Mn-Mg based zinc phosphate and vanadate for corrosion inhibition of steel pipelines transport of CO2 rich fluids

► The transport of CO2 rich fluids requires economical coatings for CO2 pipeline. ► Vanadate embedded in phosphate coating is low cost coating system for CO2 pipelines. ► Porous phosphate crystal can be used as a carrier for vanadate inhibitor. ► Phosphate coating plus vanadate can protect steel under acidification by H2CO3. ► The inhibition efficiency of modified phosphate coating is nearly 70% at pH > 3.