Influence of Cu²⁺ on Sulfate-reducing Bacteria Associated with Magnesium Alloy

抄録

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.