机构地区: 洛阳理工学院机电工程系
出 处: 《材料工程》 2011年第9期56-61,67,共7页
摘 要: 采用浸泡法、扫描电镜(SEM)和X射线能谱仪(EDS)研究了硫酸盐还原菌(SRB)在两种培养基中,对AZ91镁合金腐蚀行为的影响及其腐蚀机理。结果表明:在培养温度为(30±1)℃的条件下,SRB可以在AZ91表面附着、生长并形成生物膜,生物膜的存在抑制了AZ91的腐蚀。AZ91在含硫酸亚铁铵和维生素C的培养基中所形成的生物膜,其结构疏松,对基体的保护作用较弱。同时硫酸亚铁铵中的Fe2+明显促进了SRB的新陈代谢,但是会在镁合金表面形成FeS沉淀,显著加速AZ91的腐蚀。 Soaking method,SEM and EDS analyses were applied to evaluate the influence and mechanism of sulfate-reducing bacteria(SRB) for the corrosion of AZ91 magnesium alloy in two kinds of culture media.The results show that,SRB can adhere and grow on the surface of AZ91,and then form a biofilm.The biofilm inhibits the corrosion of AZ91 at(30±1)℃.The biofilm formed in the culture medium with(NH4)2Fe(SO4)·6H2O and C6H8O6 is loose,and plays a weak protective role for the matrix.Furthermore,Fe2+ ions in(NH4)2Fe(SO4)·6H2O improve the metabolism of SRB significantly,however,they can form the deposition of FeS,which accelerates the corrosion of AZ91.