Answers are grounded in this paper and cite their sources.
Molybdenum (Mo) is known for its roles in microbial enzymes and in enhancing the corrosion resistance of engineering alloys. In this study, Mo coupons were exposed to a sulfate-reducing bacterial (SRB) culture Desulfovibrio desulfuricans and then changes in surface chemical states were analyzed by XPS and pitting resistance by potentiodynamic polarization in deaerated 0.1 M HCl. Further investigation was conducted using XPS after potentiostatic polarization of the SRB-exposed Mo coupons at −160 mV SCE in deaerated 0.1 M HCl. The samples were analyzed with and without the presence of biofilm. Control samples were prepared in uninoculated medium. X-ray photoelectron spectroscopy analysis revealed two effects: the surface stability of Mo coupon was compromised due to MoS2 formation during exposure to SRB; and molybdate formation induced by bacterial H2 S production was inhibitory to sulfate reduction by forming Mo(V)–S complexes with intermediate sulfur-containing amino groups and proteins. The Mo(V)–S complexes were sparingly soluble and thus protective in the hydrochloric solution.
No takes yet. Share an insight, caveat, or question.
Chen et al. (1999) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: