The synergistic effect of Na₃PO₄ and benzotriazole on the inhibition of copper corrosion in tetra‐n‐butylammonium bromide aerated aqueous solution

Abstract

The effect of Na 3 PO 4 and the mixture of benzotriazole (BTA) and Na 3 PO 4 (SP) on the corrosion of copper in 17 wt% (0.534 mol/L) 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 scanning electron microscopy/energy dispersive X-ray techniques. The experimental results showed that a dosage of Na 3 PO 4 stimulated the copper corrosion, and the corrosion rate increased with increasing Na 3 PO 4 concentration, whereas the mixture of BTA and Na 3 PO 4 could protect copper in aqueous TBAB solution. The inhibition action of the mixture of BTA and Na 3 PO 4 on the corrosion of copper is mainly due to the inhibition of the anodic process of corrosion. The inhibition efficiency of a mixture consisting of 2 g/L BTA and 1 g/L Na 3 PO 4 was about 96%. The mixture of BTA and Na 3 PO 4 inhibits the corrosion of copper better than BTA by itself, indicating that Na 3 PO 4 has a synergistic role with BTA on the corrosion inhibition of copper in TBAB aqueous solution.

Corrosion of Cu in Antifreeze Solutions with Triazine- or Triazole-Type Corrosion Inhibitors for 3 Weeks

“…Solutions no1~no4 were made of the antifreeze solution with molybdate, and solutions no5 and no6 were made with nitrite. The corrosion inhibitors in this study were variations of triazole- [6,8,9] and triazinetype [7,10] inhibitors. 2,4,6-Tirs(5-carboxypentylamino)1,3,5-triazine, 2,4,6-Tris(11-carboxyundecylamino)1,3,5-triazine, 1-Aminomethyl(N′N′-di(2-hydroxyethyl)tolutriazole, and 1-Aminomethyl(N′,N′-di(2-hydroxyethyl)benzotriazole were synthesized and added into the antifreeze solutions with the concentration of 0.2~1 wt.%, as described in Table 1.…”

Composite protective effect of benzotriazole and 2-mercaptobenzothiazole on electroplated copper coating

“…Researches have conrmed that BTAH can form a complex protective lm of Cu(I)-BTA on the copper surface, but this reaction can only occur when the concentration of Cu + reaches a certain level. 10,11,15,16 As shown in Fig. 1, the dissolution reaction of copper coating lasted for a long time in the BTAH system, and the complex lm began to gradually form aer 127 s. However, MBT mainly protects the copper coating by chemical adsorption.…”

“…2h), and so the corrosion reaction easily occurs at the defect site of the MBT lm, resulting in pitting corrosion. 16,24,37 Here, the equivalent circuit of R(Q(L(QR))) can be used to simulate the corrosion process. However, a complete and uniform passivation lm including BTA-Cu(I) complex products and MBT-Cu(I) adsorbates is formed on the surface of copper coating aer composite passivation treatment by BTAH + MBT.…”

Triazoles as a class of multifunctional corrosion inhibitors. A review. Part I. 1,2,3-Benzotriazole and its derivatives. Copper, zinc and their alloys

“…There are cases where synergists for the protection of copper from corrosion in aqueous solutions are chemical compounds that themselves are not CIs for this metal. The mixture of Na 3 PO 4 with BTA in a 17% aqueous tetra-n-butylammonium bromide (TBAB) solution, a wellknown coolant carrier, is indicative [48]. The addition of trisodium phosphate, which slows down the corrosion of steel, only accelerates it for copper, but its formulation with BTA protects this metal more efficiently than the triazole itself.…”

“…Of the greatest interest are mixtures based on BTA that have a high protective ability with respect to several metals. Such an example is given by a combination with Na 3 PO 4 studied by Liu et al [48,91,92] for the corrosion inhibition of copper, carbon steel and zinc. The mixture of the nearest BTA analogue, 3-methyl-BTA (TTA), with sodium heptanoate CH 3 (CH 2 ) 5 COONa shows a synergism in zinc protection, which according to [93] is due to co-precipitation of water-insoluble Zn 2+ compounds with CI components.…”