The effect of deposition conditions on atmospheric pitting corrosion location under Evans droplets on 304L stainless steel

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Abstract

Pit location during atmospheric corrosion of 304L stainless steel under MgCl2 droplets depends on initial droplet concentration. Pits formed predominantly in the center of the droplet for concentrations ≥ 4 M, closer to the perimeter for 1.5-3 M, and were randomly distributed for concentrations ≤ 1 M. Pits initiated only after the droplets had evaporated to a critical concentration > 3 M, where droplets deposited with lower initial concentrations were thinner. The results can be explained in terms of “differential aeration” and IR drop effects, showing that corrosion in “splash zones” may differ from that under aerosol salt deposit layers that deliquesce forming initially saturated solutions.

Details

Original languageEnglish
JournalCorrosion
Early online date30 Nov 2017
Publication statusE-pub ahead of print - 30 Nov 2017

Keywords

  • Stainless Steel, Atmospheric environments, differential aeration cell, localized corrosion , relative humidity, open-circuit potential