Attached picture is a simple representation of solution mining plant, where a metal comes in contact with lean brine (say 5% salt) on inside and saturated brine (say 40% salt) on outside creating a concentration cell. Apart from concentration difference what else can influence this type of system and how it can be addressed? Kindly explain if you have come across any similar systems in Oil & Gas refineries.
Thanks!
Dear Vinitih,
As corrosion most often occurs in aqueous environments.
Galvanic corrosion is the most common form of corrosion. Pitting Corrosion occurs under certain conditions, which leads to accelerated corrosion in certain areas rather than uniform corrosion throughout the piece. SCC, localized and crevice are more prominent corrosion.
Ashish
Dear Dr. Vinith Gandhi Rajendran,
in addition to what Dr. Ashish Thakur said, I would add since you should be dealing with liquid flows (of which I do not know the speed and the possible presence of suspended solids) the form of corrosion-erosion of the materials.
Best regards, Pierluigi Traverso.
Dear pierluigi,
I think Vinith can calculate easily the speed in any type of liquid using general corrosion formula 87.6 . (W/DAT) or by ex-foliation rate. In case of erosion, general corrosion rate is 2-10 mm/y and velocity range is 0.01-0.5m/s he may consider.
Ashish
Dear Vinith Gandhi Rajendran,
As you are using Mild steel pipes, there are mostly chances of general dissolution of the surfaces in presence of aqueous medium. Mild steel is active material. Pitting corrosion, rather pits are formed in case active passive materials. You may also expect some surface cracks (which are mostly inter granular) under SEM analysis in this case. Weight loss measurement dealing with corrosion rate (mpy) evaluation will be also helpful in your case.
Hope it helps.
Regards
Soumyabrata
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