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Jiang Q.,Nanjing University of Aeronautics and Astronautics | Miao Q.,Nanjing University of Aeronautics and Astronautics | Ding X.,Nanjing IVECO Automobile Co. | Wei X.,Jiangsu Linlong New Materials Co.
Journal of the Chinese Society of Corrosion and Protection | Year: 2013

The behavior of hydrogen evolution was determined by gas volumetric measurement over a period of 72 h at 45 °C. The inhibiting effectiveness of ten kinds of corrosion inhibitors on Al-Zn-Si alloy powders in a solution of water with 10 mass% C6Hi402 was compared. The investigations of Al-Zn-Si samples were carried out by use of IR, SEM and XRD. It has been shown that the hydrogen evolution of flake Al-Zn-Si powder can be inhibited by the addition of TBAB and HEDP with an optimal concentration of TBAB/Al-Zn-Si=50(mass%) and HEDP/ Al-Zn-Si=100(mass%) in 2-butoxyothanol aqueous solutions the inhibition efficiency can reach 78.99% and 62.77%, respectively. At last, Pourbaix diagram was used to analyse the microgalvanic corrosion of Al-Zn-Si alloy powder in aqueous media, and the inhibition mechanism of the inhibitors TBAB was discussed briefly. Source


Jiang Q.,Nanjing University of Aeronautics and Astronautics | Miao Q.,Nanjing University of Aeronautics and Astronautics | Liang W.-P.,Nanjing University of Aeronautics and Astronautics | Ying F.,Jiangsu Linlong New Materials Co. | And 5 more authors.
Electrochimica Acta | Year: 2014

Al-Zn-Si-RE coating was deposited on mild steel by arc spraying Al-Zn based alloy wire with a high Al content. The corrosion behavior of Al-Zn-Si-RE coating was investigated by corrosion morphologies and electrochemical measurements. The results indicated that Al-Zn-Si-RE coating exhibited homogeneous distributions of elements and a dense homogeneous lamellar microstructure with good scale adhesion. The phases of the coatings are Zn-rich phase, Al-rich phase, Al0.403Zn0.597 and Al9Si phase. Corrosion products had been deposited in the defects, which caused self-sealing behavior and hindered further corrosion. Corrosion products formed on Al-Zn-Si-RE coating surface consisted mainly of simonkolleite [Zn 5(OH)8Cl2·H2O], zinc aluminum hydrotalcites [Zn0.71Al0.29(OH)2(CO 3)0.145·xH2O, Zn0.70Al 0.30(OH)2(CO3)0.15·xH 2O, Zn6Al2(OH)16CO 3·4H2O] and aluminum chloride hydroxide hydrate [Al5Cl3(OH)12·4H2O]. Corrosion products had been deposited in the defects, which caused self-sealing behavior and hindered further corrosion. Furthermore, sacrificial anodic protection played a dominant role during the corrosion process. There were different corrosion stages of the coating in sodium chloride solution, such as pitting-dissolution-redeposition, active dissolution, cathodic protection and physical barriers caused by corrosion products. Finally, schematic model of the protective mechanisms of Al-Zn-Si-RE coating during immersion in sodium chloride solution was given. © 2013 Published by Elsevier Ltd. Source


Jiang Q.,Yancheng Institute of Technology | Jiang Q.,Nanjing University of Aeronautics and Astronautics | Miao Q.,Nanjing University of Aeronautics and Astronautics | Liang W.,Nanjing University of Aeronautics and Astronautics | And 4 more authors.
Journal of the Chinese Society of Corrosion and Protection | Year: 2015

The microstructure and corrosion performance in 3.5% NaCl solution of an Al-Zn-Si-RE containing water-borne coating were investigated by means of SEM with EDS as well as potentiodynamic polarization curves and electrochemical impedance spectroscopy techniques (EIS). The results indicate that Al-Zn-Si-RE coating shows a typical lamellar structure, which significantly increases the length of diffusion path for corrosive species; and an excellent coating uniformity in micro scale, which may be beneficial to its protectiveness. The corrosion process of Al-Zn-Si-RE coating can be divided into four stages during immersion in 3.5%NaCl solution: I) the active corrosion of Al-Zn-Si-RE flakes on the surface layer; II) the coverage of Al-Zn-Si-RE flakes by the corrosion product layer thereby decreasing their dissolution; III) the temporary sacrificial anode protection of the coating for the steel substrate when the electrolyte reached the interface coating/substrate; IV) the barrier protection caused by corrosion products. Therefore, the protection mechanism of the coating is physical barrier combined with a weak sacrificial anode protection. © 2015, Chinese Society of Corrosion and Protection. All rights reserved. Source


Zhou W.-B.,Nanjing University of Aeronautics and Astronautics | Yao Z.-J.,Nanjing University of Aeronautics and Astronautics | Wei D.-B.,Nanjing University of Aeronautics and Astronautics | Jiang Q.,Nanjing University of Aeronautics and Astronautics | And 3 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2013

The influence of hot isostatic pressing (HIP) on the corrosion resistance of arc spraying Zn-Al-Si alloy coating was studied by electrochemical test, salt solution (3.5%NaCl, mass fraction) immersion test, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results indicate that when the alloy is HIP-processed at 150 MPa and 300°C for 1 h, the corrosion current of arc spraying Zn-Al-Si coating is greatly reduced, the passivation phenomenon is promoted, and the corrosion resistance and protective life are improved. HIP treatment flats the surface, improves the element distribution, greatly eliminates the pore structure. The porosity is decreased by 87.15%, occluded cell corrosion and pore extension are avoided. Uniform element distribution, flat surface structure and dense internal tissue are the main reasons to cause the reduction of corrosion current and passivation phenomenon. Source


Patent
Jiangsu Linlong New Materials Co. | Date: 2010-03-31

The invention relates to a special hot-dip plating alloy for a coating on the surface of a titanium alloy part, wherein the hot-dip plating alloy contains the following components by mass percentage: 8-24% of Si, 1.2-3.1% of Zn, 0.02-0.5% of RE, 0.5-3.2% of Mg, 0.05-1% of Fe, 0.05-0.5% of Cu, 1.0-2.0% of Mn, 0.5-2.0% of Cr, 0.02-0.5% of Zr, 1-2% of nano-oxide particle reinforcing agent and the balance of Al and inevitable impurities, and the nano-oxide particle reinforcing agent is selected from one or two of TiO

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