Effect of preservative sodium benzoate on the stability of bilimbi fruit (averrhoa bilimbi l.) leaf extract and corrosion rate of stainless steel wire
Keywords:
Bilimbi leaf extract, corrosion inhibitor, corrosion rate, extract stability, sodium benzoateAbstract
Introduction: Tannin in bilimbi leaves is a natural corrosion inhibitor for orthodontic wires. The research investigated the stability of bilimbi leaf extract when combined with sodium benzoate. Objective: This study aimed to evaluate the effect of sodium benzoate on the stability of bilimbi leaf extract and the corrosion rate of stainless steel orthodontic
wires throughout 0, 21, and 42 days. Methods: Thirty-two samples of 0.7 mm diameter stainless steel wire were divided into control (K) and treatment groups (P). Initial weight measurements were obtained using an analytical balance, followed by daily immersion in bilimbi leaf extract with or without preservatives for 9 minutes and 36 seconds
each day for 42 days. The stability of the extract was assessed using spectrophotometry, and the corrosion rate on days 0, 21, and 42 was analyzed using Two-way ANOVA with a confidence level of 95%, followed by Post hoc LSD. Results: Significant differences were observed in all test groups (p<0.05). The P0 group exhibited the highest extract
stability, followed by K0, P21, K21, P42, and K42. The lowest corrosion rate was observed in the K0 and P0 groups, followed by P21, K21, P42, and K42. Conclusion: Sodium benzoate effectively delays the decline in the stability of bilimbi leaf extract and enhances the corrosion rate of stainless steel orthodontic wires on days 0, 21, and 42.
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