Corrosion inhibition of pure Mg containing a high level of iron impurity in pH neutral NaCl solution

authors	Yang, JJ; Blawert, C; Lamaka, SV; Yasakau, KA; Wang, L; Laipple, D; Schieda, M; Di, SC; Zheludkevich, ML
nationality	International
journal	CORROSION SCIENCE
author keywords	Pure magnesium; Iron impurity; Iron re-deposition; Corrosion inhibitor
keywords	AZ91D MAGNESIUM ALLOY; CHLORIDE-CONTAINING ELECTROLYTE; ENHANCED CATALYTIC-ACTIVITY; PROBE FORCE MICROSCOPY; HYDROGEN EVOLUTION; LOCALIZED CORROSION; ANODIC POLARIZATION; RE-DEPOSITION; ACIDIC MEDIA; SCHIFF-BASE
abstract	Three sodium salts of organic acids (2,5-pyridinedicarboxylic, 3-methylsalicylic and fumaric) were studied as corrosion inhibitors for pure magnesium containing a high level (342 ppm) of Fe impurity. The inhibition effect of the three inhibitors was evaluated by means of hydrogen evolution, electrochemical and surface analysis techniques. Significant reduction in corrosion rate was revealed for of the tested inhibitors in pH neutral NaCl electrolyte. 2,5-pyridinedicarboxylate and fumarate showed the effects characteristic for mixed-type inhibitors, while 3-methylsalicylate performed more as cathodic inhibitor, complying with the iron re-deposition model, where the electrochemical activity of iron-rich particles was effectively inhibited.
publisher	PERGAMON-ELSEVIER SCIENCE LTD
issn	0010-938X
year published	2018
volume	142
beginning page	222
ending page	237
digital object identifier (doi)	10.1016/j.corsci.2018.07.027
web of science category	Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category	Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier	WOS:000444933400021