Authors
M.D. Kass, J.F. Thomas, D. Wilson, S.A. Lewis, Sr., S.A. Sarles
Publication
SAE
Paper 2005-01-0657, Society of Automotive Engineers, 2005
Abstract
A
high-resolution corrosion probe was placed within the airhorn section of
the exhaust gas recirculation (EGR) loop of a heavy-duty diesel
engine. The corrosion rate of the mild-steel probe elements was
evaluated as a function of fuel sulfur level, EGR fraction, dewpoint
margin, and humidity. No significant corrosion was observed while
running the engine using a No. 2 grade < 15 ppm sulfur diesel fuel;
however, high corrosion rates were observed with No. 2 diesel fuel
(~ 350 ppm sulfur) while condensing water in the EGR loop. The
rate of corrosion on the mild steel elements increased with increasing
levels of sulfate in the condensate. However, the engine conditions
influencing the sulfate level were not clearly identified in this
study.
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