Corrosion of carbon steel by aqueous piperazine protected by FeCO3. (June 2019)

• Record Type: Journal Article
• Authors: Liu, Ching-Ting; Fischer, Kent B.; Rochelle, Gary T.
• Is Part Of: International journal of greenhouse gas control. Volume 85(2019)
• Page Start: 23
• Page End: 29
• Publication Date: 2019-06
• Subjects: Protective FeCO3 film -- Carbon steel corrosion -- Piperazine -- Degradation; Greenhouse gases -- Environmental aspects -- Periodicals; Air -- Purification -- Technological innovations -- Periodicals; Gaz à effet de serre -- Périodiques; Gaz à effet de serre -- Réduction -- Périodiques; Air -- Purification -- Technological innovations; Greenhouse gases -- Environmental aspects; Periodicals; 363.73874605
• DOI: 10.1016/j.ijggc.2019.03.027
• Languages: English
• ISSNs: 1750-5836

Abstract

Highlights: Carbon steel corrosion measured as function of piperazine degradation. Carbon steel protected by FeCO3 at stripper conditions. FeCO3 protection fails at [ethylenediamine]/[piperazine] > 2.2 e-3. Abstract: The effect of piperazine (PZ) degradation on carbon steel corrosion was studied at extremely reducing stripper conditions. The corrosion rate was measured with electrical resistance (ER) corrosion probes, and coupons were used to collect corrosion products for characterization. The measured corrosion rate increased from below 80 μm/yr to around 2000 μm/yr at a critical concentration of degradation products. Measurements with clean PZ and different levels of ethylenediamine (EDA) produced the same effect and suggest that EDA may be one of the corrosive agents in degraded PZ. The corrosion product on the coupon surface was identified as FeCO3 at both low and high corrosion rate, although the appearance of this film was more open with high corrosion rate. These films might dissolve back into solution or be damaged by fluid flow, resulting in incomplete or porous films, and reduced effectiveness in protecting carbon steel from corrosion.