Pitting corrosion of Type 430 stainless steel under chloride solution droplet

To clarify the critical relative humidity (RH) to initiate pitting corrosion and the rusting mechanism in a marine atmospheric environment, pitting corrosion of Type 430 stainless steels under drops of MgCl 2 solutions were investigated. A pitting corrosion test was performed at different relative h...

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Bibliographic Details
Published in:Corrosion science 2010-06, Vol.52 (6), p.2035-2043
Main Authors: Hastuty, Sri, Nishikata, Atsushi, Tsuru, Tooru
Format: Article
Language:English
Subjects:
A. 430 Stainless steel
Applied sciences
B. EPMA
B. SEM
C. Atmospheric corrosion
C. MnS inclusion
C. Pitting corrosion
Chlorides
Corrosion
Corrosion environments
Corrosion mechanisms
Droplets
Exact sciences and technology
Ferritic stainless steels
Marine
Metals. Metallurgy
Pitting (corrosion)
Relative humidity
Stainless steels
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Summary:To clarify the critical relative humidity (RH) to initiate pitting corrosion and the rusting mechanism in a marine atmospheric environment, pitting corrosion of Type 430 stainless steels under drops of MgCl 2 solutions were investigated. A pitting corrosion test was performed at different relative humidities under droplets with various diameters and thicknesses. The probability of pitting decreased as the diameter and thickness decreased. Pitting progressed only when the chloride concentration exceeded 4 M, which is the equilibrium concentration at 80% RH. Accordingly, pitting of Type 430 could be initiated when the RH was less than 80%. Additionally, a pitting corrosion mechanism of Type 430 stainless steel under droplets containing chloride ions is proposed.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2010.02.031