PROCEEDINGS OF THE SHEVCHENKO SCIENTIFIC SOCIETY

Chemical Sciences

Archive / Volume LXVI 2021

Svitlana HALAICHAK, Mariia-Olena DANYLIAK, Ivan ZIN, Olga KHLOPYK, Myroslav HOLOVCHUK, Bohdan DATSKO, Yaroslav ZIN, Sergiy KORNIY

Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine 5 Naukova str., Lviv 79601, Ukraine
e-mail: svityliagolovey@gmail.com

DOI: https://doi.org/10.37827/ntsh.chem.2021.66.080

INFLUENCE OF MODIFICATION OF ZEOLITE BY CATIONS OF DIVALENT METALS ON SORPTION AND CORROSION PROPERTIES

The adsorption characteristics of zeolites, structural type Na-A, pre-modified with divalent metals – Ca, Mn, Zn, in acid rain for 1, 3, 20, 24, 48, 120, 144 and 168 hours were studied. It was found that the largest number of cations is desorbed from zeolite modified with calcium. When the zeolite modified with calcium ions interacts with acid rain (pH 4.5), the cations were desorbed from the zeolite, and negative charge occured at the places where calcium was localized. To compensate for this charge, H+ cations were absorbed by the zeolite, as a result of which the pH of the medium increased, and the CaOH+ cation began to form, with subsequent conversion to calcium hydroxide. When the zeolite interacts with acid rain, successive desorption-adsorption processes took place. The concentration of calcium cations in desorption was 3.5–5.0, and in adsorption was 2.0–3.0 mg/l. The concentration of desorbed manganese cations during was 1…48 h of exposure is ~0.13±0.02 mg/l, after 120 hours – ~0.04 mg/l. For Zinc, the maximum concentration of cations was observed for 1 h – 0.82 mg/l, then it decreased by ~2 times, and stabilized after 20 hours of exposure at the level of 0.27±0.03 mg/l. In the desorption of Zinc cations after 20 hours of exposure, its concentration remained stable, so such zeolites can be use as inhibitors.
It was found that the corrosion rate of D16T aluminum alloy in 0.1% NaCl solution in the case of Zn-zeolite inhibitor after 30 days of exposure was reduced by ~12 times, and after 50 – by ~3 times. Analysis of the surface of the aluminum alloy after 30 days of exposure revealed the absence of corrosion products on its surface, and after 50 days – they began to form. The degree of protection of the D16T alloy decreased by ~27% with increasing exposure from 30 to 50 days. As the duration of exposure increased to 50 days, the corrosion rate loft down of the D16T aluminum alloy in 0.1% NaCl solution slows down, which was obviously due to certain diffusion limitations due to the shielding of the surface by corrosion products. In the case of exposure to suspension of Zn-zeolite, the corrosion rate of the alloy D16T was reduced by ~3 times, which was obviously due to the slow accumulation of corrosion products on the surface. The degree of protection was 91.8 and 64.6% for 30 and 50 days, respectively. According to the analysis of the obtained results, it is recommended to use zeolites modified with Zinc cations.

Keywords: adsorption, zeolites, inhibition, modification, corrosion.

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How to Cite

HALAICHAK S., DANYLIAK M.-O., ZIN I., KHLOPYK O., HOLOVCHUK M., DATSKO B., ZIN Ya., KORNIY S. INFLUENCE OF MODIFICATION OF ZEOLITE BY CATIONS OF DIVALENT METALS ON SORPTION AND CORROSION PROPERTIES. Proc. Shevchenko Sci. Soc. Chem. Sci. 2021 Vol. LXVI. P. 80-89.

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