Pitting and crevice corrosion susceptibility of super austenitic stainless steels in sea water.
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Pitting and crevice corrosion susceptibility of some
super austenitic stainless steels in- sea water were determine element to improve the resistance to pitting
determined by field tests and laboratory examinations · (5 6 7)
and analysis. This paper reports the observed corrosion and crevice corrosion . Streicher (l 0) has also
susceptibility behaviour of the tubes' alloys. The inner observed that the combined addition of molybdenum,
surfaces of the steel tubes were expo$ed to flowing sea nitrogen and silicon provided effective corrosion
water a specially designed tests rig. The steam c:b.amber resistance behaviour to type 3 I 6 stainless steels.
part of the rig which was subjected to elevated
temperature was the region where the middle portion of
·the tubes were located. After splitting in the
laboratory, the tubes from the field test were examined
with optical macro-/microscope (Wild M3C Model) and
the scanning electron microscopy (S. E. M.). Analysis
of the corrosion deposit was performed with the S. E.
M. equipped with Energy Dispersive X -ray (EDAX)
spectrometer, and the X -ray Diffraction spectroscopy
(XRD)_. Thoz1e.h all !!:~~!Joys, except the 3161., were
found to be generally corrosion resistant substantial ·
.... .. . . . - ' ' crevice corrosion occurred ·under the strongly adherent
calcareous layers deposited in the steam chamber
portion of the tubes as observed in one of the runs
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TJ Mechanical engineering and machinery