Bee Wax Propolis Extract as Zinc Corrosion Inhibitor in 3.5% NaOH

The potentiodynamic polarization method has investigated the corrosion behavior of zinc metal in 3.5% NaOH with a variation of bee wax popolis extract (BWPE) inhibitor, variation of immersion time, and temperature. Zinc plates were tested at 150 °C and 200 °C with immersion durations of 2, 4, and 6 hours, respectively. The variation of inhibitor concentration on corrosion rate has also been studied from 0, 200, 400, 600, 800, and 1000 ppm, followed by testing temperature variations of 25, 35, and 45°C for optimal inhibitor concentration. It is expected that this research will contribute to alternative organic corrosion inhibitors. Tafel polarization test results demonstrated that the corrosion rate of zinc metal in 3% NaOH increased with increasing test temperature and immersion time. Increasing the concentration of BWPE inhibitor from 200 ppm to 1000 ppm can reduce the corrosion rate of zinc metal from the sample without blank with optimal inhibition effectiveness obtained at a concentration of 800 ppm by 46.16%