Inhibition properties of benzimidazole-based compounds on crystalline and amorphous CuZr alloys

摘要

CuZr alloys are the basis of a family of metallic glasses with large glass forming ability and remarkable mechanical properties. However, they are susceptible to corrosion although they show an improved corrosion resistance compared to crystalline alloys with similar composition. The use of organic corrosion inhibitors is a promising strategy to improve the corrosion performance of such alloys. Furthermore, the interaction mechanism of organic inhibitors on metal surfaces depend on both the inhibitor and metal surface chemistry. Thus, the possibility of checking the same inhibitors against different surface topologies with the same species may offer additional information on the inhibitor-metal interaction. In this study, we evaluate interactions of nine imidazole/benzimidazole and 2-hydroxy-benzimidazole compounds on crystalline and amorphous Cu_xZr_(100-x)(x = 40, 50, 64). To this end, we utilize linear polarization resistance mesurements (LPR) and electrochemical impedance spectroscopy (EIS). Results show a better performance of 2-Mercapto-1-methylimidazole probably due to a preferential interaction with Zr atoms.