exposed to a corrosive attack. A blend of a base oil and a commercial marine engine cylinder lubrication oil is used in the experiments. During testing, oil samples are extracted from the engine and subsequently analysed for iron and sulphur accumulation (using an energy dispersive X‐ray fluorescence spectrometer) in order to couple cylinder liner wear with the amount of SO2, H2SO4, and H2O in the charge gas. In contrast to H2SO4, the wear of SO2 is weak (if any), although the SO2 accumulates/reacts considerably in the lube oil. The highest wear rates are found at elevated H2O concentrations.

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No abstract