Influence of Heat Treatment on Corrosive Property of 5083 Aluminum Alloy

2013 ◽  
Vol 779-780 ◽  
pp. 205-211 ◽  
Author(s):  
Chun Hong Li ◽  
Chun Mei Li ◽  
Deng Ming Chen
Keyword(s):  
Heat Treatment ◽  
Intergranular Corrosion ◽  
Corrosion Potential ◽  
Electrochemical Corrosion ◽  
Nacl Solution ◽  
Corrosion Properties ◽  
Corrosion Phenomenon ◽  
Cold Rolled ◽  
5083 Aluminum Alloy ◽  
Corrosive Property

The microstructure and intergranular corrosion phenomenon were investigated by means of optical imaging,SEM and EDS. Hardness was conducted and electrochemical corrosion properties were researched in 3.5% Nacl solution by electrochemical tester.The result showed, there was no intergranular corrosion phenomenon when the samples underwent cold rolling and stabilization heat treatment;The intergranular corrosion was obviously when the samples were annealed at 180°C for 90h or 150h;The corrosion potential of TO1 state annealed at 180°C for 90h and TO2 state annealed at 180°C for 150h was lower than cold rolled and stabilization heat treatment samples，they were more susceptible to electrochemical corrosion.

scholarly journals Corrosion Resistance of X5CrNi18-10 Stainless Steel

2017 ◽  
Vol 62 (4) ◽  
pp. 2101-2106
Author(s):  
M. Kciuk ◽  
S. Lasok
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Polarization Resistance ◽  
Corrosion Potential ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
Nacl Solution ◽  
Corrosion Properties ◽  
Eds Microanalysis ◽  
Scanning Electron

AbstractThe paper presents the influence of heat treatment on the structure and corrosion resistance of X5CrNi18-10 steel. To determine the structure which has been obtained after heat treatment the methods of light and scanning electron microscopy with EDS microanalysis were used. The electrochemical corrosion properties of the investigated steel were studied in 3.5% NaCl solution using potentiodynamic polarization tests. Basing on the registered curves, the corrosion current, polarization resistance and corrosion potential were determined. The corrosion tests were followed by fractographic researches.

scholarly journals Effect of Combined Extrusion and Rolling Parameters on Mechanical and Corrosion Properties of New High Strength Al-Mg Alloy

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 445
Author(s):  
Kweon-Hoon Choi ◽  
Bong-Hwan Kim ◽  
Da-Bin Lee ◽  
Seung-Yoon Yang ◽  
Nam-Seok Kim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Current Density ◽  
Intergranular Corrosion ◽  
Artificial Aging ◽  
Corrosion Potential ◽  
Volume Fraction ◽  
High Strength ◽  
Mg Alloy ◽  
Corrosion Properties

High strength Al-Mg alloy is an attractive material that has the characteristic of increasing both strength and elongation by adding more solute Mg. However, there is a limitation in the oxidation issue during the casting process when it contains high amounts of solute Mg. New Al-Mg alloy was developed using Mg+Al2Ca master alloy by making a stable CaO/MgO mixed layer that no significant oxidation occurred. Here, the intergranular corrosion (IGC), electrochemical, and mechanical properties of new Al-Mg alloys fabricated through a combined process of extrusion and cold rolling were studied after the specimens went through artificial aging heat treatment at 200 °C. The results show that the grain size and the volume fraction of anodic β-precipitation (Mg2Al3) forming on the grain boundary influence the intergranular corrosion results. Corrosion potential and current density were achieved by potentiodynamic polarization electrochemical test. The results show that corrosion potential remains irrespective of the manufacturing process, while current density increases with artificial aging treatment. Both hardness and tensile mechanical properties decrease on cold rolled specimens after the heat treatment, while increase in extrusion and annealed specimens.

Study on Anodic Oxidation of 2024 Aluminum Alloys in Sulfuric-Citric Acid

2014 ◽  
Vol 788 ◽  
pp. 236-242 ◽  
Author(s):  
Xiang Feng Meng ◽  
Guo Ying Wei ◽  
Xi Xi Zhao ◽  
Hong Liang Ge
Keyword(s):  
Corrosion Resistance ◽  
Citric Acid ◽  
Anodic Oxidation ◽  
Corrosion Potential ◽  
Electrochemical Corrosion ◽  
Mixed Solution ◽  
Nacl Solution ◽  
Maximum Hardness ◽  
Anodized Aluminum ◽  
Electrochemical Corrosion Resistance

Porous anodic alumina has been obtained through anodic oxidation in a mixed solution of sulfuric and citric acid. We investigated the microstructure and morphology of 2024 aluminum after being anodically oxidized under different voltage and temperature. Hardness and corrosion resistance of anodized aluminum has been also investigated. The results show that after anodization, many nanoholes appeared on the surface layer of the coating. Thickness of the anodized film increased from 2.7μm to 26.3μm with the voltage changing from 10 V to 18 V. Aodized films with the thickness of 18μm could be obtained under the temperature of 47°C. When the oxidation voltage is 12V, the hardness of the oxidation film reached 126HV. Maximum hardness (130 HV) could be achieved when the oxidation temperature was 57°C. After being dealt with in the NaCl solution, the electrochemical corrosion resistance of the anodic film got a sharp increase, and the anodic oxidation voltage had a great impact on the anodized film. When the oxidation voltage was 16V, the corrosion resistance of the film reached the highest value and the corrosion voltage was-0.7V. From the polarization curves, it has been found that the films obtained under the temperature of 37°C possessed more positive corrosion potential (-0.73V) and optimal anticorrosion performance.

Effect of heat treatment on microstructure and corrosion resistance of extruded ZK80 Mg alloy

2019 ◽  
Vol 9 (9) ◽  
pp. 1092-1099
Author(s):  
Fenghong Cao ◽  
Chang Chen ◽  
Zhenyu Wang
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Aging Time ◽  
Room Temperature ◽  
Aging Treatment ◽  
Corrosion Process ◽  
Corrosion Mechanism ◽  
Nacl Solution ◽  
Corrosion Properties

The corrosion characteristics and corrosion mechanism of the extruded ZK80 alloy with different states soaking in 3.5% NaCl solution at room temperature were analyzed via OM, SEM, EDS, XRD and static weightlessness method and other experimental analysis methods. The results show that when the aging temperature is constant, and the corrosion rate decreases with the lengthen of aging time, while when the corrosion time is constant, the corrosion rate increases with the increase in aging time. Appropriate aging treatment not only refines the grain of the alloy, but also precipitates the Mg–Zn phase which can effectively prevent the corrosion process and improve the anti-corrosion properties of the alloy. The main corrosion characteristics of the alloy are filamentary corrosion and pitting corrosion.

Effect of Welding Speed on the Microstructure and Corrosion Properties of Weld and Heat Affected Zones in GTA Welded AA2014 Alloy

2019 ◽  
Vol 969 ◽  
pp. 834-838
Author(s):  
M.P. Shankar ◽  
R. Sokkalingam ◽  
Bhavani Kosuri ◽  
K. Sivaprasad ◽  
V. Muthupandi
Keyword(s):  
Fusion Zone ◽  
Welding Speed ◽  
Corrosion Potential ◽  
Gta Welding ◽  
Optical Microscope ◽  
Nacl Solution ◽  
Corrosion Properties ◽  
Gas Tungsten Arc ◽  
Aa2014 Alloy ◽  
Weld Fusion Zone

The microstructure and corrosion properties of weld fusion zone and the heat affected zones of gas tungsten arc (GTA) welded AA2014 alloy, welded at varying speeds of 1.5mm/s, 2.5 mm/s and 3.5 mm/s were examined for gaining knowledge on the effect of welding speed on corrosion behavior at localized regions of the weldment. The macrostructure and microstructure of the welds were evaluated with optical microscope. The corrosion properties were examined with potentiodynamic polarization in aqueous 3.5% NaCl solution. The GTA welding has resulted in grain refinement fusion zone and dispersion of coarse Al2Cu phases within the grains and along the grain boundaries of heat affected zones. With increase in welding speed the grain size of AA2014 at the fusion zone reduces significantly and also the corrosion resistance of the fusion zone and heat affected zone could decrease as it shows higher negative corrosion potential.

scholarly journals Effect of surface treatment by sandblasting on the quality and electrochemical corrosion properties of a C-1020 carbon steel used by an Algerian oil company

2019 ◽  
Vol 272 ◽  
pp. 01001
Author(s):  
Nadia HAMMOUDA ◽  
Kamel BELMOKRE
Keyword(s):  
Carbon Steel ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Surface Preparation ◽  
Nacl Solution ◽  
Corrosion Properties ◽  
Good Surface ◽  
Oil Company ◽  
Mechanical Surface ◽  
Effect Of Surface

The purpose of the different operations under the term surface preparation is to get a clean surface able to be coated. It is essential to adapt this preparation in terms of the metallurgical nature of the substrate, cleanliness, its shape and roughness. Surface preparations especially the operations of sandblasting, polishing, or grinding prove of capital importance. It allows to modify the superficial properties of these materials, after these treatments the surface becomes very active. This paper evaluates the mechanical surface treatments effect by sandblasting (Sa 1.5 and Sa 2.5) on the electrochemical corrosion characteristics of C-1020 carbon steel in 3% NaCl solution electrolyte simulating aggressive sea atmosphere. Investigations are conducted using stationary (free potential "E-t, polarization curves "E-i", the Tafel rights and the Rp) and nonstationary electrochemical tools such as electrochemical impedance. The results obtained allowed us to highlight that sandblasted carbon steel degrades with immersion time because of the roughness of the surface. These results were confirmed by the plot of the electrochemical impedance diagrams, confirming that the process governing kinetics is under charge transfer control. Good protection against corrosion cannot be obtained only with a good surface preparation of the adapted steel.

The Influences of Additives and Heat Treatment on the Properties of Electroless Plating Ni-W-Mo-P Alloy on the Aluminum

2014 ◽  
Vol 941-944 ◽  
pp. 1585-1588
Author(s):  
Zu Xiao Yu ◽  
De Tao Zheng ◽  
Hong Guo ◽  
Yong Liu ◽  
Yuan Liang Luo ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Deposition Rate ◽  
Electroless Plating ◽  
Corrosion Potential ◽  
Alloy Coating ◽  
Corrosion Current ◽  
Maximum Hardness ◽  
Corrosion Properties

To improve the wear resistance and anti-corrosion properties of the aluminum, the electroless plating Ni-W-Mo-P alloy on the aluminum is necessary. The influences of heat treatment and additives (stabilizers) on the porosity, deposition rate, corrosion current, corrosion potential, microhardness and wear resistance of electroless plating Ni-W-Mo-P alloy coating, were investigated using electrochemical methods, etc. The results show that the deposition rate and anti-corrosion properties of electroless plating Ni-W-Mo-P are improved when the stabilizers, including KI (1mg/L) and “KIO3 (1mg/L) + Pb (Ac)2 (1mg/L)”, are added into bath, respectively. In addition, the maximum hardness (902 HV) and good wear resistance of Ni-W-Mo-P coatings are obtained when heated at 400°C (1h). However, its corrosion resistance is worse. Its microhardness is also obviously improved after heated at 200°Cfor 6 h, and the microhardness reaches to 950 HV.

Effect of ECAP on the Electrochemical Behavior of Chromium Bronze

2011 ◽  
Vol 239-242 ◽  
pp. 98-101
Author(s):  
Ya Ni Zhang ◽  
Chang Zheng Xu ◽  
Mao Sheng Zheng ◽  
Jie Wu Zhu
Keyword(s):  
Electrochemical Behavior ◽  
Corrosion Potential ◽  
Nacl Solution ◽  
Angular Pressing ◽  
Fine Grain ◽  
Ecap Process ◽  
Electrode Cell ◽  
Cold Rolled ◽  
Chromium Bronze ◽  
The Difference

The effect of equal channel angular pressing (ECAP) process on the electrochemical behavior of chromium bronze in NaCl solution was investigated by three-electrode cell setup. The result shows the difference of electrochemical behavior between X plane and Y plane is still exist, and even in the unodd number passes for “route C” of ECAP process. ECAP process don’t change the corrosion nature of chromiun bronze, but the corrosion potential of 12 passes ultra-fine grain (UFG) chromium bronze is a little more positive than that of 0 pass chromium bronze. For better understanding the effect of ECAP on the electrochemical behavior of chromium bronze, we chose the cold-rolled materials with the same composition as reference materials. The result shows that ECAP process is more benefical to electrochemical behavior of chromium bronze than cold-rolled process. On the other hand, the result of EIS also shows that ECAP process is more benefical to form compacted corrosion layers on the surface of specimens.

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