ISSN 2305-6894

Aluminium alloy corrosion inhibition by pigments based on ion exchanged zeolite

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1 Karpenko Physico-Mechanical Institute, National Academy of Sciences of Ukraine, 79060 Lviv, Ukraine
2 Institute of Precision Mechanics, Duchnicka 3, 01-796 Warsaw, Poland

Abstract: We developed a complex anti-corrosion pigment based on Ca-ion exchanged nanoporous zeolite powder with deposited zinc phosphate layer. The pigment contains composite fragments as well as individual particles of zinc phosphate. Potentiodynamic polarization studies of the D16T alloy in artificial acid rain revealed that the complex pigment is superior to commercial zinc phosphate and Ca-ion exchanged zeolite. The complex pigment is characterized by cathodic control of aluminum alloy corrosion at the beginning, changing to anodic control after two days of exposure to the corrosion solution due to the formation of a corrosion-resistant film. It was established by electrochemical impedance spectroscopy that the pigment significantly increases charge transfer resistance of aluminium alloy surface in the vicinity of through defect in inhibited paint exposed to an acid rain solution. The anti-corrosion effectiveness of this inhibitor in the coating is higher than zinc phosphate pigment Novinox PZ02 used for alkyd systems. The phase angle frequency dependence of aluminum alloy indicates the formation of a corrosion-resistant film on the metal under the defect of the coating inhibited with the complex zeolite/phosphate pigment. Ion-modified zeolites and their complex pigments with zinc phosphate are promising ecologically safe inhibiting components of paint coatings for anti-corrosion protection of aluminium alloy structures under industrial atmosphere conditions.

Keywords: D16T aluminium alloy, alkyd coating, inhibiting pigments, zeolite, phosphate, corrosion inhibition

Int. J. Corros. Scale Inhib., , 10, no. 2, 541-550 PDF (463 K)
doi: 10.17675/2305-6894-2021-10-2-3

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