X-ray photoelectron spectroscopy investigations of zinc–magnesium alloy coated steel

2010 ◽  
Vol 124 (1) ◽  
pp. 472-476 ◽  
Author(s):  
Sheng Chen ◽  
Fei Yan ◽  
Fei Xue ◽  
Lihong Yang ◽  
Junliang Liu
Keyword(s):  
Magnesium Alloy ◽  
Photoelectron Spectroscopy ◽  
Coated Steel ◽  
X Ray

NANOMECHANICAL AND CORROSION PROPERTIES OF ZK60 MAGNESIUM ALLOY IMPROVED BY GD ION IMPLANTATION

2014 ◽  
Vol 21 (06) ◽  
pp. 1450085 ◽  
Author(s):  
XUE WEI TAO ◽  
ZHANG ZHONG WANG ◽  
XIAO BO ZHANG ◽  
ZHI XIN BA ◽  
YA MEI WANG
Keyword(s):  
Magnesium Alloy ◽  
Ion Implantation ◽  
Photoelectron Spectroscopy ◽  
Surface Hardness ◽  
Protective Layer ◽  
Hybrid Structure ◽  
Nacl Solution ◽  
Corrosion Properties ◽  
X Ray ◽  
Zk60 Magnesium Alloy

Gadolinium ( Gd ) ion implantation with doses from 2.5 × 1016 to 1 × 1017 ions/cm2 into ZK60 magnesium alloy was carried out to improve its surface properties. X-ray photoelectron spectroscopy (XPS), nanoindenter, electrochemical workstation and scanning electron microscope (SEM) were applied to analyze the chemical composition, nanomechanical properties and corrosion characteristics of the implanted layer. The results indicate that Gd ion implantation produces a hybrid-structure protective layer composed of MgO , Gd 2 O 3 and metallic Gd in ZK60 magnesium alloy. The surface hardness and modulus of the Gd implanted magnesium alloy are improved by about 300% and 100%, respectively with the dose of 1 × 1017 ions/cm2, while the slowest corrosion rate of the magnesium alloy in 3.5 wt.% NaCl solution is obtained with the dose of 5 × 1016 ions/cm2.

Monochromatized x-ray photoelectron spectroscopy of the AM60 magnesium alloy surface after treatments in fluoride-based Ti and Zr solutions

2005 ◽  
Vol 37 (5) ◽  
pp. 509-516 ◽  
Author(s):  
S. Verdier ◽  
S. Delalande ◽  
N. van der Laak ◽  
J. Metson ◽  
F. Dalard
Keyword(s):  
Magnesium Alloy ◽  
Photoelectron Spectroscopy ◽  
Alloy Surface ◽  
X Ray

scholarly journals Corrosion Resistance of MgZn Alloy Covered by Chitosan-Based Coatings

2021 ◽  
Vol 22 (15) ◽  
pp. 8301
Author(s):  
Iryna Kozina ◽  
Halina Krawiec ◽  
Maria Starowicz ◽  
Magdalena Kawalec
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Corrosion Rate ◽  
Photoelectron Spectroscopy ◽  
Multilayer Coating ◽  
Sem Analysis ◽  
Linear Sweep ◽  
High Corrosion Resistance ◽  
X Ray ◽  
Hank’S Solution

Chitosan coatings are deposited on the surface of Mg20Zn magnesium alloy by means of the spin coating technique. Their structure was investigated using Fourier Transform Infrared Spectroscopy (FTIR) an X-ray photoelectron spectroscopy (XPS). The surface morphology of the magnesium alloy substrate and chitosan coatings was determined using Scanning Electron Microscope (FE-SEM) analysis. Corrosion tests (linear sweep voltamperometry and chronoamperometry) were performed on uncoated and coated magnesium alloy in the Hank’s solution. In both cases, the hydrogen evolution method was used to calculate the corrosion rate after 7-days immersion in the Hank’s solution at 37 °C. It was found that the corrosion rate is 3.2 mm/year and 1.2 mm/year for uncoated and coated substrates, respectively. High corrosion resistance of Mg20Zn alloy covered by multilayer coating (CaP coating + chitosan water glass) is caused by formation of CaSiO3 and Ca3(PO4)2 compounds on its surface.

scholarly journals Corrosion Behavior and Mechanism of Carbon Ion-Implanted Magnesium Alloy

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 734
Author(s):  
Banglong Yu ◽  
Jun Dai ◽  
Qingdong Ruan ◽  
Zili Liu ◽  
Paul K. Chu
Keyword(s):  
Electron Microscopy ◽  
Magnesium Alloy ◽  
Ion Implantation ◽  
Electron Energy ◽  
Photoelectron Spectroscopy ◽  
Density Functional ◽  
Electronic Density ◽  
Carbon Ion ◽  
X Ray ◽  
Ion Implanted

Carbon ion implantation was conducted on an AM60 magnesium alloy with fluences between 1 × 1016 and 6 × 1016 ions/cm2 and an energy of 35 keV. The microstructure and electrochemical properties of the samples were systematically characterized by X-ray photoelectron spectroscopy, X-ray diffraction, Raman scattering, scanning electron microscopy, transmission electron microscopy, and electrochemical methods. These studies reveal that a 250 nm-thick C-rich layer is formed on the surface and the Mg2C3 phase embeds in the ion-implanted region. The crystal structure of the Mg2C3 was constructed, and an electronic density map was calculated by density-functional theory calculation. The large peak in the density of states (DOS) shows two atomic p orbitals for Mg2C3. The main electron energy is concentrated between −50 and −40 eV, and the electron energy mainly comes from Mg (p) and Mg (s). The electrochemical experiments reveal that the Ecorr is −1.35 V and Icorr is 20.1 μA/cm2 for the sample implanted with the optimal fluence of 6 × 1016 ions/cm2. The sample from C ion implantation gives rise to better corrosion resistance.

scholarly journals Effects of Ti, Ni, and Dual Ti/Ni Plasma Immersion Ion Implantation on the Corrosion and Wear Properties of Magnesium Alloy

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 313
Author(s):  
Jun Dai ◽  
Zheng Liu ◽  
Banglong Yu ◽  
Qingdong Ruan ◽  
Paul K. Chu
Keyword(s):  
Magnesium Alloy ◽  
Ion Implantation ◽  
Photoelectron Spectroscopy ◽  
Wear Test ◽  
Corrosion And Wear ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
X Ray ◽  
Bonding Properties ◽  
Plasma Immersion Ion Implantation

Ti, Ni, and Ti/Ni plasma immersion ion implantation is carried out on the AM60 magnesium alloy with a 6 × 1016 ions/cm2 fluence and energy of 35 keV. The corrosion and wear properties of the ion-implanted samples are determined systematically by X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy, electrochemical methods and wear tests. A Ni-rich layer composed of α-Mg, Ni2O3, and NiTi2 is formed on the surface after dual Ti/Ni ion implantation, and the ion implantation range is approximately 300 nm. The corrosion resistance of the Ni- and Ti/Ni-implanted AM60 samples is significantly reduced in the 3.5% NaCl solution. However, NiTi2 does not adhere well to the grinding ring during the wear test due to the bonding properties, and the sample implanted with both Ti and Ni shows the best wear resistance.

scholarly journals Study of the Corrosion Process of AZ91D Magnesium Alloy during the First Hours of Immersion in 3.5 wt.% NaCl Solution

2018 ◽  
Vol 2018 ◽  
pp. 1-20 ◽  
Author(s):  
Vanessa Mandarano Pinela ◽  
Leandro Antônio de Oliveira ◽  
Mara Cristina Lopes de Oliveira ◽  
Renato Altobelli Antunes
Keyword(s):  
Magnesium Alloy ◽  
Photoelectron Spectroscopy ◽  
Laser Scanning ◽  
Electrochemical Impedance ◽  
Corrosion Process ◽  
Laser Scanning Microscopy ◽  
Confocal Laser ◽  
Nacl Solution ◽  
X Ray ◽  
Az91d Magnesium Alloy

The AZ91D magnesium alloy was immersed in 3.5 wt.% NaCl solution at room temperature for times ranging from 1 minute up to 72 hours. The aim was to investigate the evolution of the corrosion process using confocal laser scanning microscopy (CLSM), electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy. The microstructure of the as-received alloy was initially characterized by optical microscopy and scanning electron microscopy (SEM). The crystalline phases were identified by X-ray diffractometry. The main phases were primary-α, eutectic-α, and β (Mg17Al12). Vickers microhardness markings were made on the surface of one etched sample to facilitate the identification of the same region at each different immersion time, thus enabling the observation of the corrosion process evolution. Corrosion initiates at the grain boundaries of the eutectic microconstituent and, then, propagates through primary α-grains. The β-phase was less severely attacked.

Preparation and characterization of a cerium conversion film on magnesium alloy

2015 ◽  
Vol 62 (4) ◽  
pp. 253-258 ◽  
Author(s):  
Jie Sun ◽  
Gang Wang
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Photoelectron Spectroscopy ◽  
Corrosion Current ◽  
Treatment Temperature ◽  
Conversion Coating ◽  
Conversion Coatings ◽  
Content Type ◽  
X Ray ◽  
Passivation Film

Purpose – The purpose of this paper was to prepare the cerium-based conversion coating on AZ91D magnesium alloy, and its compositions, micro-morphology, corrosion resistance and the chemical valence state of the film elements were investigated. Design/methodology/approach – The methodology comprised preparation of coatings at different temperatures, which then were characterized using scanning electron microscopy coupled with energy dispersive X-ray spectroscopy, an electrochemistry workstation and by means of X-ray photoelectron spectroscopy. Findings – The conversion coating had a micro-cracked morphology. The conversion coatings were composed of MgO (or Mg-OH), CeO2 and Ce2O3. The best corrosion resistance of the cerium passivation film appeared when the treatment temperature was about 35°C. Originality/value – The corrosion current densities of conversion coatings were lower by one to two orders of magnitude than the corrosion current density of the blank sample. The rare earth passivation coating prepared under the best condition could reduce the corrosion current to 3.548 × 10−6 A/cm2.

scholarly journals Sealing of PEO Coated AZ91 Magnesium Alloy Using La-Based Solutions

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Luca Pezzato ◽  
Katya Brunelli ◽  
Riccardo Babbolin ◽  
Paolo Dolcet ◽  
Manuele Dabalà
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Photoelectron Spectroscopy ◽  
Az91 Alloy ◽  
Az91 Magnesium Alloy ◽  
Corrosion Properties ◽  
X Ray ◽  
Different Temperatures ◽  
Az91 Magnesium ◽  
Sealing Treatment

In this work, solutions containing lanthanum salts were used for a post-treatment of sealing to increase the corrosion resistance of PEO coated AZ91 alloy. PEO coatings were produced on samples of AZ91 magnesium alloy using an alkaline solution containing sodium hydroxide, sodium phosphates, and sodium silicates. The sealing treatment was performed in a solution containing 12 g/L of La(NO3)3at pH 4 at different temperatures and for different treatment times. Potentiodynamic polarization test, an EIS test, showed that the sealing treatment with solution containing lanthanum nitrate caused a remarkable increase in the corrosion resistance. The corrosion behavior was correlated with the surface morphology and elemental composition evaluated with scanning electron microscope (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). In particular, the sealing treatment at 50°C for 30 min resulted in being the most promising to increase the corrosion properties of PEO treated samples because of the formation of a homogeneous sealing layer, mainly composed of La(OH)3.

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