scholarly journals Active Corrosion Protection by Epoxy Coating on Li2CO3-Pretreated Anodized Aluminum Alloy 2024-T3

2022 ◽  
Vol 8 ◽  
Author(s):  
Badar Minhas ◽  
Sahib Dino ◽  
Luyao Huang ◽  
Dequan Wu
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Protective Coatings ◽  
Protective Layer ◽  
Lithium Carbonate ◽  
Epoxy Coating ◽  
Anodized Aluminum ◽  
Lateral Direction ◽  
Tof Sims ◽  
Aluminum Alloy 2024

The fast leaching and robust barrier property of inhibitors are the basic fundamentals for the formation of active protective coatings to protect aluminum alloys. Herein, an active protective surface was developed based on an epoxy coating and an underlying lithium carbonate (Li2CO3)-treated anodized aluminum alloy 2024-T3. The morphology of the Li-LDH layer was studied to know its formation mechanism. The electrochemical studies revealed that the fast and adequate leaching of lithium led to a substantial increment of corrosion resistance of the scratched coating in 3.5 wt% NaCl from 1 to 8 days. Time of flight secondary ion mass spectroscopy (ToF-SIMS) results indicated that Li was distributed in the lateral direction and covered the scratched area. The 3D images indicated that different lithium compounds were formed and 90% of the scratched area was covered with the lithium protective layer over immersion time. A combined approach of morphology observations, electrochemical measurements, and ToF-SIMS showed the lithium protective layer offered good corrosion resistance. On the contrary, lithium provided fast and adequate leaching from the coating, demonstrating good active protection for aluminum and its alloys.

Study on Heat Transfer and Corrosion Resistance of Anodized Aluminum Alloy in Gallium-Based Liquid Metal

2019 ◽  
Vol 141 (1) ◽  
Author(s):  
Yuntao Cui ◽  
Yujie Ding ◽  
Shuo Xu ◽  
Yushu Wang ◽  
Wei Rao ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Liquid Metal ◽  
Effective Thermal Conductivity ◽  
Anodic Oxidation ◽  
Convective Heat Transfer Coefficient ◽  
Total Thickness ◽  
Anodized Aluminum

Gallium-based liquid metal (LM) inherits excellent thermophysical properties and pollution-free characteristics. However, it has long been a fatal problem that LM would cause serious corrosion and embrittlement on the classical substrate made of aluminum alloys in constructing chip cooling device. Here, anodic oxidation treatment was introduced on processing the aluminum alloy aiming to tackle the corrosion issues. The prepared anodic oxidation aluminum (AAO) coatings were composed of nanopore layers and barrier layers on a high-purity alumina matrix that were manufactured electrochemically. According to the measurement, the effective thermal conductivity of the anodized aluminum alloy increases with the total thickness of sample increasing. When the total thickness L exceeds 5 × 10−3 m, effects of the porous media on effective thermal conductivity are negligible via model simulation and calculation. It was experimentally found that aluminum alloy after surface anodization treatment presented excellent corrosion resistance and outstanding heat transfer performance even when exposed in eutectic gallium–indium (E-GaIn) LM over 200 °C. The convective heat transfer coefficient of LM for anodized sample reached the peak when the heat load is 33.3 W.

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.

Chitosan-based self-healing protective coatings doped with cerium nitrate for corrosion protection of aluminum alloy 2024

2012 ◽  
Vol 75 (1-2) ◽  
pp. 8-13 ◽  
Author(s):  
J. Carneiro ◽  
J. Tedim ◽  
S.C.M. Fernandes ◽  
C.S.R. Freire ◽  
A.J.D. Silvestre ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Protection ◽  
Protective Coatings ◽  
Cerium Nitrate ◽  
Self Healing ◽  
Aluminum Alloy 2024

KAISER ALUMINUM ALLOY 2024

Alloy Digest ◽  
1999 ◽  
Vol 48 (1) ◽  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
Aluminum Alloy ◽  
Physical Properties ◽  
Heat Treating ◽  
Kaiser Aluminum ◽  
Structural Applications ◽  
Aluminum Alloy 2024 ◽  
Hydraulic Valve

Abstract Kaiser Aluminum Alloy 2024 has good machinability and good mechanical properties. The alloy is typically used in aircraft structures, rivets, connectors, hydraulic valve bodies, and miscellaneous structural applications. This datasheet provides information on composition, physical properties, hardness, tensile properties, and shear strength as well as fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: AL-357. Producer or source: Tennalum, A Division of Kaiser Aluminum.

scholarly journals Pitting Corrosion Resistance of Anodized Aluminum Alloy Processed by Severe Plastic Deformation

2006 ◽  
Vol 70 (7) ◽  
pp. 534-540 ◽  
Author(s):  
In-Joon Son ◽  
Hiroaki Nakano ◽  
Satoshi Oue ◽  
Shigeo Kobayashi ◽  
Hisaaki Fukushima ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Severe Plastic Deformation ◽  
Pitting Corrosion ◽  
Anodized Aluminum ◽  
Pitting Corrosion Resistance

Interdiffusion of Elements in Aluminum 2024 Clad during Reheat Treatment Process at 495°C

2014 ◽  
Vol 896 ◽  
pp. 605-608
Author(s):  
Eddy Basuki ◽  
Sutarno ◽  
Samuel
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
High Temperatures ◽  
Treatment Process ◽  
Diffusion Behavior ◽  
Depletion Rate ◽  
Reheat Treatment ◽  
Aluminum Alloy 2024 ◽  
Al 2024

Aluminum alloy 2024 is normally strengthened with alloying elements of Cu and Mg. As these elements reduce the corrosion resistance of the materials, a pure Al clad is normally applied. Nevertheless, during ageing at high temperatures, inter-diffusion between elements can occur and causing the recession of the clad. This study investigates the inter-diffusion behavior Al 2024 clad at ageing temperature of 495°C and predicts the clad lifetime due to reheat treatment process. The depletion rate of clad was found at 0.8 μm per-hour of heat treatment. It is predicted that the thickness of the Al 2024 clad will no longer meet with the specifications on heat treatment for 42 hours at 495°C.

scholarly journals Performance of Protective Coatings for Aluminum Alloys in the Operating Conditions of Oil Production Equipment

2021 ◽  
Vol 225 ◽  
pp. 05003
Author(s):  
Oleg Shvetsov ◽  
Sergey Kondrat’ev
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Corrosion Rate ◽  
Protective Coatings ◽  
Production Equipment ◽  
Operating Conditions ◽  
Carbide Coating ◽  
Tungsten Carbide Coating ◽  
Drill Pipes

The paper investigates wear resistance and corrosion resistance of protective coatings of D16 aluminum alloy under conditions that simulate operation of drill pipes. The paper also presents microstructure of coatings, electrochemical potential and corrosion rate of D16 aluminum alloy with various coatings. We evaluated adhesion and wear resistance of these coatings. D16 alloy with a tungsten carbide coating has the widest range of service properties and can be used to effectively protect the surface of aluminum drill pipes during operation operation.

Influence of Technological Parameter on Boehmite Sol Sealing Anodized Al 2024 Alloy

2011 ◽  
Vol 337 ◽  
pp. 77-80 ◽  
Author(s):  
Qi Zhou ◽  
Xuan Xiao ◽  
Guang Jun Ren ◽  
En Jun Song ◽  
Yu Feng Wang
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Technological Parameter ◽  
Inorganic Salt ◽  
Acidic Solution ◽  
Distilled Water ◽  
Anodized Aluminum ◽  
2024 Alloy ◽  
The Stability ◽  
Al 2024

The boehmite sol is prepared with cheap inorganic salt Al(NO3)3and NH3H2O. The anodized aluminum alloy was sealed with the boehmite sol. Influences of concentration of Al3+, pH and temperature of sol on the properties of sol and the sealed film were studied. The results shows that the viscosity of sol increases and the stability becomes lower with the increase of Al3+concentration and pH of sol. The viscosities of sol become lower with the rises of its temperature. The thickness of anodized film increases when sealed with boehmite sol. The thickness value of sealed film increases with the increase of the sol viscosity. The properties of sealed film are better while the color of sol is azury. The corrosion resistance of sealed film was enhanced with the pH rising from 5.5 to 7 at the same concentrate and temperature of sol. The corrosion resistance in acidic solution is improved remarkably for sol sealed film as the sol temperature rises up to 60°C. The time of changing colour for sol sealing film is longer than that of the film sealed by distilled water.

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