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Title: Comparison on influence of molybdenum on the pitting of stainless steels in chloride and bromide solutions
Authors: Blackwood, D.J. 
Chua, S.E.
Keywords: Bromide
Stainless steels
Issue Date: 2011
Citation: Blackwood, D.J.,Chua, S.E. (2011). Comparison on influence of molybdenum on the pitting of stainless steels in chloride and bromide solutions. 18th International Corrosion Congress 2011 1 : 157-165. ScholarBank@NUS Repository.
Abstract: It is well known that molybdenum additions increase the resistance of stainless steels to pitting corrosion in chloride environments. However, it has been reported in the presence of bromide ions additions of molybdenum are far less effective. There are also reports that Mo provides no improvement in the pitting potential of austenitic stainless steels but does so for ferritic stainless steels. The cause of this phenomenon is a matter of current debate, with the focus being on the oxidation state of Mo in the passive film and as to whether nickel oxides are present in this film. In this paper the results of an investigation into the pitting resistance of three austenitic grades 304L, 316L and UNS S31254 as well as the duplex grade 329 in both chloride and bromide solutions are presented along with an XPS investigation into the nature of their passive films. Potentiodynamic pitting potential measurements indicate that Mo is still making a valuable contribution to the pitting resistance, although the pitting potential is observed to be more strongly a function of temperature in chloride than in bromide environments, which could explain some of the previous contradictory results. XPS indicated that Mo(VI) exists in the passive films of the 316L and S31254, but did no yield any evidence for the presence of nickel oxides. Possible mechanisms to explain the difference pitting behaviours in chloride and bromide environments will be presented in the paper.
Source Title: 18th International Corrosion Congress 2011
ISBN: 9781618393630
Appears in Collections:Staff Publications

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