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It is known that carbon steels in Fuel Grade Ethanol (FGE) has pitting corrosion and active path corrosion-type stress corrosion cracking (SCC) susceptibility. In the current work, susceptibility of pitting and SCC of two types of X52 grade carbon steel were investigated by immersion testing and Slow Strain Rate Testing (SSRT).
It is known that carbon steels in Fuel Grade Ethanol (FGE) has pitting corrosion and active path corrosion-type stress corrosion cracking (SCC) susceptibility. Concerns about pitting and SCC of carbon steel in FGE are major issues about pipeline for FGE-transportations. Although earlier studies have revealed environment factor on 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 susceptibility of 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 low alloy designed steel to improve the resistance for anodic dissolution in FGE environment. Alloy designed steel showed low susceptibility for pitting and SCC compared with conventional steel. This result was supported by additional electrochemical measurements?such as anodic polarization curves measurement and scratch test. It can be considered that alloy element oxides formed at anodic dissolution site suppress further anodic dissolution on site.
Key words: downloadable, stress corrosion cracking, localized corrosion, fuel grade ethanol, carbon steel, pipeline
Stress corrosion cracking (SCC) of carbon steel in fuel ethanol service has been observed in an increasing number of failures in the last few years. In the presence of oxygen, all of the samples evaluated in this study produced varying degrees of SCC, except for one of the producer ethanol samples. The reason for the high corrosion potential in this sample is still unknown and more detailed analysis of the sample chemical make-up is needed.
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