Investigation about Corrosion Properties of AZ31 Magnesium Alloy Coupled with Nitrided 40Cr Steel

2009 ◽  
Vol 79-82 ◽  
pp. 1515-1518
Author(s):  
Wei Lin Zhao ◽  
Zhen Lin Wang ◽  
Li Wen Tang ◽  
Jin Zhang
Keyword(s):  
Magnesium Alloy ◽  
Nitrided Layer ◽  
Immersion Test ◽  
Optical Microscope ◽  
Sem Analysis ◽  
Az31 Magnesium Alloy ◽  
Corrosion Properties ◽  
Conductive Properties ◽  
40Cr Steel ◽  
Electronic Microscope

Corrosion properties of magnesium alloys coupled with foreign metals impose much influence on the life of the parts. In this paper, the corrosion properties of AZ31 magnesium alloy coupled with nitrided 40Cr steel were investigated through immersion test in saline solution and weight loss test combining with optical microscope (OM) and scanning electronic microscope (SEM) analysis. The results indicate that the anticorrosion properties of the AZ31 magnesium alloy coupled with nitrided 40Cr steel are higher than those of the AZ31 magnesium alloy coupled with unnitrided 40Cr steel. The mechanism is attributed to the resultant nitrided layer which reduces the conductive properties.

Effect of Strain to the Microstructure and Texture of AZ31 Magnesium Alloy during Compression Deformation at Room Temperature

2014 ◽  
Vol 893 ◽  
pp. 387-391
Author(s):  
Shan Jiang ◽  
Bin Zeng ◽  
Lyes Douadji
Keyword(s):  
Magnesium Alloy ◽  
Room Temperature ◽  
Optical Microscope ◽  
Az31 Magnesium Alloy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Compression Direction ◽  
Different Strains ◽  
Strain Increase ◽  
Electronic Microscope

AZ31 magnesium alloy samples were compressed to different strains at room temperature and examined through the optical microscope, X-ray diffraction (XRD) and scanning electronic microscope. The results show that the produced twins were mainly the {102} type, and then the {101} type and {102}-{101} type. The size and amount of the twins increased with the strains growth, and after the saturation of twins in the grains the samples fractured. The compressed texture with the basal planes perpendicular to the compression direction also become stronger with strain increase. The {102} twinning deformation played an important role in changing the microstructure and properties of the magnesium alloy at room temperature.

INFLUENCE OF SURFACTANTS ON THE CORROSION PROPERTIES OF CHROMIUM-FREE ELECTROLESS NICKEL DEPOSIT ON MAGNESIUM ALLOY

2012 ◽  
Vol 19 (03) ◽  
pp. 1250025 ◽  
Author(s):  
JOTHI SUDAGAR ◽  
RUAN DEWEN ◽  
YAQIN LIANG ◽  
RASU ELANSEZHIAN ◽  
JIANSHE LIAN
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Electroless Nickel ◽  
Corrosion Current ◽  
Immersion Test ◽  
Electrochemical Polarization ◽  
Nickel Deposit ◽  
Corrosion Properties ◽  
Positive Direction ◽  
Polarization Test

Influence of surfactants on the corrosion properties of chromium-free electroless nickel deposit were investigated on AZ91D magnesium alloy. The corrosion tests were carried out by immersion test (1 M HCl) and electrochemical polarization test (3.5 wt% NaCl ). The surfactants in the electroless nickel bath increases the corrosion resistance properties of the deposit on the magnesium alloy. In addition, smoothness and amorphous plus nano-crystalline phase were increased and accounted for the significant corrosion resistance. As a consequence, the corrosion potential moved towards the positive direction and the corrosion current density decreased. The immersion tests also provided the same trend as that of electrochemical polarization test. On the whole, the study concluded that corrosion resistance was enhanced by including a surfactant in the electroless deposits on magnesium alloy.

Effect of Aluminum Coatings on Corrosion Properties of AZ31 Magnesium Alloy

2003 ◽  
Vol 419-422 ◽  
pp. 909-914 ◽  
Author(s):  
Liu Ho Chiu ◽  
Hsing An Lin ◽  
Chun Chin Chen ◽  
Chih Fu Yang ◽  
Chia Hua Chang ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Az31 Magnesium Alloy ◽  
Corrosion Properties ◽  
Aluminum Coatings

Effect of Ti Addition on Corrosion Properties of As-Cast and Hot-Rolled AM60 Magnesium Alloys

2017 ◽  
Vol 750 ◽  
pp. 113-117
Author(s):  
Yavuz Sun ◽  
Nazif Ugur Aydın ◽  
Yunus Turen ◽  
Hayrettin Ahlatci ◽  
Huseyin Zengin
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Immersion Test ◽  
Electrochemical Analysis ◽  
Electrochemical Test ◽  
Corrosion Properties ◽  
Homogenization Treatment ◽  
Corrosion Behaviors ◽  
Hot Rolled ◽  
Ti Addition

This study investigates the effect of Ti addition (0, 0.2, 0.5, 1wt%) on corrosion resistance of as-cast and hot rolled AM60 magnesium alloy. Corrosion behaviors were investigated by immersion tests and electrochemical analysis. The results showed that Ti addition altered the microstructure of as-cast AM60 magnesium alloy by decreasing the amount of β-Mg17Al12 eutectic phase. Homogenization treatment resulted in the dissolution of the most of the β-Mg17Al12 phases. Homogenized samples exhibited the lowest corrosion rate in immersion test while the best corrosion resistance was found for hot-rolled samples in electrochemical test. In hot-rolled state, Ti addition led to a slight change in the corrosion resistance of AM60 magnesium alloy.

Superplastic Behaviors of Casting AZ31 Magnesium Alloy

2007 ◽  
Vol 551-552 ◽  
pp. 237-240
Author(s):  
Hong Bo Li ◽  
J. Zhao ◽  
Jun Ting Luo ◽  
M. Hang
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Deformation Behavior ◽  
Superplastic Deformation ◽  
Optical Microscope ◽  
Az31 Magnesium Alloy ◽  
Uniaxial Tensile ◽  
Strain Rates ◽  
Tensile Experiment ◽  
Uniaxial Tensile Experiment

The superplasticity of magnesium alloy is important in industrial application. However the superplastic deformation of casting magnesium alloy is hard to be realized. In this paper, the stress–strain behaviors of casting AZ31 magnesium alloy with various strain rates at different deformation temperatures were investigated. The alloy was tested in the tensile condition with initial grain size of 25μm. It was found that the elongation of the alloy at 400°C with ε& = 4.25×10-4 s-1 is almost 200%. According to the results of uniaxial tensile experiment, the alloy exhibited superplastic deformation behavior with the slow stain rate in a temperature range of 350 to 450°C. The microstructures deformed and undeformed samples were observed with aid of optical microscope.

Effect of Gas Nitriding on CO2 Corrosion Behavior of 40Cr Steel

2011 ◽  
Vol 66-68 ◽  
pp. 956-959
Author(s):  
Bing Ying Wang ◽  
Zhen Tong Sun ◽  
S.N. Zhou
Keyword(s):  
High Pressure ◽  
Corrosion Behavior ◽  
Nitrided Layer ◽  
Optical Microscope ◽  
Nitriding Time ◽  
Gas Nitriding ◽  
Corrosion Scales ◽  
40Cr Steel ◽  
High Temperature High Pressure ◽  
Microhardness Tester

In this paper, 40Cr steel was gas-nitrided for varying time. The microstructure and microhardness of the nitrided layer were examined by means of optical microscope and microhardness tester. The CO2 corrosion behavior of 40Cr steel influenced by nitriding was studied using high temperature high pressure autoclave. The SEM, EDS and XRD technique were adopted to study the characteristics of CO2 corrosion scales on 40Cr steel. The results show that the pitting is generated for all the un-nitrided and nitrided specimens, however, the corrosion tendency and corrosion rate decreases with nitriding time increasing, mainly due to the compact of FeCO3 formed on the surface.

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