Evaluation of the effect of sodium alginate, hydroxyethyl cellulose, aspartame, and poly(ethylene oxide)-b-poly(propylene oxide) copolymer on the in-vitro corrosion of AZ31 Mg alloy in simulated body fluid.
Abdulrahman A Aleid, Moses M Solomon, Peace S Umoren, Saviour A Umoren
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引用次数: 0
Abstract
Research on Mg-based implants has increased recently because of their compatibility and biodegradability. Despite this promise, challenges related to high corrosion rates hampered wide-scale deployment. This paper explores the inhibiting properties of biomacromolecules, sodium alginate (ALG), hydroxyethyl cellulose (HEC), aspartame (ASP), and poly(ethylene oxide)-b-poly(propylene oxide) copolymer (PEO-b-PPO) on AZ31 Mg alloy in simulated body fluid at 37 °C. Results revealed that PEO-b-PPO accelerated, ALG insignificantly inhibited, while ASP and HEC showed moderate inhibition. At 2000 ppm, ASP and HEC offered 54 % and 53 % protection after 48 h and over 65 % if blended. Mechanistic insights were gained via XPS, FTIR, and distribution of relaxation times (DRT) analysis. Three corrosion mechanisms, Cl- transport, charge transfer, and ion transport across inherent MgO lattice are revealed by DRT and occurred at f = 5 Hz, f = 21 Hz and 832 Hz, and f = 100,000 Hz. Inhibitors' presence prolonged the relaxation time or changed the frequency of occurrence. Carbonates (Mg, Ca), hydroxides (Mg), and phosphates are the main corrosion products. Adsorbed ASP and HEC molecules are mixed with these products to protect the alloy. These findings offer a better understanding of the underlying mechanisms that could facilitate the development of target-oriented corrosion inhibitors for Mg.
期刊介绍:
The International Journal of Biological Macromolecules is a well-established international journal dedicated to research on the chemical and biological aspects of natural macromolecules. Focusing on proteins, macromolecular carbohydrates, glycoproteins, proteoglycans, lignins, biological poly-acids, and nucleic acids, the journal presents the latest findings in molecular structure, properties, biological activities, interactions, modifications, and functional properties. Papers must offer new and novel insights, encompassing related model systems, structural conformational studies, theoretical developments, and analytical techniques. Each paper is required to primarily focus on at least one named biological macromolecule, reflected in the title, abstract, and text.