Nanocomposites and nanomaterials

The anticorrosion performances of the zeolite/Zn(H2PO4)2 pigment for aluminium alloy
Danyliak M.-O.M., Khlopyk O.P., Zin I.M., Korniy S.A.
Karpenko Physico-Mechanical Institute of NAS of Ukraine. 
Naukova str., 5, Lviv-79060, Ukraine. 
E-mail: danyliak-olena@ukr.net

One of the common methods of protecting metal structures from corrosion is paint coatings, which must have high durability in corrosive environments and at the same time be environmentally friendly. Inhibiting pigments are used to increase their anti-corrosion properties [1]. The aim of this work was to study the corrosion inhibition of aluminium alloy by zeolite/Zn(H2PO4)2 pigment. The corrosion resistance of the aluminium alloy in 0.1% NaCl solution with the addition of pigment was studied by the potentiodynamic polarization method, using a saturated Ag/AgCl reference electrode and a counter platinum electrode. Inhibiting effectiveness of the mechanochemically obtained zeolite/phosphate pigment at different components ratios was evaluated (fig. 1). The corrosion resistance of the alloy is significantly increased in the solution with the pigment extract compared to the non-inhibited solution. The greatest anti-corrosion effect is established for zeolite/Zn(H2PO4)2 pigment with a concentration of 1 g/l at a 1:1 components ratio, probably due to optimal solubility of its phosphate phase.
	
Fig. 1. Polarization curves of D16T alloy after 96 h exposure in: 1 - 0.1% NaCl solution and with the addition of the pigment (1 g/l) at different zeolite/Zn(H2PO4)2 ratios: 2 - 3:1; 3 - 1:1; 4 - 1:3	

1.	Zin I.М., Korniy S.А., Danyliak M.-O.М., Khlopyk O.P., Holovchuk M.Ya. Anti-corrosion protection of aluminium alloy by zeolite doped with zinc, calcium and manganese cations // Int. J. Corros. Scale Inhib.-2021.-10, N 4.-P. 1715-1728.

The work was performed within the project № 2020.02/0063 “Synthesis and properties of new complex anti-corrosion pigments for paint coatings based on aluminosilicate nanocontainers” of the National Research Foundation of Ukraine.