It is known that carbon steels display pitting corrosion and slip-dissolution type stress corrosion cracking (SCC) susceptibility in Fuel Grade Ethanol (FGE). Concerns about pitting and SCC of carbon steel in FGE are major issues for pipelines used in FGE transportation. Although earlier studies have revealed the environment factors for pitting corrosion and SCC in FGE, there is little understanding of the powerful influence of steel factors on pitting and SCC in FGE. In the current work, the susceptibility to pitting and SCC of two types of X52 grade carbon steel were investigated by immersion testing and Slow Strain Rate Testing (SSRT). One is the conventional steel, and the other is a low alloy-designed steel which improves resistance to anodic dissolution in FGE environments. The alloy-designed steel showed low susceptibility to pitting and SCC compared with the conventional steel. This result was supported by additional electrochemical measurements and a scratch test. It is considered that alloy element oxides which form at anodic dissolution sites suppress further anodic dissolution at those sites.

Subject
Steel surfaces, Simulated fuel grade ethanol, Oxide films, Anodic dissolution, Steel, Acetic acid, Pitting, Carbon steel, Immersion, Corrosion resistance, Localized corrosion, Elements, Stress corrosion cracking
Keywords:
stress corrosion cracking, localized corrosion, fuel grade ethanol, carbon steel, pipeline
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2016
Association for Materials Protection and Performance (AMPP)
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