Corrosion inhibition of zinc in tetra-n-butylammonium bromide aerated aqueous solution by benzotriazole and Na3PO4

a-[ordm BTA or Na3PO4 or inhibitor mixture could protect zinc in aqueous TBAB solution. a-[ordm The BTA/Na3PO4 mixture showed a synergistic effect in the corrosion inhibition. a-[ordm The inhibition efficiency was found to increase with increasing BTA concentration. a-[ordm The lowest corrosion rate by weight-loss test was 0.71mgma degree 2 ha degree 1. The effect of benzotriazole (BTA), Na3PO4 and their mixture on the corrosion of zinc in 17wt.% (0.534molla degree 1) tetra-n-butylammonium bromide (TBAB) aerated aqueous solution has been investigated by means of weight-loss test, potentiodynamic polarization test, electrochemical impedance spectroscopy (EIS) and SEM/EDX techniques. The experimental results showed that BTA or Na3PO4 or inhibitor mixture could protect zinc in aqueous TBAB solution. The inhibitor combinations led to higher efficiencies compared to those obtained when added individually. An inhibition efficiency of an inhibitor mixture consisting of 0.5gla degree 1 BTA and 1gla degree 1 Na3PO4 was more than 97%.