Journal
GREEN CHEMISTRY
Volume 24, Issue 20, Pages 8113-8130Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2gc02638d
Keywords
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Funding
- National Natural Science Foundation of China [51861007, 51661010, 81572113, 51361011]
- Open Fund of Material Corrosion and Protection Key Laboratory of Sichuan Province [2021CL28]
- Natural Science Foundation of Guangdong Province [2022A1515011339]
- Science and Technology Innovation Commission of Shenzhen [JCYJ20210324120009026, JCYJ20210324102013036]
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Using phytic acid sodium salt hydrate as a micro-arc oxidation electrolyte has been found to significantly improve coating characteristics and degradation resistance. The MAO-treated samples exhibited good cytocompatibility in vitro and during acute toxicity tests, suggesting the potential use of phytic acid sodium salt hydrate in future applications.
We used phytic acid sodium salt hydrate (Na(12)Phy) as a micro-arc oxidation (MAO) electrolyte and systemically investigated its influences on AZ31B coating characteristics and the MAO solution failure process. Na(12)Phy increased both phosphorus (P) and calcium (Ca) amounts as well as thickness, and adhesion strength of MAO coatings. MAO treatment, especially in a base solution with 4 g L-1 Na(12)Phy (Na(12)Phy-4C), significantly improved degradation resistance and in vitro cytocompatibility of AZ31B alloys. LC-MS/MS analysis showed that during MAO treatment, Na(12)Phy molecules were hydrolyzed from an anti-nutrient into absorbed inorganic phosphates by fish and a series of lower inositol phosphates with physiological activity. With increasing cycles of MAO treatment, the MAO sample achieved gradually decreased degradation resistance, but even after 50 cycles, it still had good cytocompatibility. Furthermore, 50% MAO waste solution was not toxic to Pengze crucian carp (Carassius auratus var. Pengze) during a 96 h acute toxicity test, suggesting that Na(12)Phy-containing MAO solution has potential for use in future applications.
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