Corrosion Resistance of Super Austenitic Stainless Steel in Sea Water
No Thumbnail Available
Date
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Description
Field tests and laboratory examinations
and analysis have been performed on series of
super austenitic stainless steel tubes, of which
the inner surfaces were exposed to flowing sea
- water in a specially designed test rig. The region
1around the middle portion of the tubes in the test
rig was subjected to elevated temperature in the
steam chamber part of the rig . The tubes from
the field .test were examined after splitting in the
laboratory with the wild M3C Model optical
macro-/microscope and the S.E .M. (Scanning
Electron Microscopy) . The corrosion deposit and
the biofilm were analyzed with the S.E.M.
equipped with energy Dispersive x-ray (EDAX)
spectrometer, and x-ray Diffraction (XRDJ
spectroscopy. This paper reports the observed
corrosion~ resistance behavior of the tubes' alloys.
· While all the alloys w ere found to be generally
corrosion resistance in sea water, except the
316L, depending upon the test conditions, they
were all also found to be susceptible to crevice
corrosion attack at varying degrees under high
steam temperature. The 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
Keywords
TJ Mechanical engineering and machinery