2007 年 47 巻 11 号 p. 1647-1651
Influence of Cu2+ on sulfate-reducing bacteria associated with magnesium alloy was investigated. X-ray diffraction results reveal that the reaction products of magnesium alloy from the SRB and sterile medium containing Cu2+ consist of Mg(OH)2 and Cu phases. Cu2+ can inhibit the growth of SRB, but it can not die out SRB cells in biofilm and medium. Cu2+ is a deleterious ion, which can form Cu–Mg micro-galvanic corrosion electrocircuits on substrate surface leading to the severe corrosion of magnesium alloy. Although extracellular polymeric substances (EPS) of SRB have the ability to bind Cu2+, severe micro-galvanic corrosion was still observed on magnesium alloy surface. This indicates that Cu2+ can not act as a sterilization reagent or a composition of sterilization reagent for SRB associated with magnesium alloy.