Thermogalvanic corrosion of Alloy 31 in different heavy brine LiBr solutions

Abstract

Thermogalvanic corrosion generated between two electrodes of Alloy 31, a highlyalloyed austenitic stainless steel (UNS N08031), has been investigated imposing different temperature gradients in three deaerated LiBr solutions, under open circuit conditions by using a zero-resistance ammeter (ZRA). Besides EIS spectra were acquired in order to explain the obtained results. On the whole, cold Alloy 31 electrodes were anodic to hot Alloy 31 electrodes, since an increase in temperature favoured the cathodic behaviour of the hot electrode. Thermogalvanic corrosion of Alloy 31 in the LiBr solutions studied was not severe, although it negatively affects the corrosion resistance of the cold anode. The protective properties of the passive film formed on the anode surface were found to improve with thermogalvanic coupling time.

Corrosion Behaviour of a Highly Alloyed Austenitic Alloy UB6 in Contaminated Phosphoric Acid

“…These results indicate that the protection provided by the passive film was predominantly due to the barrier layer. Similar results were obtained by other authors [36,[54][55][56].…”

Corrosion behaviors of low‐temperature plasma nickelized coatings on titanium alloy

“…a). This semi‐circle is associated with either the charge transfer reaction, between the sample surface and the electrolyte, that occurs at the metal/electrolyte interface or with the properties of the passive surface film . In addition, the increase in the arc of the semi‐circle is indicative of an increase in the film stability .…”

Effect of surface mechanical attrition treatment on corrosion resistance of commercial pure titanium

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