A study was done to determine if the antioxidants found in peanut hulls could be used\rfor lessening the corrosion rate of iron. Peanut hulls were ground then divided into two\rbatches, P1 and P2, then oven-dried at temperatures of 50°C and 60°C, respectively. The\rmoisture content of each batch was then determined before performing methanolic extraction\rto isolate the antioxidants. Eighteen iron strips of approximately the same surface areas were\rthoroughly cleaned and weighed, then divided into six groups. The iron strips in the first five\rgroups were respectively coated with pure extract from batch P1; a 1:1 mixture of P1 extract\rand turpentine; pure P2 extract; a 1:1 mixture of P2 extract and turpentine; and pure\rturpentine. No treatment was done on the sixth group. All iron strips were exposed to air to\rallow formation of rust thru atmospheric corrosion. After 12 days, the iron strip were cleaned\rand weighed; then the individual corrosion rates of the metals were determined.\rThe corrosion rates of the metals treated with pure P1 extract, the P1-Turpentine, and\rthe P2-Turpentine mixtures were found to be significantly lower than the corrosion rates of\rthe metals without treatment, at 5% level of significance in a t-Test for independent samples.\rThe average corrosion rates of all the treated metals were found to be lower than that of\rmetals treated with pure turpentine, though not significantly. The corrosion rate of the metals\rcoated with turpentine was not significantly less than that of untreated metals. The corrosion\rrates of the metals were also found not to be dependent with the moisture as there was no\rsignificant difference in the mean corrosion rates of metals treated with P1 extract and those\rtreated with P2 extract, with or without turpentine.\rThe project has shown that peanut hull extracts can be used to lessen the production\rof rust on the surface of the metal. Moisture content of the hulls was not found to be a factor\rin lessening the corrosion rate.
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