1200 MPa级海洋平台用无碳化物贝氏体中锰钢腐蚀行为

李炎阳, 于驰, 赵伟, 高秀华, 杜林秀

Corrosion Behavior of 1200 MPa Class Carbide-free Bainite Medium Manganese Steel for Offshore Platform

LI Yanyang, YU Chi, ZHAO Wei, GAO Xiuhua, DU Linxiu

表7 不同腐蚀时间(72~576 h)后三种实验钢的EIS曲线拟合结果

Table 7 EIS curve fitting results of three experimental steels with different corrosion time (72~576 h)

Material Rs / Ω·cm2 R1 / Ω·cm2 C1 / μF·cm-2 Q / Ω-1·cm-2s n Rct / Ω·cm2 n Rw / Ω-1·cm-2·s0.5 1# 72 h 4.32 3.64 6.158 × 10-2 1.192 × 10-6 13.76 0.192 0.0211 360 h 9.46 12.05 3.622 × 10-2 2.084 × 10-6 24.58 0.307 0.0203 576 h 13.69 15.77 1.875 × 10-2 1.841 × 10-6 47.79 0.216 0.0287 2# 72 h 10.72 5.61 4.437 × 10-2 1.634 × 10-6 24.17 0.164 0.0227 360 h 16.47 18.26 2.172 × 10-2 4.530 × 10-6 45.32 0.212 0.0176 576 h 18.24 22.93 0.652 × 10-2 3.488 × 10-6 58.31 0.279 0.0341 3# 72 h 8.83 6.45 4.394 × 10-2 2.124 × 10-6 23.96 0.168 0.0270 360 h 15.35 18.79 1.781 × 10-2 2.658 × 10-6 47.51 0.197 0.0255 576 h 22.14 24.37 0.957 × 10-2 1.143 × 10-6 59.65 0.253 0.0326