Scrutinizing Factors Affecting the Corrosion Protection of Epoxy Primer by Calcium Hydrogen Orthophosphate and Nano Silica Applying Taguchi Method

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Suleiman Ghorbani: Islamic Azad University, Tehran South Branch, Tehran - Polymer Engineering
Mohammadreza Kalaee: Tehran South Branch - Department of Polymer Engineering

Article's abstract:

The current essay analyzes the anti-corrosion properties of epoxy primers including anti corrosion pigment calcium hydrogen orthophosphate and hydrophobic nano silica with various percentages optimized by using Taguchi experimental design. The impact of influential factors such as the percentage of anti-corrosion pigments, percentage of nano silica and pigment to binder ratio on anti-corrosion properties of epoxy primer based on model L9 Taguchi method was considered and analyzed. The anti-corrosion pigments and nano silica were initially dispersed into epoxy resin, the samples for corrosion testing were practiced on metal panels. Furthermore, a main sample is identified to be compared with the samples chosen by Taguchi experimental method. Electrochemical impedance spectroscopy EIS is applied to study the corrosion inhibition performance of the primers in 3.5 NaCl aqueous solution and salt spray test. To figure out the distribution of nano silica, particles in epoxy resin were detected by scanning electron microscope SEM. The outcomes achieved in this work revealed that solubility of pigment and corrosion inhibition are significant factors influencing corrosion resistance of the epoxy primer. Holistically, it is proved that adding nano silica to epoxy primer made the number of blisters and corrosion products diminish after being exposed to corrosion test. The most appropriate results of the corrosion resistance tests presented in the sample embracing the epoxy primer loaded with 6.5 calcium hydrogen orthophosphate, 3 nano silica and pigment to binder ratio of 1.

Epoxy coatings, Taguchi, Anti corrosion pigments, EIS, SEM

[1] M.R.Heydarpour, A.Zarrabi, M.M.Attar, B.Ramezanzadeh, Studying the corrosion protection properties of an epoxy coating containing different mixtures of strontium aluminum polyphosphate (SAPP) and zinc aluminum phosphate (ZPA) pigments, Progress in Organic Coatings 77 (2014) 160– 167 [2] Xianming Shi, Tuan Anh Nguyen, Zhiyong Suo, Yajun Liu, Recep Avci, Effect of nanoparticles on the anticorrosion and mechanical properties of epoxy coating, Surface

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Prof. Zahra Ranjbar
Dr. Farahnaz Nourmohammadian
Assistant Editor:
Dr. Mozhgan Hosseinnezhad
ISSN (online):
Institute for Color Science and Technology (ICST)

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