Iranian Researchers Create Smart Anti-Corrosion Self-Healing Zinc

Monday, March 5, 2018 - 11:37

Researchers from Sahand University of Technology have investigated the smart anti-corrosion self-healing zinc metal-based molybdate functionalized-mesoporous-silica (MCM-41) nanocomposite coatings.

According to an ISCA report, composite coatings consisting of organic, inorganic, or hybrid functional materials have found enormous applications in engineering. The anti-corrosion smart coatings are functional and are increasingly being developed to improve corrosion protection.

The molybdate functionalization, which is known as a common corrosion inhibitor, was added as an “anti-corrosive self-healing” agent to the coating to be released during the corrosion process.

The dispersion and bonding of the functional MCM-41 particles in the electrodeposition solution were both improved by adding 3-mercopropyltrimethoxysilane (MPTMS).

Zinc metal base was co-deposited galvanostatically with the MCM-41 particles under conditions that were varied to achieve the smoothest and most corrosion-resistant films.

The open circuit potential of Zn–MCM-41–SH–Mo (SH: silane, Mo: molybdate functionalization) in a chloride solution increases as a function of time owing to the release of Mo as an anodic inhibitor which makes the self-healing functionality in the coating.

The self-healing performance and mechanism of Zn–MCM-41–Mo were investigated by OCP, EIS, and polarization curves. Mesoporous silica particles impregnated with molybdate as a corrosion inhibitor were utilized to create a self-healing factor to reduce the rate of corrosion.

The results illustrate that protective compounds are formed after release of molybdate from mesoporous silica, which contributes to an increase in the corrosion protection. Silane was added to form a stronger barrier layer; besides, silane MPTMS has a self-healing property via two mechanisms.

Firstly, it reduced the porosity of the metal matrix coating which contributes to improved barrier performance. Secondly, silane SH improved the adherence of the coating by make it hydrophobic. The rate of corrosion is reduced in the sequence of Zn–MCM-41–SH–Mo > Zn–Mo functionalized-MCM-41 > Zn–MCM-41–Mo > Zn–MCM-41.

The study was carried out by Katayoon Alipour, MA graduate student, and Farzad Nasirpouri, faculty member of Sahand University of Technology.

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