Analysis of corrosion resistance of lightweight aluminum alloy sheet in the friction-stir joint area

2020 ◽  
Vol 10 (8) ◽  
pp. 1352-1357
Author(s):  
Ling Ji ◽  
Hongfeng Wang ◽  
Man Shi
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Heat Affected Zone ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
Alloy Sheet ◽  
The Self ◽  
Friction Stir ◽  
Grain Sizes ◽  
Joint Area

In this thesis, 1 mm thick 6061 aluminum alloy plates are connected using a friction stir joining device, and the metallographic structure and corrosion resistance of the friction stir joint area obtained with different process parameters are systematically analyzed. The results show that the core region of the joint is composed of small equiaxed crystals, and the grains in the heat-affected zone are elongated in the direction of stirring flow. The grain sizes of the heat-affected zone is different, and it is a coexistence zone of grains of various sizes. When the rotation speed of the stirring head is 15000 rpm and the forward speed of the stirring head is 300 mm/min, the self-corrosive potential of the connection area is optimized during electrochemical corrosion, and thus the self-corrosion current is the smallest. With this parameter, the joint area has the best corrosion resistance.

Wear Resistance Analysis of a Lightweight Aluminum Alloy Sheet Friction Stir Joint Area

2020 ◽  
Vol 52 (4) ◽  
pp. 565-572
Author(s):  
H. F. Wang ◽  
D. W. Zuo ◽  
S. R. Liu ◽  
J. F. Pu ◽  
W. W. Song
Keyword(s):  
Wear Resistance ◽  
Aluminum Alloy ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet ◽  
Friction Stir ◽  
Resistance Analysis ◽  
Joint Area

scholarly journals Evaluation of Structure and Corrosion Behavior of FeAl Alloy after Crystallization, Hot Extrusion and Hot Rolling

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2041
Author(s):  
Janusz Cebulski ◽  
Dorota Pasek ◽  
Bartosz Chmiela ◽  
Magdalena Popczyk ◽  
Andrzej Szymon Swinarew ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Hot Rolling ◽  
Cast Alloy ◽  
Rolling Direction ◽  
Extrusion Direction ◽  
Electrochemical Corrosion ◽  
Hot Extrusion ◽  
Corrosion Current ◽  
Plastic Working ◽  
Ingot Axis

The paper presents the results of tests on the corrosion resistance of Fe40Al5Cr0.2TiB alloy after casting, plastic working using extrusion and rolling methods. Examination of the microstructure of the Fe40Al5Cr0.2TiB alloy after casting and after plastic working was performed on an Olympus GX51 light microscope. The stereological relationships of the alloy microstructure in the state after crystallization and after plastic working were determined. The quantitative analysis of the structure was conducted after testing with the EBSD INCA HKL detector and the Nordlys II analysis system (Channel 5), which was equipped with the Hitachi S-3400N microscope. Structure tests and corrosion tests were performed on tests cut perpendicular to the ingot axis, extrusion direction, and rolling direction. As a result of the tests, it was found that the crystallized alloy has better corrosion resistance than plastically processed material. Plastic working increases the intensity of the electrochemical corrosion of the examined alloy. It was found that as-cast alloy is the most resistant to corrosion in a 5% NaCl compared with the alloys after hot extrusion and after hot rolling. The parameters in this study show the smallest value of the corrosion current density and corrosion rate as well as the more positive value of corrosion potential.

scholarly journals Microstructure and Corrosion Resistance to H2S in the Welded Joints of X80 Pipeline Steel

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1325 ◽  
Author(s):  
Jian-Bao Wang ◽  
Guang-Chun Xiao ◽  
Wei Zhao ◽  
Bing-Rong Zhang ◽  
Wei-Feng Rao
Keyword(s):  
Corrosion Resistance ◽  
Heat Affected Zone ◽  
Welded Joints ◽  
Electrochemical Impedance ◽  
Pipeline Steel ◽  
Electrochemical Corrosion ◽  
Open Circuit ◽  
Coarse Grained ◽  
Granular Bainite ◽  
X80 Pipeline Steel

The microstructure and corrosion resistance in H2S environments for various zones of X80 pipeline steel submerged arc welded joints were studied. The main microstructures in the base metal (BM), welded metal (WM), coarse-grained heat-affected zone (CGHAZ), and fine-grained heat-affected zone (FGHAZ) were mainly polygonal ferrite and granular bainite; acicular ferrite with fine grains; granular bainite, ferrite, and martensite/austenite constituents, respectively. The corrosion behavior differences resulted from the microstructure gradients. The results of the micro-morphologies of the corrosion product films and the electrochemical corrosion characteristics in H2S environments, including open circuit potential and electrochemical impedance spectroscopy, showed that the order of corrosion resistance was FGHAZ > BM > WM > CGHAZ.

scholarly journals Preparation of Ti–Zr-Based Conversion Coating on 5052 Aluminum Alloy, and Its Corrosion Resistance and Antifouling Performance

Coatings ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 397 ◽  
Author(s):  
Hehong Zhang ◽  
Xiaofeng Zhang ◽  
Xuhui Zhao ◽  
Yuming Tang ◽  
Yu Zuo
Keyword(s):  
Corrosion Resistance ◽  
Surface Modification ◽  
Aluminum Alloy ◽  
Current Density ◽  
Corrosion Current Density ◽  
Salt Water ◽  
Water Immersion ◽  
Chemical Conversion ◽  
Corrosion Current ◽  
Conversion Coating

A chemical conversion coating on 5052 aluminum alloy was prepared by using K2ZrF6 and K2TiF6 as the main salts, KMnO4 as the oxidant and NaF as the accelerant. The surface morphology, structure and composition were analyzed by SEM, EDS, FT–IR and XPS. The corrosion resistance of the conversion coating was studied by salt water immersion and polarization curve analysis. The influence of fluorosilane (FAS-17) surface modification on its antifouling property was also discussed. The results showed that the prepared conversion coating mainly consisted of AlF3·3H2O, Al2O3, MnO2 and TiO2, and exhibited good corrosion resistance. Its corrosion potential in 3.5 wt % NaCl solution was positively shifted about 590 mV and the corrosion current density was dropped from 1.10 to 0.48 μA cm−2. By sealing treatment in NiF2 solution, its corrosion resistance was further improved yielding a corrosion current density drop of 0.04 μA cm−2. By fluorosilane (FAS-17) surface modification, the conversion coating became hydrophobic due to low-surface-energy groups such as CF2 and CF3, and the contact angle reached 136.8°. Moreover, by FAS-17 modification, the corrosion resistance was enhanced significantly and its corrosion rate decreased by about 25 times.

Effect of Post-Weld Aging on The Corrosion Resistance and Mechanical Properties of Friction Stir Welded Aluminum Alloy 7475-T73

2013 ◽  
pp. 225-234
Author(s):  
Bharat K. Jasthi ◽  
Erik Klinckman ◽  
Todd Curtis ◽  
Christian Widener ◽  
Michael West ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Friction Stir

scholarly journals Low Temperature Sealing of Anodized Aluminum Alloy for Enhancing Corrosion Resistance

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4904
Author(s):  
Hyunbin Jo ◽  
Soomin Lee ◽  
Donghyun Kim ◽  
Junghoon Lee
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Current Density ◽  
Corrosion Current Density ◽  
Corrosion Current ◽  
Anodic Oxide ◽  
Nickel Acetate ◽  
Anodized Aluminum ◽  
Corrosive Media ◽  
Nickel Fluoride

Sealing as a post treatment of anodized aluminum is required to enhance the corrosion resistance by filling nanopores, which allow the penetration of corrosive media toward the base aluminum. We designed a mixed sealing solution with nickel acetate and ammonium fluoride by modifying traditional nickel fluoride cold sealing. The concentration of mixed sealing solution affected the reaction rate of sealing and corrosion current density of anodized aluminum alloy. The higher concentration of mixed sealing solution improved the sealing rate, which was represented by a decrease of corrosion current density of anodized aluminum alloy. However, a mixed sealing solution with 2/3 concentration of general nickel fluoride sealing solution operated at room temperature showed the lowest corrosion current density compared to traditional methods (e.g., nickel fluoride cold sealing (NFCS) and nickel acetate hot sealing) and other mixed sealing solutions. Moreover, the mixed sealing solution with 2/3 concentration of general NFCS had a lower risk for over sealing, which increases the corrosion current density by excessive dissolution of anodic oxide. Therefore, the mixed sealing solution with optimized conditions designed in this work possibly provides a new method for enhancing the corrosion resistance of anodized aluminum alloys.

Investigating the Effect of Friction Stir Welding on Microstructure and Corrosion Behaviour of Al-Zn-Mg Alloy

2019 ◽  
Vol 969 ◽  
pp. 517-523
Author(s):  
Chaitanya Sharma ◽  
Vikas Upadhyay
Keyword(s):  
Corrosion Resistance ◽  
Friction Stir Welding ◽  
Base Metal ◽  
Heat Affected Zone ◽  
Corrosion Behaviour ◽  
Metal Dissolution ◽  
Nugget Zone ◽  
Precipitate Morphology ◽  
Friction Stir ◽  
Secondary Precipitates

In this work, Friction Stir Welding (FSW) of alloy 7039 was carried out in T4 temper and resulting microstructure and corrosion behaviour of developed weld were studied. FSW transformed the starting microstructure of base metal and formed stirred zone (SZ) and heat affected zone (HAZ) with varying microstructure and precipitate morphology. The observed zones in welded joints exhibited decreased protection to corrosion resistance than base metal. Dissolution of secondary precipitates in SZ and occurrence of precipitate free zones (PFZs) in HAZ enhanced susceptibility to corrosion of HAZ and weld nugget zone (WNZ) than base metal.

Sign in / Sign up

Export Citation Format

Share Document