Release rate kinetics of corrosion inhibitor loaded halloysite nanotube-based anticorrosion coatings on magnesium alloy AZ91D

The aim of this study is to investigate the kinetics of non-isothermal crystallization of polypropylene/high-density polyethylene/halloysite nanotube (PP/HDPE/HNT) nanocomposites using three methods, that is, Avrami equation, combined Ozawa–Avrami method (hereafter called Mo model), and Kissinger equation. The Avrami exponent ( n) is in the range of 1–2 for all the PP/HDPE/HNT nanocomposites indicating instantaneous nucleation while the crystallization rate constant ( Zt) values of PP/HDPE increased with the addition of HNT. This proved that addition of HNT increases the crystallization rate. The reduction of half crystallization time ( t 1/2) for PP/HDPE as the increasing HNT loading indicates faster crystallization rate. In the Mo model, the cooling rate chosen at unit crystallization time F( T) values for PP/HDPE decreases with the addition of HNT. Kissinger equation showed that the activation energy ( E a) of crystallization for the PP/HDPE decreases with the addition of HNT. All the results demonstrated that HNT can accelerate the crystallization rate for the PP/polyethylene blends.

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Microstructure and corrosion characteristics of laser-alloyed magnesium alloy AZ91D with Al–Si powder

Science and Technology of Advanced Materials ◽

10.1088/1468-6996/9/2/025002 ◽

2008 ◽

Vol 9 (2) ◽

pp. 025002 ◽

Cited By ~ 9

Author(s):

Ming Qian ◽

Da Li ◽

Chang Jin

Keyword(s):

Magnesium Alloy ◽

Alloy Az91d

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The Initial Steps of Atmospheric Corrosion on Magnesium Alloy AZ91D

Journal of The Electrochemical Society ◽

10.1149/1.2779957 ◽

2007 ◽

Vol 154 (11) ◽

pp. C684 ◽

Cited By ~ 51

Author(s):

Martin Jönsson ◽

Dan Persson ◽

Rolf Gubner

Keyword(s):

Magnesium Alloy ◽

Atmospheric Corrosion ◽

Alloy Az91d

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The Characteristic of Ceramic Coatings Prepared on Magnesium Alloy AZ91D by Micro-Arc Oxidization in Silicate Electrolyte

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.146-147.941 ◽

2010 ◽

Vol 146-147 ◽

pp. 941-947

Author(s):

Xi Chang Shi ◽

Xiang Xiao ◽

Bai Zhen Chen ◽

Wei Shang

Keyword(s):

Magnesium Alloy ◽

Outer Region ◽

Ceramic Coatings ◽

Nacl Solution ◽

Acacia Gum ◽

Alloy Az91d ◽

Micro Arc Oxidation ◽

Distribution Phase ◽

Magnesium Surface ◽

Better Than

A novel process of micro-arc oxidation (MAO) on AZ91D magnesium alloy is investigated in a Na2SiO3-NaOH-montmorillonite-EDTA-acacia gum electrolyte solution. The morphologies, elements distribution, phase components of the coatings are characterized by SEM, EDS and XRD. And CHI600 electrochemistry corrosion workstation is employed to investigate the property of corrosion resistance of the coatings. Furthermore, the anti-corrosion behavior is analyzed immersed in 3.5 wt. % NaCl solution. The results reveal that the ceramic coatings have the relatively dense and uniform in thickness and the silicon element tends to present primarily in the outer region of the coatings. The XRD results indicate that the oxide films are mainly composed of Mg2SiO4 and MgAl2O4 phases. The immersion results show that the corrosion resistances of the ceramic coatings on AZ91D magnesium surface are better than the magnesium substrate.

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