Corrosion resistance of Mg-Al-LDH steam coating on AZ80 Mg alloy: Effects of citric acid pretreatment and intermetallic compounds
نویسندگان
چکیده
In this study, the effects of intermetallic compounds (Mg17Al12 and Al8Mn5) on Mg-Al layered double hydroxide (LDH) formation mechanism corrosion behavior an in-situ LDH/Mg(OH)2 steam coatings AZ80 Mg alloy were investigated. Citric acid (CA) was used to activate surface during pretreatment process. The first pretreated with CA then subjected a hydrothermal process using ultrapure water produce Mg-Al-LDH/Mg(OH)2 coating. effect different time activation microstructure elemental composition obtained analyzed FE-SEM, EDS, XRD FT-IR. resistance coated samples evaluated techniques, i.e., potentiodynamic polarization (PDP), electrochemical impedance spectrum (EIS) hydrogen evolution test. results indicated that significantly influenced activity by exposing compounds. area fraction Mg17Al12 Al8Mn5 phases higher after pretreatment, thus promoted growth subsequent Mg-Al-LDH coatings. for 30 s resulted in denser thicker LDH Increase led improvement alloy. current density lower three orders magnitude as compared uncoated
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ژورنال
عنوان ژورنال: Journal of Magnesium and Alloys
سال: 2022
ISSN: ['2213-9567']
DOI: https://doi.org/10.1016/j.jma.2022.01.004