Iranian Journal of Oil and Gas Science and Technology
Quarterly Publication

Effect of Molar Ratio and Resin Modification on the Protection Properties of Zinc-rich Alkali Silicate Primer

Document Type : Research Paper

Authors

Iman Mirzaie Goodarzi 1
Mansour Farzam 1
Mohammad Reza Shishesaz 1
Davood Zaarei 2

1 Department of Technical Inspection, Petroleum University of Technology, Abadan, Iran

2 Department of Polymer, Technical Faculty, South Tehran Branch, Islamic Azad University, Tehran, Iran

https://doi.org/10.22050/ijogst.2014.5801
Abstract
The influence of increasing the SiO2/K2O molar ratio on the electrochemical action of a waterborne potassium silicate zinc-rich coating was investigated by means of electrochemical impedance spectroscopy (EIS) and corrosion potential (Ecorr) measurements. The EIS results showed that increasing the SiO2/K2O molar ratio in the range of 3.135 to 5 by the addition of nano-SiO2 to the resins improved the resistance of coatings; however, higher molar ratios showed an adverse effect. Moreover, the alkali silicate binder of the sample with a SiO2/K2O molar ratio of 5 was improved by adding 5, 10, and 15 wt.% of acrylic resin and acrylic/styrene copolymer to potassium silicate resin. These formulated coatings were sprayed over carbon steel plates and the adhesion and morphology of these primers were evaluated by pull-off, cross cut, and scanning electron microscopy tests. Electrochemical measurements showed that the sample with a SiO2/K2O molar ratio of 5 had better corrosion properties than the other samples. Adhesion and SEM tests also showed that B1 and C2 with respectively 5 and 10% acrylic derivatives had less holes, cracks, and better adhesive properties.

Keywords

Zn-rich Coating
Molar Ratio
EIS
Adhesion
SEM

  • Receive Date 20 August 2013
  • Revise Date 21 November 2013
  • Accept Date 19 December 2013

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