Corrosion inhibition of steel in 3.5% NaCl by rice straw extract
By Othman, N. K.; Yahya, S.; Ismail, M. C.
Published in Journal of Industrial and Engineering Chemistry
2019
Abstract
Inhibition of steel corrosion in 3.5% sodium chloride (NaCl) by rice straw extract (RSE) was studied via weight loss method up to 42days immersion. The corrosion inhibition efficiency (IE) showed a consistent value with the highest IE of 92% and low corrosion rate, 0.013mm/y. RSE was able to reduce pitting corrosion by presenting small hysteresis loop via cyclic polarization measurement. The formation of ferric-RSE layer due to complexation was confirmed via surface analysis. The presence of corrosion products on steel was significantly reduced by immersion in RSE. The inhibitory mechanism was proposed to be achieved through interphase inhibition.