Experimental and Quantum Chemical Study of Quinone Derivatives as Inhibitors of Corrosion and Hydrogen Absorption by Steel

Abstract

Hydroquinone derivatives are studied as inhibitors of microbiological corrosion and hydrogen absorption by mild steel in water salt media that supports development of sulfate reducing bacteria (SRB). The chosen composition of the media is close to sea water containing biogenic H2S. Н2S content, bacterial titer in corrosive media, its pH, Redox potential Eh, and φ of steel together with the quantity of hydrogen absorbed by surface steel sub-layers, were measured. Protective action against corrosion achieved by the best compounds studied, reached the values of 65…84%, while against hydrogen absorption by steel samples − 60…72%. The presence of the studied derivatives of hydroquinone at concentration C= 5 mMoldm–3 resulted in the decrease of SRB cell count at the rate of 48…84%, the suppression rate being at the values of 29…57%.

Modelling Macroscopic Properties of Organic Species on the Basis of Quantum Chemical Analysis (on an Example of Inhibiting Efficiency of Ureides and Acetylides against Corrosion)

“…In Table 7, EDTA designate ethylendiaminetetraacetic acid derivatives, NTA -nithrilotriacetic acid derivatives, and MATA -derivatives of methylaminetetraacetic acid. [5][6][7][8]10], the results brought above in Tables 7 and 8 mean that the inhibitive properties of the selected ureides under chosen conditions are based on electron donating rather than accepting properties of their molecules.…”

“…By means of different quantum chemical methods (PM/3, MP/3, MNDO, ab initio), various properties of individual chemical species (including organic) have been rather successfully explained so far: efficiencies as anti-corrosion inhibitors [1][2][3][4][5][6][7][8][9][10] (also as inhibitors of hydrogen absorption by metals) [5][6][7][8][9][10], efficiencies of species as biocides e.g. against sulfate reducing bacteria (SRB) [7][8][9][10]; wide range (scope) of medical (pharmaceutical) [21] or, generally, biological activity [11] or properties in relation to important chemical applications (EFG in NQR) [12] of various individual substances can also be well explained by means of analysis of certain quantum chemical characteristics -descriptors QCD [13] available for the respective molecules, provided the chemical structure of corresponding species is known. Best if the species in a series, being in fact different from one another, also have similarities like common structural part.…”

Peculiarities Of Triazoloazepinium Bromides Effect On Steel Microbial Corrosion

“…benzimidazole, quinone [3][4][5][6][7][8], including suggested by us inhibitors-biocides -derivatives of imidoazepinium [9], N-isopropylacetanilide [10], triazoloazepinium acetonitrile [11], pyridine [12].…”