Corrosion Engineering
Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480
Research Paper
Corrosion Behavior of Type 430 Stainless Steel in a Non-aqueous Electrolyte for Lithium-ion Batteries Containing LiPF6 Salts
Wataru KimuraMasanobu KumagaiHikaru SutoHitoshi Yashiro
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2025 Volume 74 Issue 3 Pages 46-51

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Abstract

Type 430 stainless steel showed different corrosion behavior from Type 304 in a non-aqueos electrolyte containing LiPF6 in terms of potential dependency. At 4 V (Li/Li), Type 430 was highly susceptible to corrosion while Type 304 was resistant. At 5 V (Li/Li), Type 430 was passivated as well as Type 304. X-ray photoelectron spectroscopy (XPS) analysis revealed that Type 430 was protected by two-layer of passivation film at 5 V (Li/Li). The outer layer consited of Fe-fluoride (FeF3) and smaller amount of oxide of Fe and Cr. It was suggested that FeF3 played an essential role in the passivation of Type 430 at 5 V (Li/Li). The higher corrosion susceptiblity of Type 430 at 4 V (Li/Li) was ascribed to the difficulty of forming of FeF3, and the lower corrosion resistance of the pristine film as compared with Type 304.

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