Nanocomposites and nanomaterials
Application of zeolite/phoshate pigments for corrosion inhibition
Danyliak M.-O.M., Korniy S.A., Zin I.M., Bilyi L.M.
Karpenko Physico-Mechanical Institute of the NAS of Ukraine. 
Naukova str., 5, Lviv-79060, Ukraine. 
E-mail: danyliak-olena@ukr.net
Zeolites are nanocrystalline aluminosilicate with 3D porous structure, which use as containers in paint coating [1]. Corrosion protection performance zeolites increased by different phosphate pigments.
In this study, a zeolite with phosphate was invastigated as an anticorrosion pigment to enhance the corrosion protection of the aluminum alloy. The zeolite/phosphate mixture was milled by high energy planetary ball mill.
The electrochemical behavior of the aluminum alloy with milled complex zeolite/phosphate pigment was studied by potentiodynamic polarization method. The polarization characteristics were recorded by a Cor–500 potentiostat, using a saturated Ag/AgCl reference electrode and a counter platinum electrode. The potential scan rate during experiments was 1 mV/s. 
Potentiodynamic polarization studies of the D16T alloy in 0.1% NaCl solution with pigments suspensions showed (table 1), that the complex “milled zeolite/ Zn(H2PO4)2” is significantly effective compared to solution with the addition of separate milled zeolite or complex “milled zeolite/CaHPO4”.

Table 1. The electrochemical characteristics of the D16T alloy.
Medium	Еcorr, V	icorr, mA/cm2	
0.1% NaCl solution	-0,54	0,45·10-2	
0.1% NaCl solution with the addition
of milled zeolite	-0,48	0,22·10-2	
0.1% NaCl solution with the addition
of zeolite milled with Zn(H2PO4)2	-0,49	0,03·10-2	
0.1% NaCl solution with the addition
of zeolite milled with CaHPO4	-0,52	0,07·10-2	

The corrosion resistance of the aluminum alloy in suspensions of complex zeolite/phosphate pigments is increased in about 6-15 times compared with the uninhibited corrosion medium.

1.	Banerjee P. Ch., Woo R. P., Grayson S. M., Majumder A., Raman R. K. S. Influence of zeolite coating on the corrosion resistance of AZ91D magnesium alloy // Materials.-2014.-7.-P. 6092-6104.