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An experimental investigation of the corrosive influence of SO 2 relative to H 2 SO 4 of marine engine cylinder liners
Author(s) -
Kjemtrup Lars,
Cordtz Rasmus F.,
Jensen Michael V.,
Schramm Jesper
Publication year - 2020
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.1492
Subject(s) - cylinder , lubrication , materials science , combustion , analytical chemistry (journal) , crankcase , two stroke engine , composite material , metallurgy , internal combustion engine , chemistry , automotive engineering , mechanical engineering , chromatography , organic chemistry , engineering
The present study investigates the corrosive influence of SO 2 on cylinder liner wear relative to H 2 SO 4 . Several charge gases with different concentrations of SO 2 , H 2 SO 4 , and H 2 O 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 H 2 SO 4 and H 2 O vapours can condense on the oil wetted liner surface, and the SO 2 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 SO 2, H 2 SO 4 , and H 2 O in the charge gas. In contrast to H 2 SO 4 , the wear of SO 2 is weak (if any), although the SO 2 accumulates/reacts considerably in the lube oil. The highest wear rates are found at elevated H 2 O concentrations.