CO2 Top-of-Line Corrosion(TLC) is one of the most serious problems in wet gas subsea pipelines. Due to better localized corrosion resistance than carbon steel, the new generation of low Cr (2%~4%) alloy steels show superior resistance to CO2 corrosion. Experiments were carried out in a high temperature high pressure condensation autoclave simulating CO2 TLC environment. The composition and morphology of the corrosion scale are characterized by energy dispersive X-ray spectroscopy and scanning electron microscopy analyses. The results indicated that the 2% Cr and 3% Cr alloy steels exhibited slight localized corrosion, and the 4% Cr alloy steel exhibited uniform corrosion. With higher Cr content, the localized corrosion resistance of 4%Cr alloy steel was superior to 2%Cr and 3%Cr alloy steel.

Subject
Scale morphologies, Energy dispersive X-ray spectroscopy, Steel surfaces, Water, Substrates, Top of the line corrosion, Corrosion scales, Surface layers, Wet gas, Steel, Corrosion resistance, Localized corrosion, Alloy steel
Keywords:
Top-of-Line Corrosion, CO2 corrosion, Cr bearing low alloy steel, Cr content, corrosion scale
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2014
Association for Materials Protection and Performance (AMPP)
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