PROCEEDINGS OF THE SHEVCHENKO SCIENTIFIC SOCIETY

Chemical Sciences

Archive / Том LVI 2019

Myroslav KHOMA, Svitlana HALAICHAK, Vasyl IVASHKIV, Maryan CHUCHMAN, Yuliya MAKSISHKO

Karpenko physico-mechanical institute of the National Academy of Sciences of Ukraine 5 Naukova str., Lviv 79601, Ukraine

DOI: https://doi.org/10.37827/ntsh.chem.2019.56.071

INFLUENCE OF IRON SULFIDES ON RATE OF OXIDATION-REDUCTION PROCESSES ON STEELS DIFFERENT STRUCTURES IN CHLORIDE-ACETATE SOLUTIONS

On the basis voltage-curves of 0.8% C steel in chloride-acetate solutions shows that the determining factor of corrosion depends on its structure. Corrosion of perlite and martensite runs under the mixed cathode-anode control with rate 0.08 and 0.12 mA/cm2, and sorbite and troostite – for anode with rate 0.205 mA/cm2. At presence of sulfides the rate of anode processes predominantly decreases with the exception of the troilite FeS on the troostite, where their rate increases by ~1.6 times. The rate of cathode processes on perlite and sorbite with sulfide films increases by ~15…63%. Pyrite FeS2 in sorbite slows them by ~25%, and kanzite Fe9S8 accelerates by ~50%. FeS and Fe9S8 on steel with martensite structure activate cathode reactions by 35...53%. FeS on sorbite and FeS2 on martensite practically not affect to them. Consequently, the presence of iron sulfides on surface 0.8%C steel leads to decreases the corrosion rate and its by anode processes determined, that are slowing down, while the cathodes are predominantly accelerating. The corrosion rate, as a result of which, by the oxidation reaction is determined. The cathode processes rate on 0.45% C steel is the lowest in sorbite and troostite, and in perlite and martensite higher, respectively, ~35 and ~10% is established. The rate of anodic processes, the lowest on troostite and ferrite perlite, somewhat higher on sorbite and almost twice in martensite. The troostite electrode corrodes under the mixed cathode-anode control, ferrito-perlite – for the anode, and martensite and sorbite for cathode control. Iron sulfides increases the rate of oxidation of 0.45% C steel: most significantly – FeS2 on ferrite perlite and martensite. The slightest effect with the films Fe9S8 is observed. FeS2 on sorbite and troostite increases the rate of cathode processes by ~13.2 and ~88.3%, respectively, on martensite it reduces by about 45.1%, and practically does not change them in ferrito-perlite. The presence of FeS, their rate increases in 1.4...2.0 times in all structures, except for ferrito-perlite, where the cathode reactions flow more slowly ~1,2 times. The presence on steel of Fe9S8, regardless of the structure of steel, increases the rate of cathode processes. The greatest growth on perlite and sorbite at ~2.3...2.4 times is observed. With the presence on the surface of 0.45% C steel FeS corrosion processes runs under the cathodic control, and Fe9S8 – anodic. In the presence FeS2, its controlled by cathode processes, and on troostite – anode. Consequently, the effect of iron sulfides on corrosion rate depends from structure of steel: they reduce its on the 0.8% C steel, and on 0.45% C steel is preferably increase.

Keywords: U8 steel, 45 steel, structure, corrosion.

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How to Cite

KHOMA M., HALAICHAK S., IVASHKIV V., CHUCHMAN M., MAKSISHKO Y. INFLUENCE OF IRON SULFIDES ON RATE OF OXIDATION-REDUCTION PROCESSES ON STEELS DIFFERENT STRUCTURES IN CHLORIDE-ACETATE SOLUTIONS Proc. Shevchenko Sci. Soc. Chem. Sci. 2019 Vol. LVI. P. 71-79.

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