Influence of the specific magnetic susceptibility of AISI 304 steel on its pitting resistance in model circulating waters

Keywords

pitting resistance, austenite, specific magnetic susceptibility, structural heterogeneity of steel, selective dissolution of metals from pitting, chloride-containing media.

Cite as

Snizhnoi G. V., Narivs’kyi O. E., Snizhnoi V. L., Pulina T. V., and Sheiko S. P. Influence of the specific magnetic susceptibility of AISI 304 steel on its pitting resistance in model circulating waters. Physicochemical Mechanics of Materials. 2024. 60(3), 092-098.

https://doi.org/10.15407/pcmm2024.03.092

Abstract

The influence of the parameters of the chloride-containing media and the specific magne­tic susceptibility of AISI 304 steel on its pitting resistance in model circulating waters with pH 4 and chloride concentration of 300 and 600 mg/l is investigated. Chlorides are often found under scale or precipitate from circulating water on the heat transfer elements of heat exchangers made of this steel. It was established that the critical temperature of pitting (CTP) of AISI 304 steel slightly (5–6°С) decreases with an increase in its specific mathe media pH on the СTP of AISI 304 steel is greater than of the parameter c₀. Also, it was established that СTP increases intensively by (10–13°С) when the pH of model circu­lating waters increases from 4 to 7, and with pH 8 it is the same and even lower than with pH 4. It is found that corrosion losses of chromium, nickel and iron from pittings in model circulating waters with pH 4 and chloride concentration of 300 and 600 mg/l significantly depend on c₀ of steel, which is caused by the repassivation of metastable pittings on its surface and the redistribution of current density in stable ones.

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