Mechano-chemical effect of pipeline steel in microbiological corrosion

The effects of sulfate-reducing bacterial (SRB) on mechano-chemical effect were usually neglected in many literatures. In the paper, the effects of strain, strain rate and SRB physiological activity on mechano-chemical effect of X80 steel were investigated via dynamic tensile testing. The results indicated that SRB physiological activity, the increasing strain and strain rate enhanced individually the mechano-chemical effect. SRB physiological activity and stress synergistically promoted the mechano-chemical effect, while no interaction was observed between SRB physiological activity and strain rate. The local corrosion and sulfide were two main reasons for the increasing mechano-chemical effect in the SRB-inoculated soil solution.