51316-7625-Corrosion Performance of API 5l X65 Steel in a Low Temperature Saline Environment Containing CO2

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Product Number: 51316-7625-SG

ISBN: 7625 2016 CP

Author: Shiladitya Paul

Publication Date: 2016

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This paper focuses on the corrosion performance of API 5L X65 steel in 3.5wt% NaCl solution containing CO2 at 10°C. It is generally acknowledged that iron carbonate scale formation is noticeable above 20°C while tenacious protective scales form above 60°C. This particular study aims to investigate this further and identify the degree of severity of CO2 corrosion of X65 carbon steel at a temperature lower than 20°C. Test coupons were prepared from API 5L X65 carbon steel pipe and immersed in a de-aerated 3.5% NaCl solution at 10°C continuously purged with 1barg CO2. A water bath was used to set and maintain the temperature at 10°C while the test was carried out at ambient pressure. The test coupons were exposed to the CO2 environment for 35 days. During the test free corrosion potential was monitored and polarisation resistance was measured at regular intervals. After exposure the specimens were removed and weighed. Faraday’s law was applied to determine corrosion rate and the results were compared with those obtained from gravimetric technique. Finally metallographic examination and SEM-EDX analysis was carried out on the surface and cross sections of the test specimens.