人工海水冲刷时间对B10管电化学性能影响的研究

Effects of erosion time on the electrochemical performance of B10 pipe in artificial seawater

利用自行设计的循环冲刷试验机,以人工配置海水为介质,对B10铜镍合金管材Φ57×2.5mm进行冲刷腐蚀试验.结果表明,随冲刷时间延长,开路电位正移,在冲刷192h时达到0.08V;腐蚀电流密度降低,腐蚀电位升高,在192h时分别为9.060×10^(-6) A·cm^(-2)和0.039V;阻抗谱高频区和低频区的容抗弧半径增大,电荷转移电阻和膜层电阻分别达到1764Ω·cm^2和232.1Ω·cm^2.说明在海水的冲刷过程中,B10铜镍合金管的耐蚀性增强.

Using self-designed circulation scouring machine, with water as a medium, manual configuration of B10 copper nickel alloy tube Ф957 ×2.5 mm erosion experiment was carried out. The results show that with the increase of scouring time, open circuit potential is moved upward, in flushing 192 h is 0.08 V. Reduce the corrosion current density and corrosion potential rise, at the time of 192 h were 9. 060 ×10^-6A·cm^-2 and 0. 039 V. Impedance spectrum of high frequency area and frequency area capacitive reactance arc radius increases, the charge transfer resistance and membrane layer resistance, 1764Ω·cm^2 and 232.1 Ω·cm^2, respectively. That is to say, in the process of seawater erosion, B10 copper corrosion resistance of nickel alloy tube does not drop.