Protective Properties of Alkyd Coatings Inhibited by Complex Zeolite-Phosphate Pigment
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PROTECTIVE PROPERTIES OF ALKYD COATINGS INHIBITED BY COMPLEX ZEOLITE-PHOSPHATE PIGMENT I. M. Zin,1,2 S. A. Kornii,1 A. R. Kytsya,3 L. M. Bilyi,1 M.-O. M. Danylyak,1 and P. Ya. Lyutyi1
UDC 620.197
We study a complex anticorrosion pigment based on calcium-containing zeolite with zinc phosphate precipitated on its nanoporous surface. It is discovered that this pigment efficiently retards corrosion in an aluminum alloy placed in a synthetic acid medium and inhibits the subfilm corrosion of the metal near defects of the alkyd paint coating. The proposed pigment may serve as a promising inhibiting component of paint coatings aimed at the protection of structures made of aluminum alloy in the industrial atmosphere. Keywords: aluminum alloy, alkyd coating, inhibiting pigments, zeolite, zinc phosphate, electrochemical impedance spectroscopy.
Introduction Zeolites belong to a group of aqueous aluminum silicates of alkaline and alkaline-earth metals with tetrahedral structure. Their structures contain up to 50 vol.% of nanosized pores occupied by sodium, potassium, calcium, and magnesium cations and water molecules [1]. The cations are weakly bound to the aluminum silicate base of zeolite and can be partially or completely replaced as a result of ion exchange. This enables us to conclude that zeolites are promising fillers for paint coatings because they can guarantee their ordered structuring and improved barrier characteristics. At the same time, the ability of zeolites to participate in ion exchange can be important for the production of inhibiting pigments for paint primer coatings based on zeolites. In [2], it was proposed to use zeolites modified with cations of alkaline-earth metals as corrosion inhibitors for alkyd coatings on galvanized steels. It was shown [3] that modified zeolite pigments protect steels both by the barrier action and by the interaction with alkyd resin leading to the formation of salts of fat acids passivating the metal substrate. It is worth noting that, unlike toxic chromates, these pigments are environmentally safe. However, the efficiency of pigments of ion-exchange type is insufficient, as compared with chromate anticorrosion pigments [4]. At the same time, it was discovered that the corrosion protection of aluminum alloys by polyurethane coatings inhibited by calcium-containing zeolite in combination with zinc phosphate becomes much better [5]. As promising materials, we can also mention complex inhibiting pigments of the “core + shell” type in which the core is a low-cost mineral and the shell is formed as a result of deposition of various anticorrosion compounds (including phosphates) on the surface of the core by using different methods [6, 7]. 1 2 3
Karpenko Physicomechanical Institute, National Academy of Sciences of Ukraine, Lviv, Ukraine. Corresponding author; e-mail: [email protected].
Division of Physical Chemistry of Fuel Deposits, Lytvynenko Institute of Physicoorganic Chemistry and Coal Chemistry, National Academy of Sciences of Ukraine, Lviv, Ukraine.
Translated from Fiz
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