Oxide film thickening on some molybdenum-containing stainless steels used in desalination plants

The variation with time of the open circuit potential of three Mo-containing stainless steels (2.37–4.85% Mo) in the Arabian Gulf water was measured and compared with that of 304 steel under the same conditions. The steady state potentials were approached from negative values, indicating film thicke...

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Bibliographic Details
Published in:Desalination 1988, Vol.69 (3), p.251-260
Main Authors: Shams El Din, A.M., Paul, N.J.
Format: Article
Language:English
Subjects:
film thickening
Marine
Mo-containing stainless steels
oxide stability in seawater
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Summary:The variation with time of the open circuit potential of three Mo-containing stainless steels (2.37–4.85% Mo) in the Arabian Gulf water was measured and compared with that of 304 steel under the same conditions. The steady state potentials were approached from negative values, indicating film thickening. Plots of the steel potentials as function of the logarithm of immersion times showed linear segments. The analysis of the curves allowed the calculation of the rates of oxide thickening. Similar measurements in Gulf waters diluted 10 or 100 times indicated considerable attack on the film, whose extent differed from one alloy to the other. Under the same conditions the three Mo-containing steels developed oxides whose thickness was independent of alloy composition. Conclusions regarding the stability of the oxides and the behaviour of the alloys are drawn.
ISSN:0011-9164
1873-4464
DOI:10.1016/0011-9164(88)80028-6