Inhibition of microbiologically influenced corrosion of X65 steel using D-Tyrosine enhanced eco-friendly bacteriostat rhamnolipid

Abstract

Biofilm-induced microbiologically influenced corrosion (MIC) poses a significant challenge in various industrial and environment. Although eco-friendly bacteriostats are being developed and applied, sterilization requires larger doses of bacteriostats attributed to the protection of bacteria by biofilm, which is a burden on the environment. Therefore, reducing the role of biofilm and decreasing the dosage of bacteriostats to achieve bacteriostatic corrosion inhibition is an efficient method to inhibit MIC. In this work, D-Tyrosine (D-Tyr) is selected to enhance rhamnolipid (RL) for evaluating their effects on corrosion caused by sulfate reducing bacteria (SRB). The results show that RL can reduce the quantity of SRB and mitigate the MIC. Lower doses of RL can achieve effective corrosion inhibition by D-Tyr enhancement. The CLSM analysis indicates that D-Tyr disperses the biofilm allowing the RL to contact the SRB directly. The bacteriostatic corrosion inhibition effect of RL enhanced by D-Tyr is comparable to that of higher doses of RL alone.