Hardness and Corrosion Behavior of Aged 6063 Al Alloy

2014 ◽  
Vol 1046 ◽  
pp. 54-57 ◽  
Author(s):  
Chun Lin He ◽  
Xiao Dan Meng ◽  
Guo Feng Ma ◽  
Jian Ming Wang ◽  
Zhao Fu Du ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Intergranular Corrosion ◽  
Corrosion Test ◽  
Artificial Aging ◽  
Galvanic Corrosion ◽  
Peak Hardness ◽  
Al Alloy ◽  
Accelerated Corrosion ◽  
6063 Al Alloy ◽  
Accelerated Corrosion Test

The effect of artificial aging on the corrosion properties of 6063 Al alloy was investigated by optical microscope, field emission scanning electron microscope (FE-SEM) and accelerated corrosion test. Accelerated corrosion test revealed that the corrosion resistance of the alloy strongly depended on artificial aging times, and the corrosion weight gain curve of the aged alloy was greatly in agreement with that of hardness vs. aging times, showing that the lowest corrosion resistance was exhibited at peak aged condition. It is found that pitting is the main corrosion form for the 6063 aluminum alloy aged with different times at 210°C, and slight intergranular corrosion is also found at peak hardness. It is believed that pitting results from galvanic corrosion between Al9Fe2Si2 particles and matrix Al while intergranular corrosion results from galvanic corrosion between Mg2Si and matrix Al.

Effect of Artificial Aging on Intergranular Corrosion of 6063 Al Alloy

2013 ◽  
Vol 842 ◽  
pp. 275-278 ◽  
Author(s):  
Jian Ming Wang ◽  
Xiao Dan Meng ◽  
Ying Ying Bai ◽  
Guo Feng Ma ◽  
Yan Liu ◽  
...  
Keyword(s):  
Intergranular Corrosion ◽  
Corrosion Test ◽  
Artificial Aging ◽  
Al Alloy ◽  
Corrosion Properties ◽  
Corrosion Morphology ◽  
Accelerated Corrosion ◽  
Surface Corrosion ◽  
6063 Al Alloy ◽  
Accelerated Corrosion Test

The effect of artificial aging on the corrosion properties of 6063 Al alloy was investigated by optical microscope, field emission scanning electron microscope and accelerated corrosion test. Accelerated corrosion test revealed that the alloy was susceptible to intergranular corrosion (IGC) in the artificial aged conditions according to the surface corrosion morphology, and the IGC resistance was reduced as the aging time was prolonged, resulting from more Mg2Si grain boundary precipitates formed. However, the corroded cross-sections showed that the IGC was very local. Additionally, the surface corrosion morphology also showed that pitting corrosion took place, resulting from galvanic corrosion between (FeMn)3Si12Al15 particles and matrix Al.

Effect of Artificial Aging on Salt Spray Corrosion Resistance of 2024 Al Alloy

2014 ◽  
Vol 1046 ◽  
pp. 50-53
Author(s):  
Chun Lin He ◽  
Yan Liang ◽  
Ying Ying Bai ◽  
Guo Feng Ma ◽  
Jian Ming Wang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Weight Gain ◽  
Intergranular Corrosion ◽  
Corrosion Test ◽  
Artificial Aging ◽  
Salt Spray ◽  
Aged Alloy ◽  
Al Alloy ◽  
Accelerated Corrosion ◽  
Accelerated Corrosion Test

The effect of artificial aging on the corrosion resistance of 2024 Al alloy was investigated by field emission scanning electron microscope (FE-SEM) and accelerated corrosion test. For comparison, the solution treatment followed by air-cooled and water-quenched samples were also researched. Accelerated corrosion test revealed that the corrosion resistance of the alloy strongly depended on artificial aging times, and the weight gain of the aged alloy increased first and then decreased with increasing the aging times, and a maximum value was found at peak aged condition. The air-cooled sample had the highest weight gain while the water-quenched one had the lowest weight gain among all the samples. The corrosion morphologies showed that pitting and localized intergranular corrosion were the main corrosion forms for the air-cooled and aged 2024 Al alloys. However, only pitting corrosion took place on the water-quenched samples. The pitting and intergranular corrosion resulted from galvanic corrosion between secondary particles and matrix Al, and between grain boundary precipitates and matrix Al, respectively.

Alloying Element Nickel Influence on Microstructure and Properties of Weathering Steels

2011 ◽  
Vol 295-297 ◽  
pp. 1436-1440 ◽  
Author(s):  
Zhi Yong Liu ◽  
Xin Lai He ◽  
Ji Qing Chen ◽  
Shan Wu Yang ◽  
Bang Wen Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Corrosion Test ◽  
Nickel Content ◽  
Alloying Element ◽  
Accelerated Corrosion ◽  
Corrosion Resistant ◽  
Microstructure And Properties ◽  
Microstructure Observation ◽  
Accelerated Corrosion Test

By testing the mechanical properties, microstructure observation, accelerated corrosion test, the effect of alloying element nickel on microstructure and properties of weathering steels was studied. The results showed that nickel content from 0 to 0.44%（mass percent）have little influence on microstructure and mechanical properties of weathering steels.The corrosion resistance enhanced with increasing nickel content, and nickel content of 0.11% or more had significant enfluence on corrosion resistant performance of weathering steels.

Effect of Homogenization Treatment on Microstructure and Properties of ZnAl15 Alloy

2014 ◽  
Vol 875-877 ◽  
pp. 1250-1254 ◽  
Author(s):  
Xin Qi Yan ◽  
Yong Chen ◽  
Sheng Xin Liu ◽  
Wei Min Long ◽  
Jun Lan Huang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Test ◽  
Room Temperature ◽  
Discontinuous Precipitation ◽  
Accelerated Corrosion ◽  
Homogenization Treatment ◽  
Lamellar Structures ◽  
Α Phase ◽  
Supersaturated Solid Solutions ◽  
Accelerated Corrosion Test

The microstructure, microhardness and corrosion resistance of as-cast and as-annealed ZnAl15 alloys were investigated by OM, SEM, EDX and DSC techniques. It was found that microstructure of as-cast ZnAl15 alloy was primary dendrites and eutectic matrix. But Primary discontinuous precipitation of αs and βs phase occurred at room temperature. During homogenization treatment, discontinuous precipitation of αs and βs phase occurred completely and accompanied with emitting heat. The final microstructures of decomposed αs and βs phase in primary dendrites were fine and coarse lamellar structures respectively. The final microstructures of decomposed βs, which located at the edges of the αs phases or in eutectic matrix were that α phase distributed in η matrix. The microhardness of both primary dendrites and eutectic matrix in ZnAl15 alloys decreased after homogenization treatment due to the decomposition of supersaturated solid solutions. The result of accelerated corrosion test showed that homogenization treatment has a certain beneficial effect on the corrosion resistance of ZnAl15 alloy.

Ultra-Low Carbon High Strength Weathering Steels

2011 ◽  
Vol 317-319 ◽  
pp. 236-239
Author(s):  
Zhi Yong Liu ◽  
Xin Lai He ◽  
Shan Wu Yang ◽  
Qiang Xue Zhou
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Test ◽  
High Strength ◽  
Weathering Steel ◽  
Low Carbon ◽  
Accelerated Corrosion ◽  
Corrosion Resistant ◽  
Test Steel ◽  
Accelerated Corrosion Test ◽  
Electronic Microscope

The ultra-low carbon high strength weathering steel was trial manufactured. By Optical micrographs observation, scanning electronic microscope (SEM), transmission electronic microscope (TEM), accelerated corrosion test, the corrosion resistant performance of test steel and CortenB steel were studied. The results showed that yield strength, tensile strength, elongation and -40 °C impact energy of test steel reached 510MPa, 600MPa, 22% and 115J, respectively. Corrosion resistance of test steel was superior to that of CortenB. The microstructure of ferrite and bainite, quickly forming adhesive dense rust layers to improve the corrosion resistance of test steel.

Research on Corrosion Resistance Properties of Post-Tensioned Prestress Duct Grouting

2013 ◽  
Vol 275-277 ◽  
pp. 1250-1256
Author(s):  
Xiao Wei Feng ◽  
Yong Wang
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Test ◽  
Protective Layer ◽  
Structural Safety ◽  
Accelerated Corrosion ◽  
Important Indicator ◽  
Current Specification ◽  
Accelerated Corrosion Test ◽  
Harmful Substances ◽  
Post Tensioned

The corrosion resistance of post-tensioned prestress grout is considered an important indicator to structural safety and durability, based on some current specification on slurry anti-corrosion requirements of prestressing tendons at home and abroad, through laboratory accelerated corrosion test this paper mainly analyzes the diffusion way of harmful substances in the slurry, the relationships between rust time and prestressing tendons protective layer thickness, and then according to selected materials with different proportions have different corrosion time, take QL + ZQ is the best choice in anti-corrosion.

Evaluation on the Mechanical and Corrosion Resistance of ALDC 12 Al Alloy by Three Types of Heat Treatments

2017 ◽  
Vol 744 ◽  
pp. 249-253
Author(s):  
Kyung Man Moon ◽  
Sung Yul Lee ◽  
Jae Hyun Jeong ◽  
Myeong Hoon Lee
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Artificial Aging ◽  
Galvanic Corrosion ◽  
Natural Aging ◽  
Heat Treatments ◽  
Al Alloys ◽  
Hot Water ◽  
Al Alloy ◽  
Artificial Heat

Al is a active metal. However, it has a generally fine oxide film with thin and protective barrier, which is stable in air and neutral aqueous solution. Thus, Al alloys have been widely used in architectural trim, cold & hot-water storage vessels and piping. However, Al and most of their alloys may be easy to be corroded with various patterns of corrosion such as pitting, intergranular and galvanic corrosion etc. in the case of exposure to various industrial and marine corrosive environments. Therefore, an optimum evaluation of corrosion resistance for Al and Al alloys may be more important in a economical point of view. In this study, characteristics evaluation for ALDC 12 Al alloy by solution, normalizing, and aging (natural and artificial) heat treatments was carried out using electrochemical methods etc.. We can see that the hardness of ALDC 12 Al alloy were decreased by solution and aging heat treatments, in particular, the solution and natural aging (SNA) heat treatments indicated the lowest value of hardness. However, the lower hardness by heat treatment, the better corrosion resistance, for instance, the solution and natural aging (SNA) heat treatment exhibited the best corrosion resistance with showing the lowest hardness. Furthermore, the highest hardness was observed after normalizing and artificial aging (NAA) heat treatments. Therefore, it is considered that if improvement of the hardness as well as the corrosion resistance were to be required together, the normalizing and artificial aging (NAA) heat treatment should be performed. On the other hand, the solution and natural aging (SNA) heat treatment is thought to be an optimum heat treatment method for only corrosion resistance improvement.

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