Ability to Use of Robinia Pseudoacania L Fruit Extract as a Natural Corrosion Inhibitor in the Protection of Historical Bronze Objects (original) (raw)

2020, Research Square (Research Square)

Background: The phenomenon of bronze disease is considered as the most important factor in the destruction of bronze objects. Different methods have been proposed to cope with it. The most important inhibitors used in this regard are BTA and AMT. While these inhibitors control the corrosion, they are toxic and cancerous. In the ideal conditions, these inhibitors are able to slow down the activity of chlorine ion, but they leave some side effects after a period of treatment. Today, plant extracts are used for this purpose. In this study, Robinia pseudoacania L extract was selected for this purpose. Material and methods: Natural inhibitor of Robinia fruit at concentrations of 200 ppm to 1800 ppm was evaluated in a corrosive solution of sodium chloride 0.5 M on a bronze alloy with a percentage similar to ancient alloys (Cu-10Sn) using potentiostat, weight loss method, and humidi er area. Results: Given the data derived from potentiostate device showed that Robinia pseudoacania L Inhibitory power at 1000 ppm with corrosion rate of 12.78% is 55% and the classic method of weight loss inhibitory power after four week at 1800 ppm Robinia pseudoacania L in contrast a corrosive solution of sodium chloride 0.5 M is 92% for bronze alloy (Cu-10Sn). In addition, SEM images suggest that the formation of lm on the coupon has been acked. Conclusion: While the results of the analyses suggest the inhibitory power of Robinia pseudoacania L, granular corrosion is evident on the coupons surfaces in SEM-EDX images and analysis.

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