Research on Salt Fog Corrosion Behavior of Welded Joint of 7N01-T4 Aluminum Alloy for High-Speed Train

2011 ◽  
Vol 239-242 ◽  
pp. 2822-2826 ◽  
Author(s):  
Xiao Min Wang ◽  
Jun Jing Zhao ◽  
Guo Qing Gou
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
High Speed ◽  
Welded Joint ◽  
High Speed Train ◽  
Welding Seam ◽  
Corrosion Zone ◽  
Micro Morphology ◽  
Salt Fog Corrosion ◽  
Salt Fog

Salt fog corrosion test was employed to observe the corrosion behavior of welded joint of 7N01-T4 aluminum alloy of high-speed train. Tensile strength and hardness change after corrosion were tested and micro morphology was observed by metalloscope and LCSM. The results indicated that HAZ was the most sensitive corrosion zone in welded joint of 7N01-T4 in chlorinated moisture environment. Influenced by the heat-input of welding, the grains of HAZ were coarsening and inhomogeneous. A corrosion cell between welding seam with high Mg content and HAZ with high Zn content formed. HAZ corroded preferentially as anode, and the dissolving of zinc-rich phase in grain boundary resulted in the extending of corrosion crack along grain boundaries.

Salt fog corrosion behavior of friction stir welded AA2014-T651 aluminum alloy

2016 ◽  
Vol 58 (11-12) ◽  
pp. 932-938 ◽  
Author(s):  
Kollapuri Thamilarasan ◽  
Sadayan Rajendraboopathy ◽  
Gankidi Madhusudhan Reddy ◽  
Tadivaka Srinivasa Rao ◽  
Sajja Rama ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Friction Stir ◽  
Salt Fog Corrosion ◽  
Salt Fog

Studies on salt fog corrosion behavior of friction stir welded AA7075–T651 aluminum alloy

2014 ◽  
Vol 105 (4) ◽  
pp. 375-385 ◽  
Author(s):  
T. Srinivasa Rao ◽  
G. Madhusudhan Reddy ◽  
G. Srinivasa Rao ◽  
S. R. Koteswara Rao
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Friction Stir ◽  
Salt Fog Corrosion ◽  
Salt Fog

Salt fog corrosion behavior in a powder-processed icosahedral-phase-strengthened aluminum alloy

2017 ◽  
Vol 121 ◽  
pp. 133-138 ◽  
Author(s):  
T.J. Watson ◽  
M.A. Gordillo ◽  
A.T. Ernst ◽  
B.A. Bedard ◽  
M. Aindow
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Icosahedral Phase ◽  
Salt Fog Corrosion ◽  
Salt Fog

Research on corrosion behavior of A6N01S-T5 aluminum alloy welded joint for high-speed trains

2012 ◽  
Vol 26 (5) ◽  
pp. 1471-1476 ◽  
Author(s):  
Guoqing Gou ◽  
Nan Huang ◽  
Hui Chen ◽  
Hongmei Liu ◽  
Aiqin Tian ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
High Speed ◽  
Welded Joint ◽  
High Speed Trains

scholarly journals Microstructure, Mechanical Properties and Corrosion Behavior of the Aluminum Alloy Components Repaired by Cold Spray with Al-Based Powders

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1633
Author(s):  
Zhiyi Zhang ◽  
Xiaoguang Sun ◽  
Shiming Huang ◽  
Xiaohui Han ◽  
Ping Zhu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Cold Spray ◽  
Corrosion Behavior ◽  
High Speed ◽  
Neutral Salt ◽  
Cold Spray Process ◽  
Spray Process ◽  
High Speed Trains ◽  
Mechanical Properties And Corrosion

Aluminum alloy components of high-speed trains have a great risk of being corroded by various corrosive medium due to extremely complex atmospheric environments. This will bring out huge losses and reduce the safety and stability of trains. In order to solve the problem, cold spray process was used for repairing the damage of the aluminum alloy components with Al-based powders. Microstructure, mechanical properties and corrosion behavior were studied. The results indicated that there were very few pores and cracks in the repaired areas after repairing. The average microhardness of the repaired areas was 54.5 HV ± 3.4 HV, and the tensile strength of the repaired samples was 160.4 MPa. After neutral salt spray tests for 1000 h, the rate of mass loss of the samples repaired by cold spray was lower than that of 6A01 aluminum alloy. The electrochemical test results showed that the repaired areas had a higher open circuit potential than 6A01 aluminum alloy. As a result, the repaired areas such as the anode protected its nearby substrate. The samples repaired by cold spray exhibited better corrosion than 6A01 aluminum alloy. Cold spray process and Al-based powders are applicable for repairing the aluminum alloy components of high-speed trains.

Research on the Influence of Salt Fog Corrosion Behavior of 6005A Aluminum Alloy Welded Joints by Environment Humidity

2013 ◽  
Vol 662 ◽  
pp. 251-257
Author(s):  
Ning Xia ◽  
Zhi Min Zhu ◽  
Hui Chen
Keyword(s):  
Weight Loss ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Relative Humidity ◽  
Corrosion Rate ◽  
Environmental Humidity ◽  
Welding Joints ◽  
Salt Fog Corrosion ◽  
Salt Fog

6005A aluminum alloys were welded at different relative humidity conditions. The effects of relative humidity on the salt fog corrosion of the welding joints were researched. The results showed that the weight loss of the joints after 14 days corrosion was higher than that corroded after 7days, but the corrosion rate was lower. The corrosion rate first increased then declined with the increase of environmental humidity for the joints corroded for 7days. However, when the environmental humidity was 80%, corrosion rate achieved the maximum, when environment humidity was 70%, corrosion rate was the lowest. After corroded for 14 days, corrosion rate was the maximum when the environmental humidity was 50%, and it was the lowest when the environmental humidity was 90%. The tensile strength declined obviously after corrosion.

Failure Analysis of a Welded Aluminum Alloy Component in High-Speed Train

2011 ◽  
Vol 337 ◽  
pp. 670-673
Author(s):  
Yong Hui Zhu ◽  
Wei Zhou ◽  
Yuan Nie ◽  
Zhong Yin Zhu ◽  
Hui Chen ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Stress Concentration ◽  
Failure Analysis ◽  
High Speed ◽  
Propagation Speed ◽  
Element Distribution ◽  
High Speed Train ◽  
Alloy Component ◽  
Stress Concentration Region ◽  
Weld Toe

In this paper, a failure analysis is made to a welded aluminum alloy component of the equipment by module below the high-speed train. Making force analysis to the welded components by finite element, microscopic morphology observation and element distribution measurement of the fracture surface are done by the scanning electron microscopy and spectroscopy .It is determined that the main reason of fracture of welded components was that stress concentration exist in the working conditions, and the weld toe is the most severe stress concentration region. The stress concentration causes the fatigue microcrack, and under the action of repeated external force crack propagates and then crack. Lacking of penetration sites is under tensile residual stress, the crack propagation speed, and soon to instability and then broken.

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