磁场对Q235钢微生物腐蚀行为的影响

采用腐蚀失重法、电化学测量技术和表面分析技术研究硫酸盐还原菌 (SRB) 在外加磁场下对Q235钢的腐蚀行为。结果表明，磁场条件下SRB对Q235钢的腐蚀作用较无磁场条件下减轻，其阻抗值先减小后增大，而无磁场条件下的阻抗值先增大后减小，说明磁场条件下试样表面的生物膜形成滞后。SEM的分析结果显示，磁场条件下Q235钢表面的生物膜均匀致密，并且紧密地黏附在金属表面。清除腐蚀产物后，无磁场条件下的基体表面呈现较多腐蚀孔和腐蚀裂缝，而有磁场条件下的基体表面则相对平整，说明磁场能有效地抑制SRB对Q235钢的腐蚀。

Effect of Magnetic Field on Microbiologically-influenced Corrosion Behavior of Q235 Steel

The corrosion behavior of Q235 steel in a sulfate-reducing bacteria (SRB) solution in the presence and absence of magnetic field (MF) respectively was investigated by means of mass loss method, electrochemical techniques and surface analysis methods. The results showed that MF could inhibit the corrosion of Q235 steel to certain extent. The measured impedance implied that the MF delayed the formation of SRB biofilms on Q235 steel. SEM observation results indicated that the application of the MF resulted in homogeneous and compact biofilms with high adhesion to the surface of electrode. After removing the corrosion products, the corroded surface of Q235 steel without MF showed many corrosion pits and several corrosion cracks, while that with MF was much more uniform. It implied the application of MF could effectively inhibit the microbiologically influenced corrosion of Q235 steel.