Piroxicam: 2‐hydroxypropyl‐β‐cyclodextrin complex as corrosion inhibitor for the aluminum anode in extremely alkaline‐based primary batteries. Issue 11 (5th October 2022)

• Record Type: Journal Article
• Authors: Abedini, Amin; Hosseini, Seyed Mostafa
• Is Part Of: Journal of the Chinese Chemical Society. Volume 69:Issue 11(2022)
• Page Start: 1875
• Page End: 1885
• Publication Date: 2022-10-05
• Subjects: aluminum -- corrosion -- electronic materials -- inhibitor -- piroxicam; Chemistry -- Periodicals; Electronic journals; 540.5
• DOI: 10.1002/jccs.202200364
• Languages: English
• ISSNs: 0009-4536

Abstract

Abstract: The corrosion inhibitive capabilities of an aluminum anode in 6 M KOH solution at 50°C with single piroxicam: 2‐hydroxypropyl‐β‐cyclodextrin molecular inclusion complex (PIR: HP‐β‐CD) and mixed PIR: HP‐β‐CD + Na2 SnO3 additives are investigated using hydrogen gas collection, weight loss measurement, electrochemical tests, infrared spectra, and scanning electron microscopy (FESEM). The results indicate that the corrosion inhibition efficiency of PIR: HP‐β‐CD additive is increased to 10 ppm concentration (33%). The PIR: HP‐β‐CD adsorbs on the aluminum surface and impedes the accessibility of water to the surface. On the other hand, using only 0.002 M Na2 SnO3 reduced aluminum's anodic dissolution and did not provide sufficient efficiency in inhibiting hydrogen evolution. However, adding 10 PIR: HP‐β‐CD to KOH solution containing 0.002 M Na2 SnO3 has created a synergistic effect in corrosion inhibition. The highest electrochemical activity, the lowest hydrogen evolution rate (4.48 ml cm −2 s −1 ), the highest inhibition efficiency (81.14%), and the highest capacity are attained in the 6 M KOH solution with the mixed additives. Indeed, the 10 ppm PIR: HP‐β‐CD + 0.002 M Na2 SnO3 additives could be recommended as an excellent corrosion inhibitor in extremely alkaline electrolytes for the aluminum anode at high current densities. Abstract : Adding 10 PIR: HP‐β‐CD to KOH solution containing 0.002 M Na2 SnO3 has created a synergistic effect in corrosion inhibition (81.14%). The 10 ppm PIR: HP‐β‐CD + 0.002 M Na2 SnO3 additives could be recommended as an excellent corrosion inhibitor in extremely alkaline electrolytes for the aluminum anode at high current densities.