Work

Efficient corrosion inhibition mechanism of barbituric acid and sodium phosphate on AZ91 Mg alloys in NaCl solution

Year: 2025

Type: article

Abstract: Abatract The surface of the Mg alloy develops a stable and dense film of corrosion products through the synergistic interaction of barbituric acid (BA) and sodium phosphate (SP). The combination of SP and BA exhibits a strong corrosion inhibition effect, with a corrosion inhibition efficiency of 83.67% observed in mass loss experiments. Furthermore, electrochemical tests reveal a corrosion inhibition efficiency of 94.04%. SP predominantly forms a protective Mg 3 (PO 4 ) 2 layer by reacting with Mg, effectively shielding the Mg surface from the corrosive environment. Theoretical calculations indicated that BA tends to align in a nearly parallel orientation on the Mg (0 0 1) surface. Moreover, BA inhibits the cathodic reaction by adsorbing onto the Mg surface and promotes the activation of Mg on the surface. The synergistic action of SP and BA enhances the efficacy of inhibiting Mg alloy corrosion by creating a protective film and adsorbing to prevent further reactions.

Source: Corrosion Communications

DOI: 10.1016/j.corcom.2024.08.003

Authors: Yan Li, Zhaoyun Gao, Hongbing Wang, Xingchuan Zhao, Tao Zhang, Fuhui Wang

Institutions: Liaocheng University, Northeastern University

Language: English

Topic: Magnesium Alloys: Properties and Applications

Subfield: Biomaterials

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,800

Funders: Hubei Provincial Key Laboratory of Metallurgical Industry Process System Science, National Natural Science Foundation of China, Liaocheng University, Natural Science Foundation of Shandong Province