Conclusions
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1.
The method of testing the steel at a low strain rate gives reproducible results and makes it possible to rank correctly the inhibitors on the basis of the protective effect in a 15% NaCl solution, saturated with hydrogen sulfide and CO2, at 100°C.
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2.
Of the examined components of the solution, corresponding to the minearlized working medium, the most negative effect on the resistance to sulfide cracking both at 25°C and at 100°C, is exerted by hydrogen sulfide, with the effect of CO2 being also appreciable; addition of sodium chloride increases the resistance of APIX46 steel in comparison with its resistance in distilled water.
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3.
In this solution, the maximum protective effect of APIX46 steel is shown by the Neftekhim-3 inhibitor at all examined concentrations (100–1000 mg/liter). The protective effect of the Kaspii-2 inhibitor was detected only at concentrations higher than 400 mg/ liter. A Travis 1100 V inhibitor can also be used efficiently at these concentrations.
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4.
In the chloride solution saturated with hydrogen sulfide and CO2 at 100°C SM90SSU steel is not susceptible to sulfide cracking at a concentration of Neftekhim-3 inhibitor higher than 100 mg/liter. However, the concentration of Kaspii-2 and Travis 1100 V inhibitors should be higher than 200 mg/liter.
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5.
In the standard NACE solution at 25°C the protective effect is exerted by all inhibitors in the concentrations reaching 1400–2000 mg/liter. The efficiency decreases in the sequence: Kaspii-2 > Neftekhim-3 > Travis 1100 V.
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6.
To obtain reliable data on protective effect of the inhibitors in the service conditions it is necessary to develop a method of autoclave tests of specimens at a low strain rate. In this case, it is useful to ensure that the parameters (pressure and temperature) are similar to those in industry, and the main components determining the corrosion-mechanical strength of metals should also be considered.
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7.
While the imported Travis 1100 V inhibitor efficiently protects the steel in the service conditions, the Soviet inhibitors Neftekhim-3 and Kaspii-2 at the appropriate concentration (see paragraphs 3, 4) are superior to the imported inhibitor.
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Translated from Fiziko-Khimicheskaya Mekhanika Materialov, Vol. 27, No. 4, pp. 25–33, July–August, 1991.
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Enikeev, E.K., Getmanskii, M.D., Melekhov, R.K. et al. Evaluation of the protective effect of inhibitors of corrosion, hydrogen charging, and sulfide cracking of line pipe steels. Mater Sci 27, 353–360 (1992). https://doi.org/10.1007/BF00723224
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DOI: https://doi.org/10.1007/BF00723224