scholarly journals Atmospheric Corrosion Behavior of 2A12 Aluminum Alloy in a Tropical Marine Environment

2015 ◽  
Vol 2015 ◽  
pp. 1-17 ◽  
Author(s):  
Zhongyu Cui ◽  
Xiaogang Li ◽  
Huan Zhang ◽  
Kui Xiao ◽  
Chaofang Dong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Marine Environment ◽  
Atmospheric Corrosion ◽  
Product Layer ◽  
Barrier Effect ◽  
Corrosion Morphology ◽  
Corrosion Product Layer ◽  
Morphology Changes

Atmospheric corrosion behavior of 2A12 aluminum alloy exposed to a tropical marine environment for 4 years was investigated. Weight loss of 2A12 alloy in the log-log coordinates can be well fitted with two linear segments, attributing to the evolution of the corrosion products. EIS results indicate that the corrosion product layer formed on the specimens exposed for 12 months or longer presents a good barrier effect. Corrosion morphology changes from pitting corrosion to severe intergranular corrosion with the extension of exposure time, resulting in the reduction of the mechanical properties.

scholarly journals Microstructure, Mechanical Properties and Corrosion Behavior of the Aluminum Alloy Components Repaired by Cold Spray with Al-Based Powders

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1633
Author(s):  
Zhiyi Zhang ◽  
Xiaoguang Sun ◽  
Shiming Huang ◽  
Xiaohui Han ◽  
Ping Zhu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Cold Spray ◽  
Corrosion Behavior ◽  
High Speed ◽  
Neutral Salt ◽  
Cold Spray Process ◽  
Spray Process ◽  
High Speed Trains ◽  
Mechanical Properties And Corrosion

Aluminum alloy components of high-speed trains have a great risk of being corroded by various corrosive medium due to extremely complex atmospheric environments. This will bring out huge losses and reduce the safety and stability of trains. In order to solve the problem, cold spray process was used for repairing the damage of the aluminum alloy components with Al-based powders. Microstructure, mechanical properties and corrosion behavior were studied. The results indicated that there were very few pores and cracks in the repaired areas after repairing. The average microhardness of the repaired areas was 54.5 HV ± 3.4 HV, and the tensile strength of the repaired samples was 160.4 MPa. After neutral salt spray tests for 1000 h, the rate of mass loss of the samples repaired by cold spray was lower than that of 6A01 aluminum alloy. The electrochemical test results showed that the repaired areas had a higher open circuit potential than 6A01 aluminum alloy. As a result, the repaired areas such as the anode protected its nearby substrate. The samples repaired by cold spray exhibited better corrosion than 6A01 aluminum alloy. Cold spray process and Al-based powders are applicable for repairing the aluminum alloy components of high-speed trains.

Effects of hydroxyapatite content on mechanical properties and in-vitro corrosion behavior of ZK60/HA composites

2020 ◽  
Vol 111 (8) ◽  
pp. 621-631
Author(s):  
Jie Teng ◽  
Zili Xu ◽  
Jinlong Su ◽  
Yuan Li
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Electrochemical Measurement ◽  
X Ray Diffraction ◽  
Corrosion Morphology ◽  
Hardness Tests ◽  
Zk60 Alloy ◽  
Immersion Testing

Abstract In this study, hydroxyapatite-reinforced ZK60 Mg alloybased composites were fabricated via a powder metallurgy route. The mechanical properties of these composites were studied by compressive tests and hardness tests. The in-vitro corrosion behavior was also investigated using immersion testing and electrochemical measurement. The influence of hydroxyapatite content on the mechanical properties and invitro corrosion behavior was evaluated. The microstructure and corrosion morphology were characterized by means of X-ray diffraction, optical and scanning electron microscopy. The results showed that the composite materials with 10 wt.% hydroxyapatite exhibited a better combination of mechanical strength and corrosion resistance. Compared with ZK60 alloy, the addition of 10 wt.% hydroxyapatite resulted in an increase in corrosion resistance by 38.6%.

scholarly journals Long-Term Atmospheric Corrosion Behavior of Epoxy Prime Coated Aluminum Alloy 7075-T6 in Coastal Environment

Materials ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 965 ◽  
Author(s):  
Sheng Zhang ◽  
Yuting He ◽  
Teng Zhang ◽  
Guirong Wang ◽  
Xu Du
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Atmospheric Corrosion ◽  
Coastal Environment ◽  
Aluminum Alloy 7075

Atmospheric corrosion behavior of low-alloy steels in a tropical marine environment

2019 ◽  
Vol 26 (12) ◽  
pp. 1315-1328 ◽  
Author(s):  
Zhao-liang Li ◽  
Kui Xiao ◽  
Chao-fang Dong ◽  
Xue-qun Cheng ◽  
Wei Xue ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Marine Environment ◽  
Atmospheric Corrosion ◽  
Low Alloy Steels ◽  
Alloy Steels

scholarly journals Corrosion Behavior of Reinforcing Steel Undergoing Stray Current and Anodic Polarization

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 261
Author(s):  
Zhipei Chen ◽  
Dessi Koleva
Keyword(s):  
Corrosion Behavior ◽  
Anodic Polarization ◽  
Cathodic Polarization ◽  
Product Layer ◽  
Reinforcing Steel ◽  
Stray Current ◽  
Polarization Effects ◽  
Steel Rebar ◽  
Corrosion Product Layer ◽  
Curing Regimes

Different concrete structures (viaducts, bridges, or tunnels) in the neighborhoods of railways may be subject to the stray current leaking from the rails. In these cases, the reinforcing rebars embedded in concrete act as conductors, “pick up” the stray current, and can corrode. For simulating the stray current-induced corrosion of metals, most researchers just supplied anodic polarization on samples. However, stray current induces both cathodic polarization and anodic polarization. This work experimentally justifies the different effects of stray current and anodic polarization on reinforcing steel embedded in mortar. A comparison between stray current and anodic polarization effects on the corrosion behavior of embedded steel is performed for both fresh (24 hour-cured) and hardened matrix (28 day-cured) in chloride-free (Cl-free) and chloride-containing (Cl-containing) environments. It is found that in all studied conditions, anodic polarization leads to a significantly different electrochemical performance of the steel rebar compared to the stray current. Hence, anodic polarization cannot reflect all the effects of stray current, and therefore, it has limited significance for simulating stray current. It is also clarified that the curing regimes and starting time of the stray current play significant roles in the formation of a corrosion product layer on the steel surface.

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