The main cause of corrosion on exhaust valves in
large engines running on fuel oil, and also on certain components of turbo-compressors, is that fuel
oil contains specific metallic impurities, i.e., vanadium and sodium.
During the combustion of fuel oil in the engine, these impurities form
various types of sodium vanadates
that have a low melting point, and are therefore in a liquid state or semi-liquid
state and are corrosive
at the temperature of the gases in contact with the exhaust valves. Maximum
corrosiveness occurs when the ratio of vanadium to sodium is 3, which
corresponds to a vanadate with the lowest melting point (340-350ºC).
This cause of
corrosion, accepted by practically all engine manufacturers, can be
countered and prevented by means of treatment of the fuel oil with the
additive
“rb bertomeu” beco F1/ASF,
which contains, among other components, organic magnesium. During combustion of the fuel
oil, this substance forms magnesium
vanadates, which are of a high melting point, in a solid state and
non-corrosive. Throughout the last eight years, our clients
have been able to verify that results obtained have provided satisfactory
financial benefits.
For further information
on this subject, consult the following documents compiled by rb bertomeu (by
clicking on the chosen title):