高温高压CO2 环境中超级13Cr不锈钢点蚀有限元模拟

高温高压CO₂ 环境中超级13Cr不锈钢点蚀有限元模拟

凌东, 何坤, 余靓, 董立谨, 张华礼, 李玉飞, 王勤英, 张智

Finite Element Simulation of Pitting Corrosion of Super 13Cr Stainless Steel in High-temperature and High-pressured CO₂ Containing Artificial Formation Waters

LING Dong, HE Kun, YU Liang, DONG Lijin, ZHANG Huali, LI Yufei, WANG Qinying, ZHANG Zhi

表2 点蚀坑初始电位及电流密度

Table 2 Initial potential and current density of pit

Reaction mechanism	Current density equation	Initial potential V	Initial urrent density^[19] A·m^-2
$F e \to F e^{2 +} + 2 e^{-}$	$I_{F e} = I_{F e_{0}} \times e^{0.735 \times \frac{E_{P O L} - E_{F e} - E^{'}}{R T}} \times (\frac{C_{H^{+}}}{C_{H^{+} r e f}})$ $\times e^{\frac{∆ H}{R} (\frac{1}{T_{r e f}} - \frac{1}{T})}$	-0.684	2.7 × 10^-11
$C r \to C r^{3 +} + 3 e^{-}$	$I_{C r} = I_{C r_{0}} \times e^{0.735 \times \frac{E_{P O L} - E_{C r} - E^{'}}{R T}} \times (\frac{C_{H^{+}}}{C_{H^{+} r e f}})$ $\times e^{\frac{∆ H}{R} (\frac{1}{T_{r e f}} - \frac{1}{T})}$	-0.988	1.7 × 10^-9
$H^{+} + e^{-} \to \frac{1}{2} H_{2}$	$I_{c o r r} = I_{H_0} \times e^{(E_{P O L} - E_{H} - E^{'}) / R T} \times (\frac{C_{H^{+}}}{C_{H^{+} r e f}})$	-0.224	2.0 × 10^-4
$H_{2} O + e^{-} \to \frac{1}{2} H_{2} + O H^{-}$	$I_{c o r r} = I_{H_{2} O_0} \times e^{(E_{P O L} - E_{H_{2} O} - E^{'}) / R T}$	-1.072	8.0 × 10^-10