Abstract
Samples of low alloyed steel AISI 4140 42CrMo4, used for casing, and stainless injection-pipe steel AISI 420 X46Cr13 as well as AISI 420J X20Cr13 were kept at T=60°C and ambient pressure as well as p=100bar for 700h - 8000h in a CO2-saturated synthetic aquifer environment similar to possible geological on-shore CCS-sites in the northern German Basin. Corrosion rates and scale growth are reduced at high pressure and pits -indicating local corrosion- decrease in diameter but increase in number as a function of exposure time.
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