Evaluation of cathodic protection behavior of waterborne inorganic zinc‐rich silicates containing various contents of MIO pigments

Purpose – The aim of this paper is to study the corrosion protection behavior of water‐borne inorganic zinc‐rich coatings based on potassium silicate/nanosilica developed with various zinc and micaceous iron oxide (MIO) contents during cathodic protection stage.Design/methodology/approach – The formulated coatings were applied on carbon steel panels and were subjected to electrochemical impedance spectroscopy (EIS) and free corrosion potential measurements for characterization of corrosion protection behavior. Also atomic force microscopy (AFM) and optical microscopy were used to investigate the surface topography of coatings.Findings – All of the coatings preserved the cathodic protection ability throughout 75 days of exposure to 3.5% NaCl solution. Supporting results of electrochemical tests and microscopic observations revealed that replacement of zinc by MIO particles reduced both the rate of reactivity and the duration of cathodic protection of inorganic zinc‐rich coatings. It was observed that the c...

[1]  T. H. Yun,et al.  The improvement of anticorrosion properties of zinc-rich organic coating by incorporating surface-modified zinc particle , 2012 .

[2]  K. C. Park,et al.  Study on corrosive electrochemical behaviors of zinc‐rich and graphite‐filled epoxy coatings in 3.5 wt% NaCl solution , 2011 .

[3]  E. Han,et al.  The corrosion behavior of zinc-rich paints on steel: Influence of simulated salts deposition in an offshore atmosphere at the steel/paint interface , 2011 .

[4]  G. Guillemot,et al.  The Corrosion Protection Behaviour of Zinc Rich Epoxy Paint in 3% NaCl Solution , 2011 .

[5]  F. Sharif,et al.  Synthesis and evaluating corrosion protection effects of emeraldine base PAni/clay nanocomposite as a barrier pigment in zinc-rich ethyl silicate primer , 2011 .

[6]  K. Dam-Johansen,et al.  Anticorrosive coatings: a review , 2009 .

[7]  A. S. Solov’ev,et al.  Protective Properties of Zinc-Rich Coatings: An Impedance Method Estimate , 2004 .

[8]  E. Bardal.  Corrosion and Protection , 2004 .

[9]  J. Hu,et al.  Electrochemical behavior of organic and inorganic zinc-rich coatings in 3.5% NaCl solution , 2003 .

[10]  J. R. Vilche,et al.  Application of EIS and SEM to evaluate the influence of pigment shape and content in ZRP formulations on the corrosion prevention of naval steel , 2002 .

[11]  M. Morcillo,et al.  Deterioration of Cathodic Protection Action of Zinc-Rich Paint Coatings in Atmospheric Exposure , 2001 .

[12]  D. Srivastava,et al.  Ethyl silicate binders for high performance coatings , 2001 .

[13]  C. M. Abreu,et al.  A new approach to the determination of the cathodic protection period in zinc-rich paints , 1999 .

[14]  C. Hare.  ZINC-RICH PRIMERS I: DESIGN PRINCIPLES , 1998 .

[15]  M. Morcillo,et al.  A new pigment to be used in combination with zinc dust in zinc‐rich anti‐corrosive paints , 1998 .

[16]  M. Selvaraj,et al.  The electrochemical aspects of the influence of different binders on tne corrosion protection afforded by zinc-rich paints , 1997 .

[17]  C. M. Abreu,et al.  Electrochemical behaviour of zinc-rich epoxy paints in 3% NaCl solution , 1996 .

[18]  J. R. Vilche,et al.  An electrochemical impedance spectroscopy study of zinc rich paints on steels in artificial sea water by a transmission line model , 1993 .

[19]  J. R. Vilche,et al.  Zinc-Rich Paints on Steels in Artificial Seawater by Electrochemical Impedance Spectroscopy , 1992 .

[20]  X. Nóvoa,et al.  The Mechanism of Protection of Zinc-Rich Inorganic Coatings. A Study Based on Electrochemical Impedance Spectroscopy (EIS) , 1992 .

[21]  M. Morcillo,et al.  EFFECT OF THE DI-IRON PHOSPHIDE CONDUCTIVE EXTENDER ON THE PROTECTIVE MECHANISMS OF ZINC-RICH COATINGS , 1991 .

[22]  M. Morcillo,et al.  ZINC REACTIVITY IN ZINC-RICH COATINGS CO-PIGMENTED WITH DI-IRON PHOSPHIDE , 1991 .

[23]  J. Scantlebury,et al.  The application of electrochemical measurements to the study and behaviour of zinc-rich coatings , 1990 .

[24]  P. Merino,et al.  Electrochemical Impedance Spectroscopy and Zero Resistance Ammeters (ZRA) as Tools for Studying the Behaviour of Zinc-Rich Inorganic Coatings , 1991 .