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As part of a project to develop a database of seawater corrosion resistance including resistance to microbiologically-influenced corrosion (MIC) seawater, MIC exposure tests of five stainless steel alloys were undertaken for three and six month durations.
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Study to assess pitting corrosion resistance of 316L ASS (UNS S31603) and 25%Cr SDSS (UNS S32750) in salt solutions containing dissolved oxygen(DO). The DO levels examined were: 20, 50, and 100ppb, and the concentration of chloride ions were up to 152g/L Cl-, at 50 and 60°C. The results are reported herein.
To better understand the mechanism of erosion-corrosion, electrochemical tests were performed on UNS G10180, UNS S31603 and UNS S32205, used in the construction of pulp/paper machinery components exposed to caustic environments.
In Upstream, CRAs (Corrosion Resistant Alloys) are widely selected to handle seawater and brines in piping, valves, pumps, heat exchangers, vessels, and seawater injection1-4. Also, disposal of produced water is commonly performed through injection into spent fields. Water from a variety of sources including produced water, seawater and surface/fresh water may also be injected to create pressure drive for existing fields. Usually dissolved oxygen (DO) is not fully controlled when there are multiple sources of injection water and sometimes even possibility of injection of fully oxygenated water exists. For oxygenated seawater, the PREN (Pitting Resistance Equivalent Number = %Cr + 3.3 *(%Mo + 0.5 %W) + 16 %N) shall be >40 and limits are applied to the temperature4. Other applications involve Solid CRA or cladded production pipelines which may get flooded with seawater during installation and precommissioning.