Institute for Corrosion and Multiphase Technology, Department of Chemical & Biomolecular Engineering, Ohio University, Athens, Ohio 45701, United States.
Environ Sci Technol. 2010 Dec 1;44(23):9233-8. doi: 10.1021/es102578c. Epub 2010 Nov 4.
The corrosion property of carbon steel was evaluated using an autoclave under CO(2)-saturated water phase and water-saturated CO(2) phase with impurities (O(2) and SO(2)) at 80 bar CO(2) and 50 °C to simulate the condition of CO(2) transmission pipeline in the carbon capture and storage (CCS) applications. The results showed that the corrosion rate of carbon steel in CO(2)-saturated water was very high and it increased with adding O(2) in the system due to the inhibition effect of O(2) on the formation of protective FeCO(3). It is noteworthy that corrosion took place in the water-saturated CO(2) phase under supercritical condition when no free water is present. The addition of O(2) increased the corrosion rates of carbon steel in water-saturated CO(2) phase. The addition of 0.8 bar SO(2) (1%) in the gas phase dramatically increased the corrosion rate of carbon steel from 0.38 to 5.6 mm/y. This then increased to more than 7 mm/y with addition of both O(2) and SO(2). SO(2) can promote the formation of iron sulfite hydrate (FeSO(3)·3H(2)O) on the steel surface which is less protective than iron carbonate (FeCO(3)), and it is further oxidized to become FeSO(4) and FeOOH when O(2) is present with SO(2) in the CO(2)-rich phase. The corrosion rates of 13Cr steel were very low compared with carbon steel in CO(2)-saturated water environments with O(2), whereas it was as high as carbon steel in a water-saturated CO(2) phase with O(2) and SO(2).
采用高压釜在 CO(2)饱和水相和水饱和 CO(2)相中，于 80 bar CO(2)和 50°C 条件下，模拟碳捕集与封存 (CCS) 应用中 CO(2)输送管道的情况，评价碳钢的腐蚀性能，该条件下存在杂质 (O(2)和 SO(2))。结果表明，碳钢在 CO(2)饱和水中的腐蚀速率非常高，且随着体系中 O(2)的加入而增加，这是由于 O(2)对保护性 FeCO(3)形成的抑制作用。值得注意的是，在不存在游离水的超临界条件下，水饱和 CO(2)相中会发生腐蚀。O(2)的加入会增加碳钢在水饱和 CO(2)相中的腐蚀速率。气相中添加 0.8 bar SO(2)（1%）会使碳钢的腐蚀速率从 0.38 毫米/年急剧增加到 5.6 毫米/年。当同时添加 O(2)和 SO(2)时，腐蚀速率进一步增加到超过 7 毫米/年。SO(2)可以促进铁亚硫酸盐水合物 (FeSO(3)·3H(2)O) 在钢表面的形成，其保护性比碳酸亚铁 (FeCO(3))差，并且当 CO(2)富相中有 SO(2)和 O(2)时，它会进一步氧化为 FeSO(4)和 FeOOH。与碳钢相比，13Cr 钢在含有 O(2)的 CO(2)饱和水中的腐蚀速率非常低，而在含有 O(2)和 SO(2)的水饱和 CO(2)相中，其腐蚀速率与碳钢相当。
