Abstract
Due to recent increases in the price of Ni, steel use is currently undergoing a global shift from austenitic stainless steels to ferritic stainless steels. In this study, the corrosion behavior of four types ferritic stainless steels with different Cr contents was investigated to study the effect of Cr content on the corrosion resistance in a sulfuric acid solution. The polarization curves of the ferritic stainless steel with the highest Cr content indicated the best corrosion resistance. No corrosion was observed for the stainless steel with 24 mass% Cr after a potential sweep based on ex-situ SEM images. Corrosion resistivity was improved for high Cr content (>24 mass%) stainless steel because it is considered to form a stable passivation layer.
Highlights
Stainless steels are classified by the three main types: austenitic, ferritic, and martensitic [1, 2, 3, 4, 5]
Investigation of this high-Cr-containing ferritic stainless steel in greater detail revealed the possibility that materials with high corrosion resistance and appreciable electrical conductivity in even harsher environments than usual can be supplied without any surface treatment [28, 29, 30, 31, 32]
The corrosion resistance of all the samples was evaluated based on the Japanese Industrial Standards (JIS) G0579: 2007 measurement method [33]
Summary
Stainless steels are classified by the three main types: austenitic, ferritic, and martensitic [1, 2, 3, 4, 5]. Ferritic stainless steel without surface treatment should be studied from the viewpoint of materials cost for application as bipolar plates which constitute one of the key components in fuel cells. Investigation of this high-Cr-containing ferritic stainless steel in greater detail revealed the possibility that materials with high corrosion resistance and appreciable electrical conductivity in even harsher environments than usual can be supplied without any surface treatment [28, 29, 30, 31, 32]. Corrosion resistance was highly improved at 24 mass% Cr without Ni, while exhibiting a useful level of electrical conductivity (e.g. in fuel cells)
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