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Forums
Engineering
Materials and Chemical Engineering
Supercritical CO2 erosion protection
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[QUOTE="zbikraw, post: 6506443, member: 578596"] Stainless steels and many other corrosion- and chemoerosion-resistant alloys are resistant in relatively mild ambient conditions. It is sufficient for most applications, especially in wet and oxidative conditions. sCO2 is an nonpolar solvent , used mainly for dissolving nonpolar substances and eventually performing physicochemical processes with them. It is perfect in cleaning of various things. In contact with solids it easily removes any organic layers, usually protecting these solids from water contact and water-mediated corrosion. Some sCO2 soluble organic compounds are prone to formation of coordination "complex" compounds with metal ions, removing primary formed metal ions from solution. This shifts equilibria between solid metal and fluid solutions in the direction of dissolving metals. This is dissolution, not a classical corrosion, because of the lack of corroded layer on metal. When you are not interested in ionic equilibria in nonpolar solvents, and need only corrosion- resistant material, try to cover your corrosion-sensitive surface with diamond-like carbon layer, or various glasses, also very thin. Regards, zbikraw [/QUOTE]
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Materials and Chemical Engineering
Supercritical CO2 erosion protection
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