Determining efficiency of inhibition of johar flower ethanol extract (Cassia siamea Lamk.) in the corrosion reaction of A36

Abstract

The investigation about determining the efficiency of inhibition of johar flower ethanol extract in the corrosion reaction of A36 steel (ASTM)/SS400 (JIS) in 3% NaCl solution has been done. This research aims to determine the immersion time and concentration of johar flower ethanol extract in inhibiting the rate of corrosion on steel plates with the highest value of inhibition efficiency. Making the inhibitor is done by extracting the johar flowers using the maceration method. The extract was mixed into the 3% NaCl corroding media with variations in concentrations of 0, 1000; 2000; 3000 and 4000 ppm, then immersed steel plate samples with a size of 50 × 20 × 3 mm for the variation of immersion time 5; 10; 15 and 20 days. Corrosion testing is carried out using the weight loss method. The test results showed that secondary metabolite compounds in johar flower ethanol extract could function as a corrosion inhibitor by inhibiting the rate of corrosion on the steel plate. The inhibition efficiency for johar flower ethanol extract was found in the concentration of 3000 ppm with immersion time for 15 days, amounting to 33.49%.

The Effect of Johar Plant Flower Extract “Cassia Siamea” on the Degree of Plasmodium Berghei Parasitemia in Vivo

“…17 This is in line with research conducted by Mamadou Kamagate and his friends in 2014 at the University of Felix Houphouet Boigny-Abidjan where they researched to prove that the compounds contained in johar plant extracts consisting of leaves, stems, flowers, and roots can be used as antimalarials. 14 Specific research regarding the effect of johar flower extract on the degree of parasitemia of mice infected with Plasmodium berghei has not been carried out in Indonesia. However, there has been research discussing the effectiveness of johar leaves as an antimalarial, such as research conducted by Wiwied Ekasari and friends in 2003 where they made an extract.…”

“…The resulting filtrate was separated using a rotary vacuum evaporator under a reduced pressure of 520 C to obtain a thick johar flower extract. 1 gram of thick johar flower extract was weighed and dissolved in 100 ml of ethanol and a solution of johar flower extract was obtained with a concentration of 10,000 ppm or the equivalent of 10,000 mg. 14…”