Evaluation of anti-corrosion properties of MIO pigments in the formulation of synthetic rubber based primer used in gas pipeline

In this research, Micaceous Iron Oxide pigments in different ratios were added to a synthetic rubber primer. Coatings were applied on carbon steel (St 37) plates and 8 inch pipe samples. Corrosion behavior of the primers was investigated by use of Electrochemical Impedance Spectroscopy. In addition, in order to investigate the effects of Micaceous Iron Oxide pigments on the adhesion of the primer to steel substrate, cross-cut test has been corried out on carbon steel substrate. Also the adhesion of synthetic rubber tape to the primer has been investigated by peel adhesion through hanging mass method test on pipeline. Scanning electron microscopy was used to investigate dispersion condition of Micaceous Iron Oxide particles in the binder. The Electrochemical Impedance Spectroscopy results indicated that the BRP 5, (containing 5% wt. of Micaceous Iron Oxide particles) BRP 10 and BRP 15 sample has better performance than neat primer. BRP 10 sample has the best barrier effect on corrosion performance. Results of Peel adhesion test indicate that adhesion to cold applied tape for BRP 10 sample has better than neat primer.