海洋假交替单胞菌Pseudoalteromonas lipolytica分泌黑色素加速316L不锈钢腐蚀机理的研究

郭娜, 毛晓敏, 惠芯蕊, 郭章伟, 刘涛

Corrosion Behavior of 316L Stainless Steel in Media Containing Pyomelanin Secreted by Pseudoalteromonas lipolytica

GUO Na, MAO Xiaomin, HUI Xinrui, GUO Zhangwei, LIU Tao

表2 不锈钢样品在不同溶液内浸泡不同时间后电化学阻抗拟合参数

Table 2 Electrochemical impedance fitting parameters of stainless-steel samples immersed in different solutions for different times

Solution Time / d Rs / Ω·cm2 Y1 / S·sec n ·cm-2 n Rf / Ω·cm2 Y2 / S·sec n ·cm-2 n Rct / Ω·cm2 Abiotic 1 2.9 --- --- --- 4.0×10-5 0.9 3.0×106 3 4.5 --- --- --- 4.0×10-5 0.9 4.8×106 7 6.4 --- --- --- 4.3×10-5 0.9 6.9×106 10 3.4 --- --- --- 7.5×10-5 0.9 3.0×106 14 5.8 --- --- --- 8.9×10-5 0.8 4.8×107 WT 1 4.9 --- --- --- 3.4×10-5 0.8 3.1×105 3 5.3 --- --- --- 2.6×10-5 0.9 2.7×105 7 6.6 --- --- --- 1.6×10-5 0.9 3.2×106 10 9.5 --- --- --- 1.2×10-5 0.9 5.2×106 14 8.5 --- --- --- 4.7×10-5 0.9 3.7×107 ∆hmgA 1 3.6 --- --- --- 3.3×10-4 0.8 1.8×103 3 4.5 --- --- --- 6.4×10-4 0.8 9.8×102 7 3.7 5.2×10-5 0.8 818 4.0×10-4 0.8 1.3×104 10 1.8 3.4×10-5 0.6 872 3.1×10-4 0.9 3.5×104 14 1.9 2.9×10-5 0.7 714.7 4.7×10-4 0.9 2.8×104 Pyomelanin 1 8.2 --- --- --- 5.7×10-5 0.9 5.4×106 3 2.9 --- --- --- 6.4×10-4 0.8 2.7×107 7 9.5 --- --- --- 8.7×10-4 0.6 1.7×107 10 8.5 --- --- --- 4.7×10-4 0.9 1.8×107 14 8.2 --- --- --- 6.0×10-5 0.8 3.5×106