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.
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