ANALYSIS OF THE CORROSION BEHAVIOR OF STEEL 3 IN HYDROCHLORIC ACID SOLUTION BY IMPEDANCE SPECTROSCOPY IN THE PRESENCE OF NITROGEN-DOPED QUANTUM DOTS
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
Kazan National Research Technological University
2.
KNITU
Type:
Article
Pages:
from 116
to 120
Status:
Published
Received:
19.01.2026
Accepted:
29.01.2026
Published:
26.02.2026
Language:
Russian
Keywords:
STEEL 3, CARBON QUANTUM DOTS, CORROSION, ACTIVE CENTERS, ELECTROCHEMISTRY, IMPEDANCE, ADSORPTION
Abstract:
Dannaya rabota posvyaschena issledovaniyu zaschitnyh svoystv azot-dopirovannyh uglerodnyh kvantovyh tochek (N-CQDs) kak perspektivnyh i ekologicheski bezopasnyh ingibitorov korrozii nizkouglerodistoy stali v kislyh sredah. Aktual'nost' issledovaniya obuslovlena shirokim primeneniem stali 3 v promyshlennosti i neobhodimost'yu ee zaschity v usloviyah kislotnogo travleniya v rastvorah solyanoy kisloty, kotoroe provociruet razvitie intensivnoy korrozii metalla. V rabote opisany svoystva uglerodnyh kvantovyh tochek N-CQDs, sintezirovannyh iz limonnoy kisloty i mocheviny. Osnovnoe vnimanie udeleno analizu kinetiki korrozionnyh processov na granice razdela stal' 3 / 1,0 M HCl s ispol'zovaniem metodov elektrohimicheskoy impedansnoy spektroskopii (EIS) i potenciodinamicheskih polyarizacionnyh krivyh. Rezul'taty EIS pokazali, chto vvedenie N-CQDs v koncentraciyah 100-250 ppm privodit k znachitel'nomu rostu soprotivleniya perenosu zaryada (Rp) s 141,68 do 412,96 Om.sm2, chto svidetel'stvuet o formirovanii zaschitnogo adsorbcionnogo sloya. Maksimal'naya effektivnost' ingibirovaniya sostavila 65,69% po dannym impedansnyh izmereniy i 67,19% po rezul'tatam ekstrapolyacii tafelevskih uchastkov polyarizacionnyh krivyh pri koncentracii N-CQDs 250 ppm. Analiz polyarizacionnyh diagramm pozvolil klassificirovat' N-CQDs, kak ingibitor smeshannogo tipa, podavlyayuschiy, kak anodnye, tak i katodnye processy. Ustanovleno, chto adsorbciya ingibitora na poverhnosti stali 3 podchinyaetsya izoterme Lengmyura (R2 = 0,99), ukazyvaya na formirovanie monomolekulyarnogo sloya. Na osnovanii raschetnyh znacheniy standartnoy svobodnoy energii adsorbcii ΔG0ads (ot -25 do -30 kDzh/mol') sdelan vyvod o spontannom haraktere processa, protekayuschego po mehanizmu smeshannoy fiziko-himicheskoy adsorbcii. Effektivnost' N-CQDs ob'yasnyaetsya obrazovaniem koordinacionnyh svyazey mezhdu nepodelennymi elektronnymi parami azota i vakantnymi d-orbitalyami zheleza.
Dannaya rabota posvyaschena issledovaniyu zaschitnyh svoystv azot-dopirovannyh uglerodnyh kvantovyh tochek (N-CQDs) kak perspektivnyh i ekologicheski bezopasnyh ingibitorov korrozii nizkouglerodistoy stali v kislyh sredah. Aktual'nost' issledovaniya obuslovlena shirokim primeneniem stali 3 v promyshlennosti i neobhodimost'yu ee zaschity v usloviyah kislotnogo travleniya v rastvorah solyanoy kisloty, kotoroe provociruet razvitie intensivnoy korrozii metalla. V rabote opisany svoystva uglerodnyh kvantovyh tochek N-CQDs, sintezirovannyh iz limonnoy kisloty i mocheviny. Osnovnoe vnimanie udeleno analizu kinetiki korrozionnyh processov na granice razdela stal' 3 / 1,0 M HCl s ispol'zovaniem metodov elektrohimicheskoy impedansnoy spektroskopii (EIS) i potenciodinamicheskih polyarizacionnyh krivyh. Rezul'taty EIS pokazali, chto vvedenie N-CQDs v koncentraciyah 100-250 ppm privodit k znachitel'nomu rostu soprotivleniya perenosu zaryada (Rp) s 141,68 do 412,96 Om.sm2, chto svidetel'stvuet o formirovanii zaschitnogo adsorbcionnogo sloya. Maksimal'naya effektivnost' ingibirovaniya sostavila 65,69% po dannym impedansnyh izmereniy i 67,19% po rezul'tatam ekstrapolyacii tafelevskih uchastkov polyarizacionnyh krivyh pri koncentracii N-CQDs 250 ppm. Analiz polyarizacionnyh diagramm pozvolil klassificirovat' N-CQDs, kak ingibitor smeshannogo tipa, podavlyayuschiy, kak anodnye, tak i katodnye processy. Ustanovleno, chto adsorbciya ingibitora na poverhnosti stali 3 podchinyaetsya izoterme Lengmyura (R2 = 0,99), ukazyvaya na formirovanie monomolekulyarnogo sloya. Na osnovanii raschetnyh znacheniy standartnoy svobodnoy energii adsorbcii ΔG0ads (ot -25 do -30 kDzh/mol') sdelan vyvod o spontannom haraktere processa, protekayuschego po mehanizmu smeshannoy fiziko-himicheskoy adsorbcii. Effektivnost' N-CQDs ob'yasnyaetsya obrazovaniem koordinacionnyh svyazey mezhdu nepodelennymi elektronnymi parami azota i vakantnymi d-orbitalyami zheleza.
Keywords:
STEEL 3, CARBON QUANTUM DOTS, CORROSION, ACTIVE CENTERS, ELECTROCHEMISTRY, IMPEDANCE, ADSORPTION
STEEL 3, CARBON QUANTUM DOTS, CORROSION, ACTIVE CENTERS, ELECTROCHEMISTRY, IMPEDANCE, ADSORPTION
