Addition of surface polysulfide film to the inhibitor protective action against hydrosulfide corrosion of carbon steel

The protective efficiency of a number of nitrogen containing inhibitors against steel hydrosulfide corrosion and their effect on the kinetics of partial electrode reactions have been studied by gravimetrical corrosion tests, polarization resistance and impedance spectroscopy methods. The bactericidal efficiency of the inhibitors with respect to sulfate reducing bacteria (SRB) has been estimated as a function of their nature and concentration.

Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

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Peculiarities of protective efficiency of nitrogen containing inhibitors of steel corrosion

Цыганкова¹,

Вигдорович²,

Shel³

et al. 2013

“…This synergistic effect of the inhibiting additive and H 2 S was explained by the fact that organic additives react chemically with hydrogen sulphide, forming insoluble compounds representing the phase barrier on the metal surface. In [4,5], a method was proposed for estimating the contribution of the inhibitor and shielding film of corrosion products of steel to the overall protective effect in hydrogen sulfide media. For this purpose, measurements of the instantaneous corrosion rate of steel were made during 24 h using a corrosion meter operating on the basis of the polarization resistance method.…”

Section: Introductionmentioning

confidence: 99%

Corrosion of steel in weakly acidic media at low H2S concentrations

2018

The influence of low concentrations of H 2 S (25-200 mg/L) on the corrosion rate of St3 steel in model stratum water was studied by gravimetric, electrochemical methods and the linear polarization resistance method from ten-day experiments. In a simulated solution with pH = 6, an increase in the concentration of H 2 S in the range 25-100 mg/L causes an increase in the protective effect of H 2 S. At 200 mg/L H 2 S, the corrosion rate rises, but remains lower than in the solution without H 2 S. Introduction of an organic inhibitor to solutions containing H 2 S in these concentrations enhances the protective effect. Electron microscopy was used to characterize the state of the metal surface after corrosion. In a simulated solution with a lower pH (3.6), only 25 mg/L of H 2 S causes a decrease in the corrosion rate of the steel.

“…This film often has certain protective properties and leads to a significant decrease in corrosion rate [18][19][20][21][22]. This effect becomes stronger in the presence of an inhibitor [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Effect of the structure of o,o´-dihydroxyazo compounds on bactericidal and inhibitory ability

2017

The paper is devoted to a study of the influence of the molecule structure of a number of o,o´-dihydroxyazo (DHA) compounds on their bactericidal ability toward sulfate-reducing bacteria (SRB) in the Postgate medium at small concentrations (5-20 mg/L). DHA compounds induce a decrease in number of bacterial cells, H 2 S production by SRB, and hydrogen permeation into carbon steel in the presence of SRB. The inhibition of steel corrosion in the bacterial medium by these substances is considered as well.