Single pits were created on microelectrodes of type 304 (UNS S30400) stainless steel (SS), and the early stage of pit growth was evaluated in weak acidic chloride (Cl–) solutions. The effect of anions on pit growth also was evaluated. The current density from the pits was shown to be time dependent. Experimental results agreed well with values predicted by a model of corrosion-rate mediation by means of a diffusion-controlled precipitate dissolution process. Thus, it was concluded that the corrosion rate on the type 304 SS microelectrodes was mediated by mass transport in the weak Cl– solutions.
Subject
Anions,
Pits,
Salts,
Corrosion rate,
Diffusion,
Dissolution,
Solubility,
Solutions,
Current densities,
Corrosion modeling,
Metals,
Pitting,
Electrolytes
Keywords:
anion,
anolyte,
chloride,
corrosion rate,
current density,
diffusion,
mass transfer,
modeling,
pit growth,
salt
NACE International
1994
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