Preparation and Properties of Epoxy Anticorrosive Coating for Hot-Dip Galvanized Gas Pipeline
The effects of different epoxy resin,curing agent and pigment/binder ratio on the adhesion,pencil hardness,impact resistance and acid resistance of the coating on the surface of hot-dip galvanized tube substrate were investigated.The result shows that the epoxy E20-polyamide 125 system can reduce the drying time of the coating.The impact resistance of the coating on the surface of the hot-dip galvanized pipe can be improved up to 123.5 cm,meanwhile,it still can reach 95.5 cm after the acid resistance test.When the pigment/binder ratio of the coating is controlled at 1.8 ∶ 1,the overall performance of the coating reaches the best.Before and after the acid resistance test,the performance has not declined,the adhesion still reaches 0 level and the impact resistance still reaches 162.5 cm.Thus,the protective coating for hot-dip galvanized gas pipeline is prepared by using epoxy resin E-20 as the base resin,polyamide 125 as the curing agent and the coating pigment/binder ratio 1.8 ∶ 1.The performance of the coating is significantly better than the technical requirements for the epoxy resin coatings and film thereof as described by “CGAS001-2016 wide-edge pipe connection coating gas pipeline technical regulations”.
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