Corrosion resistance and adhesion strength of a spin-assisted layer-by-layer assembled coating on AZ31 magnesium alloy

Rapidly removing the water molecules significantly increased the molar concentration of the polyelectrolytes due to the air shear force and the centrifugal force during the spinning procedure. It enhanced the corrosion resistance and adhesion strength of magnesium alloys. [Display omitted] •A defect...

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Bibliographic Details
Published in:Applied surface science 2018-03, Vol.434, p.787-795
Main Authors: Zhao, Yan-Bin, Liu, Han-Peng, Li, Chang-Yang, Chen, Yong, Li, Shuo-Qi, Zeng, Rong-Chang, Wang, Zhen-Lin
Format: Article
Language:English
Subjects:
Adhesion strength
Corrosion resistance
Hydrogen bond
Layer-by-layer
Magnesium alloy
Spin-casting
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Summary:Rapidly removing the water molecules significantly increased the molar concentration of the polyelectrolytes due to the air shear force and the centrifugal force during the spinning procedure. It enhanced the corrosion resistance and adhesion strength of magnesium alloys. [Display omitted] •A defect-free, dense and uniform coating was prepared by the spin-casting technique.•The spin-casting film had stronger hydrogen bonds than the dip-coating film.•Spin-casting sample possessed excellent corrosion resistance and adhesion strength.•Spin-casting method could well promote the formation of hydroxyapatite in HBSS. A polyvinylpyrrolidone (PVP)/polyacrylic acid (PAA) layer-by-layer (LbL) assembled composite coating with a multilayer structure for the corrosion protection of AZ31 magnesium alloy was prepared by a novel spin-casting method. The microstructure and composition of this coating were investigated by means of SEM, XRD and FT-IR measurements. Moreover, electrochemical, immersion and scratch tests in vitro were performed to measure the corrosion performance and the adhesion strength. These results indicated that the (PVP/PAA)10 composite coating with defect-free, dense and uniform morphologies could be successfully deposited on the surface of magnesium alloy. The coating had excellent corrosion resistance and adhesion strength.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2017.11.012