Corrosion resistance and hydrophobicity of myristic acid modified Mg--Al LDH/Mg(OH) 2 steam coating on magnesium alloy AZ31

A hydrophobic surface was successfully fabricated on the Mg-Al-layered double hydroxide (Mg-Al LDH)/Mg(OH) 2-coated AZ31 magnesium alloy via an in-situ steam coating (SC) process and a subsequent surface modification with environment-friendly myristic acid (MA). The microstructure, composition and h...

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Published inFrontiers of materials science Vol. 14; no. 1; pp. 96 - 107
Main Authors QIU, Zai-Meng, ZHANG, Fen, CHU, Jun-Tong, LI, Yu-Chao, SONG, Liang
Format Journal Article
LanguageEnglish
Published Beijing Higher Education Press 01.03.2020
Springer Nature B.V
Subjects
Aluminum
Chemistry and Materials Science
Coating
Contact angle
Corrosion
Corrosion currents
Corrosion effects
Corrosion mechanisms
Corrosion prevention
Corrosion resistance
Corrosion resistant alloys
Hydrogen evolution
Hydrophobicity
Hydroxides
layered double hydroxide
magnesium alloy
Magnesium alloys
Magnesium base alloys
Materials Science
Microstructure
Research Article
steam coating
Substrates
steam coating
magnesium alloy
hydrophobicity
layered double hydroxide
corrosion resistance
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Summary:A hydrophobic surface was successfully fabricated on the Mg-Al-layered double hydroxide (Mg-Al LDH)/Mg(OH) 2-coated AZ31 magnesium alloy via an in-situ steam coating (SC) process and a subsequent surface modification with environment-friendly myristic acid (MA). The microstructure, composition and hydrophobicity of SC/MA composite coating were investigated by XRD, SEM, EDS, FTIR, and contact angle (CA) measurement. The corrosion behavior of the hybrid coating was evaluated by potentiodynamic polarization, EIS and hydrogen evolution test in 3.5 wt.% NaCl solution. The results showed that the LDH coating had nano-flake microstructure, which remained unchanged after modification with MA. The CA of the MA-modified coating surface reached up to 129°±3.5°, and the corrosion current density of SC/MA-2 coating decreased about three orders of the magnitude compared to that of the substrate. It is proven that the modified surface has an effective anti-corrosion effect on AZ31 alloy. The formation mechanism and the corrosion mechanism of the coating were also discussed.
Bibliography:steam coating
magnesium alloy
hydrophobicity
Document accepted on :2019-12-11
Document received on :2019-10-17
layered double hydroxide
corrosion resistance
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:2095-025X
2095-0268
DOI:10.1007/s11706-020-0492-x