Protective properties of mechanochemically fabricated zeolite/phosphate anticorrosion pigments for paint coatings

The anticorrosion environmentally friendly pigments based on synthetic zeolite and zinc and calcium phosphates were prepared by mechanochemical method. The surface morphology and chemical composition of the obtained pigments were determined by scanning electron microscopy and energy-dispersive X-ray spectroscopy, respectively. It was established that the modification of zeolite by phosphates of divalent metals causes a decrease in the particle size and an increase in the specific surface area of the obtained composite pigments. It was shown that the use of zeolite/phosphate pigments increases the corrosion resistance of the aluminium alloy in 0.1% aqueous NaCl solution. The addition of complex zeolite/phosphate pigments to the sodium chloride solution decelerates the anodic process of electrochemical corrosion, which indicates the formation of a protective film on the metal surface. The composite pigment zeolite/Zn(H2PO4)2 exhibited the highest anticorrosive effect. A gradual release of the inhibitory components from these environmentally friendly pigments provides their long-term action to protect metal products.

[1]  S. А. Kornii,et al.  Influence of the Surface Chemical Treatment of D16T Alloy on the Protective Properties of Alkyd Coatings , 2019, Materials Science.

[2]  Ji-Ming Hu,et al.  A one-step preparation of inhibitor-loaded silica nanocontainers for self-healing coatings , 2018, Corrosion Science.

[3]  T. Tsai,et al.  Whole pH range anti-corrosion property of aluminium alloy coated with MFI zeolite film , 2018 .

[4]  A. Kalendová,et al.  The anticorrosion properties of pigments based on molybdates and tungstates surface-modified with conducting polymers , 2017 .

[5]  S. Lyon,et al.  Advances in corrosion protection by organic coatings: what we know and what we’d like to know , 2020 .

[6]  E. Alibakhshi,et al.  Sodium zinc phosphate as a corrosion inhibitive pigment , 2014 .

[7]  V. Pokhmurskii,et al.  Aluminium alloy corrosion inhibition by chromate‐free composition of zinc phosphate and ion‐exchanged zeolite , 2013 .

[8]  V. Pokhmurskii,et al.  Corrosive wear of aluminium alloy in presence of phosphate , 2012 .

[9]  M. Kendig Evaluation of Corrosion Inhibiting Pigments , 2010 .

[10]  Tao Zhang,et al.  The role of a zinc phosphate pigment in the corrosion of scratched epoxy-coated steel , 2009 .

[11]  I. Costa,et al.  Investigation of the corrosion behaviour of AA 2024-T3 in low concentrated chloride media , 2008 .

[12]  I. Aoki,et al.  Microstructural and electrochemical characterization of environmentally friendly conversion layers on aluminium alloys , 2003 .

[13]  F. Mansfeld,et al.  Pitting and Passivation of Al Alloys and Al‐Based Metal Matrix Composites , 1990 .