Exfoliation corrosion of aluminum alloy AA7075 examined by electrochemical impedance spectroscopy

2004 ◽  
Vol 55 (1) ◽  
pp. 18-23 ◽  
Author(s):  
F.-H. Cao ◽  
Z. Zhang ◽  
J.-F. Li ◽  
Y.-L. Cheng ◽  
J.-Q. Zhang ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Exfoliation Corrosion

Exfoliation Corrosion Behavior of 2524 Aluminum Alloy

2007 ◽  
Vol 546-549 ◽  
pp. 1159-1162 ◽  
Author(s):  
Sheng Yang ◽  
Dan Qing Yi ◽  
Su Juan Yao ◽  
Ya Ping Hou
Keyword(s):  
Aluminum Alloy ◽  
Electron Microscope ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Hydrogen Evolution ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Exfoliation Corrosion ◽  
Corrosion Kinetics ◽  
Transmission Electron

The exfoliation corrosion behavior of 2524 aluminum alloy was studied by Transmission Electron Microscope (TEM), hydrogen evolution and Electrochemical impedance spectroscopy (EIS) . The results showed that 2524 aluminum alloy was very susceptible to exfoliation corrosion and the exfoliation corrosion appeared after 24 h. EIS could better explain the exfoliation corrosion than hydrogen evolution. Exfoliation corrosion kinetics included accelerated formation of pitting, quick development of pitting, retarded formation of exfoliation and steady development of exfoliation.

EIS Research of AW-7020 Alloy Joints Welded by FSW

2013 ◽  
Vol 199 ◽  
pp. 412-417 ◽  
Author(s):  
Krzysztof Dudzik ◽  
Adam Charchalis
Keyword(s):  
Aluminum Alloy ◽  
Electrochemical Impedance Spectroscopy ◽  
Friction Stir Welding ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
New Technology ◽  
Electrochemical Corrosion ◽  
Signal Amplitude ◽  
Corrosion Properties ◽  
Friction Stir

The results of corrosion properties research of aluminum alloy AW 7020 (AlZn5Mg1) welded by friction stir welding FSW were presented. Friction Stir Welding (FSW) a new technology can be successfully used for butt welding of different types of aluminum alloy sheets. In the article the parameters for friction stir welding of sheets made of AlZn5Mg1 (7020) alloy was presented. The study was carried out in accordance with the requirements of the ASTM G 106. EIS measurement was performed in three electrode system in an artificial seawater (3.5% NaCl). Impedance studies were carried out at the corrosion potential. Changed voltage signal amplitude in the range ± 10 mV and frequency range of changes was as follows: 100 kHz - 0.1 Hz. Atlas 0531 EU & IA potentiostat was used for studies. The results of electrochemical impedance spectroscopy are presented in the form of parameters characterizing the corrosion process. Obtained results were statistically analyzed. The electrochemical impedance spectroscopy studies have shown that the joint welded by FSW has better electrochemical corrosion resistance than the native material - AW-7020 alloy. Original value are received results of the corrosion properties of new method friction stir welded AlZn5Mg1 alloy compared with the native material.

Influence of Joining Method on Electrochemical Corrosion Properties of 7020 Aluminum Alloy Joints

2015 ◽  
Vol 220-221 ◽  
pp. 589-594
Author(s):  
Krzysztof Dudzik
Keyword(s):  
Aluminum Alloy ◽  
Electrochemical Impedance Spectroscopy ◽  
Friction Stir Welding ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Signal Amplitude ◽  
Metallographic Analysis ◽  
Corrosion Properties ◽  
Friction Stir

The results of corrosion properties research of aluminum alloy AW 7020 (AlZn5Mg1) welded by friction stir welding (FSW) and MIG were presented. Friction Stir Welding (FSW) – a new technology can be successfully used for butt welding of different types of aluminum alloy sheets. In the paper, the parameters for friction stir welding of sheets made of AlZn5Mg1 [7020] alloy were presented as well as parameters for MIG. Metallographic analysis of bonds showed a proper structural construction of both, the FSW and MIG welded 7020 aluminum alloys.The study was carried out in accordance with the requirements of the ASTM G 106. EIS measurement was performed in three-electrode system in artificial seawater (3.5% NaCl). Impedance studies were carried out at the corrosion potential. Changed voltage signal amplitude in the range ±10 mV and frequency range of changes was as follows: 100 kHz – 0.1 Hz. Atlas 0531 EU & IA potentiostat was used for studies.The results of electrochemical impedance spectroscopy are presented in the form of parameters characterizing the corrosion process. Obtained results were statistically analyzed.The electrochemical impedance spectroscopy studies have shown that the joint welded by FSW has better electrochemical corrosion resistance than the joint welded by MIG and the native material – AW-7020 alloy.Original value are received results of the corrosion properties of new method friction stir welded AlZn5Mg1 alloy compared with traditional MIG method and the native material.

Development of Coating to Metallic Surfaces with Capacitive Capabilities for Applications in Electronics

2016 ◽  
Vol 869 ◽  
pp. 680-684
Author(s):  
Ana Paula Jardim Roquete ◽  
Valeska Rodrigues Roque ◽  
Laura Martins Fonseca ◽  
Lorena Aparecida Nunes Viana ◽  
Angélica Karine Henkes ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Immersion Time ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Metallic Surfaces ◽  
Capacitive Properties

The capacitive properties on aluminum alloy coated by sol-gel are evaluated in this work. The samples were anodized in a H2SO4 solution for three different times (15, 20 and 30 min) and subsequently covered by a sol-gel. The capacitance of the samples was evaluated by electrochemical impedance spectroscopy (EIS). Firstly the capacitance of the anodizing samples was evaluated. The second condition was the evaluation of the anodized samples coated by sol-gel. The better capacitance results obtained in the first condition was observed in the blank samples and by the 15 min anodized samples. After the sol-gel deposition, the influence of coating on the overall capacitance was observed. Their stability during the immersion time of the evaluation was observed as well.

scholarly journals Study of coloured anodized coatings on aluminum alloy by electrochemical impedance spectroscopy

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 197-204
Author(s):  
K. I. Oskin ◽  
◽  
N. M. Yakovleva ◽  
E. A. Chupakhina ◽  
K. V. Stepanova ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Circuit Simulation ◽  
Electrical Circuit ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Equivalent Electrical Circuit ◽  
Hydrothermal Sealing

Anodizing, porous anodic alumina, electrochemical impedance spectroscopy, electrolytic coloring, hydrothermal sealing, equivalent electrical circuit, simulation.

Sign in / Sign up

Export Citation Format

Share Document