In situ characterization of naphthenic corrosion of API 5L X70 steel at room temperature

•The naphthenic corrosion occurred at room temperature.•Insoluble iron naphthenate in mineral oil was formed on the steel surface.•The use of in situ optical micrographs during the electrochemical experiments.•The use of in situ FTIR to characterize corrosion product.•The use of in situ AFM to study...

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Bibliographic Details
Published in:Fuel (Guildford) 2016-11, Vol.184, p.648-655
Main Authors: Rios, Emerson C., Oliveira, Aloadir L., Zimer, Alexsandro M., Freitas, Renato G., Matos, Roberto, Pereira, Ernesto C., Mascaro, Lucia H.
Format: Article
Language:English
Subjects:
Crude oil
Electrochemical noise
In situ AFM
In situ FTIR
Naphthenic corrosion
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Summary:•The naphthenic corrosion occurred at room temperature.•Insoluble iron naphthenate in mineral oil was formed on the steel surface.•The use of in situ optical micrographs during the electrochemical experiments.•The use of in situ FTIR to characterize corrosion product.•The use of in situ AFM to study corrosion. Different in situ coupled techniques were used to characterize the naphthenic corrosion of API 5L X70 steel at room temperature. In situ optical microscopy coupled with an electrochemical noise technique indicated a general corrosion process. In situ AFM images showed the early formation of the corrosion product with a thickness of 600nm after 90min of immersion. The main regions observed in the temporal evolution of FTIR spectra are evidence of the formation of an iron naphthenate film even at room temperature.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2016.07.068