Exploration of natural polymers for use as green corrosion inhibitors for AZ31 magnesium alloy in saline environment.

Autor: Umoren SA; Center of Research Excellence in Corrosion, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia. Electronic address: umoren@kfupm.edu.sa., Solomon MM; Center of Research Excellence in Corrosion, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia., Madhankumar A; Center of Research Excellence in Corrosion, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia., Obot IB; Center of Research Excellence in Corrosion, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia.
Jazyk: angličtina
Zdroj: Carbohydrate polymers [Carbohydr Polym] 2020 Feb 15; Vol. 230, pp. 115466. Date of Electronic Publication: 2019 Dec 06.
DOI: 10.1016/j.carbpol.2019.115466
Abstrakt: Seven natural polymers namely, chitosan (CHI), dextran (Dex), carboxymethyl cellulose (CMC), sodium alginate (ALG), pectin (PEC), hydroxylethyl cellulose (HEC), and Gum Arabic (GA) were screened for anticorrosion property towards AZ31 Mg alloy in 3.5 wt.% NaCl solution. CHI, Dex, CMC, PEC, and GA accelerated the corrosion while ALG and HEC moderately inhibited the corrosion of the alloy. HEC and ALG (1 g/L) protected the alloy by 64.13 % and 58.27 %, respectively. Two inhibitor cocktails consisting of either HEC or ALG, KI, and Date palm seed oil have been formulated. HEC- and ALG-formulations inhibited the alloy corrosion by 80.56 % and 77.43 %, respectively from EIS technique. Surface observation studies using SECM, AFM, SEM, and EDX agreed with other experimental results revealing effective corrosion inhibition by the formulations. X-ray photoelectron spectroscopy, FTIR, and UV-vis results disclose that Mg(OH) 2 co-existed with adsorbed inhibitor complexes.
(Copyright © 2019 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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