Jeremy John G. Borlongan , John Bryan I. Chua , John Paul R. Teodosio (February 2006)
Philippine Science High School Western Visayas Campus – Department of Science and Technology (DOST-PSHS WVC), Brgy. Bito-on, Jaro, Iloilo City 5000, Philippines
ABSTRACT
This study was conducted to explore the possibility of producing a rust converter from tannin extracted from the Mahogany tree. Specifically, the study aimed to determine and compare the amount of tannin extracted from the different of tree in terms of the percent yield of remaining residue. It also aimed to determine and compare the performance of a produced rust converter, with the commercial one.
One-way analysis of variance showed that the percentage yield of tannin- containing residue extracted from both the leaves (4.52%) and bark (4.44%) are significantly higher that the percentage yield of tannin from the resulting residue extracted from the seeds (1.13%) (p-322.544; α= 0.05). Results of the Analysis of variance of the on the post “induced chemical rusting” test showed that there are no significant differences in the percent change of the mass of the iron bars. This suggests that there are no significant differences in the anti-rusting potentials of each of the treatment.
In terms of rust converting capability, the percent change of the mass of the iron bars treated with the commercial rust converter (1.81%) is significantly higher than the percent change of the mass of the iron bars treated with the produced rust converter (0.67%), the aqueous ethanol solution (0.32%) and water (0.31%) (p=71.850; a=0.05). The performance of the commercial rust converter was better than that of the other rust converters and water.