微生物附着对不锈钢钝化性能的影响

EFFECT OF BIOFILM ON THE ELECTROCHEMICAL PASSIVITY OF STAINLESS STEEL

通过荧光显微镜研究了天然海水及无菌海水中不锈钢表面微生物的附着状态,同时利用扫描电镜和能谱仪对有微生物附着的不锈钢电极及对比试样表面成分进行了分析,根据不同浸泡时间内微生物附着以后极化曲线尤其是阳极钝化曲线的变化,解释了微生物附着对不锈钢钝化性能的影响.

The influence of microbes adhesion on the passive state of high - Mo steel in natural seawater was studied. The conformation of biofilm on metal surface was studied by epifluorescence microscope. And analyzed the composition of surface film with EDS. Results showed that the content of Cr in the passive film of stainless steel increased a little due to the formation of biofilm. Polarization curves revealed that, in the earlier immersion time of high - Mo steel, the longer the time immersed in natural seawater for high - Mo steel, the more positive the over- passivate potential and the less the passive current density. In other words, the formation of biofilms added the passive film stability of high - Mo stainless steels in natural seawater.