scholarly journals Corrosion Behavior of Heat Treated Nickel-Aluminum Bronze Alloy in Artificial Seawater

2011 ◽  
Vol 02 (11) ◽  
pp. 1542-1555 ◽  
Author(s):  
Ashkan Vakilipour Takaloo ◽  
Mohammad Reza Daroonparvar ◽  
Mehdi Mazar Atabaki ◽  
Kamran Mokhtar
Keyword(s):  
Corrosion Behavior ◽  
Artificial Seawater ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Bronze Alloy ◽  
Heat Treated ◽  
Nickel Aluminum Bronze

scholarly journals Effect of Fluid Flow on the Corrosion Performance of as-Cast and Heat-Treated Nickel Aluminum Bronze Alloy (UNS C95800) in Saline Solution

2021 ◽  
Vol 2 (1) ◽  
pp. 61-77
Author(s):  
Hamid Reza Jafari ◽  
Ali Davoodi ◽  
Saman Hosseinpour
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Flow Rate ◽  
Solution Temperature ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Nacl Solution ◽  
Flow Conditions ◽  
Heat Treated ◽  
Nickel Aluminum Bronze

In this work, the corrosion behavior and surface reactivity of as-cast and heat-treated nickel aluminum bronze casting alloy (UNS C95800) in 3.5 wt% NaCl solution is investigated under stagnant and flow conditions. Increasing flow rate conditions are simulated using a rotating disk electrode from 0 to 9000 revolutions per minute (rpm). Optical micrographs confirm the decrease in the phase fraction of corrosion-sensitive β phase in the microstructure of C95800 after annealing, which, in turn, enhances the corrosion resistance of the alloy. Electrochemical studies including open circuit potentiometry, potentiodynamic polarization, and electrochemical impedance spectroscopy are performed to assess the effect of flow rate and heat treatment on the corrosion of samples at 25 and 40 °C in 3.5 wt% NaCl solution. For both as-cast and heat-treated samples, increasing the flow rate (i.e., electrode rotating rate) linearly reduces the corrosion resistance, indicating that the metal dissolution rate is significantly affected by hydrodynamic flow. Increasing the solution temperature negatively impacts the corrosion behavior of the as-cast and heat-treated samples at all flow conditions.

Mechanical Properties at High Temperatures and Microstructures of a Nickel Aluminum Bronze Alloy

2013 ◽  
Vol 683 ◽  
pp. 82-89 ◽  
Author(s):  
Borpit Thossatheppitak ◽  
Surasak Suranuntchai ◽  
Vitoon Uthaisangsuk ◽  
Anchalee Manonukul ◽  
Pinai Mungsuntisuk
Keyword(s):  
Mechanical Properties ◽  
High Temperatures ◽  
Flow Behavior ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Bronze Alloy ◽  
Heat Treated ◽  
Different Temperatures ◽  
Machine Parts ◽  
Nickel Aluminum Bronze

Nickel Aluminum Bronze (NAB) alloys have been widely used in different kinds of machine parts where the superior resistance to corrosion and erosion in saltwater is needed. In this work, mechanical properties at high temperatures and microstructures of a NAB alloy were investigated. First, NAB specimens were prepared as an as-cast ingot and were subsequently heat-treated at 675°C for 6 hours in order to improve microstructure and mechanical properties. The mechanical properties at high temperatures in form of the plastic flow curves of the NAB alloy were characterized by a deformation dilatometer. The NAB samples were compressed at high temperature and rapidly cooled down to room temperature. The deformation temperatures of 825°C, 850°C and 900°C, a strain rate of 0.01 s-1, and a maximum compression strain of 0.4 were considered. The influences of the temperature on flow behavior of the NAB alloy were investigated. The plastic stress-strain curves at different temperatures were compared with regard to the rate of material strain hardening and softening. It was found that the compression stresses decreased with increasing temperatures. Additionally, the resulted hardness and microstructures of the alloy after forming at high temperatures were analyzed.

The corrosion behavior of Ni-Cu gradient layer on the nickel aluminum-bronze (NAB) alloy

2018 ◽  
Vol 138 ◽  
pp. 8-19 ◽  
Author(s):  
Qin Luo ◽  
Zhenbo Qin ◽  
Zhong Wu ◽  
Bin Shen ◽  
Lei Liu ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Gradient Layer ◽  
Nickel Aluminum Bronze

scholarly journals Effect of Weld and Surface Defects on the Corrosion Behavior of Nickel Aluminum Bronze in 3.5% NaCl Solution

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1227
Author(s):  
Xu Zhao ◽  
Yuhong Qi ◽  
Jintao Wang ◽  
Tianxiang Peng ◽  
Zhanping Zhang ◽  
...  
Keyword(s):  
Corrosion Product ◽  
Corrosion Behavior ◽  
Early Stage ◽  
Optical Microscope ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Nacl Solution ◽  
Corrosion Product Film ◽  
Product Film ◽  
Nickel Aluminum Bronze

To study the effect of weld and defects on the corrosion behavior of nickel aluminum bronze (UNS C95810) in 3.5% NaCl solution, the weight loss, X-ray diffraction, optical microscope, scanning electron microscope and electrochemical test of the specimen with weld and defects were investigated. The results show that the presence of weld and defects increases the corrosion rate of bronze. Weld does not change the structure of the corrosion product film, but defects induce a lack of the protective outermost corrosion product in bronze. Weld makes the corrosion product film in the early stage more porous. Defects always produce an increase in the dissolution rate of the bronze.

The role of 4-amino-5-phenyl-4H-1,2,4-triazole-3-thiol in the inhibition of nickel–aluminum bronze alloy corrosion: electrochemical and DFT studies

2011 ◽  
Vol 38 (1) ◽  
pp. 91-103 ◽  
Author(s):  
Ahmed Y. Musa ◽  
Anees A. Khadom ◽  
Abdul Amir H. Kadhum ◽  
Mohd Sobri Takriff ◽  
Abu Bakar Mohamad
Keyword(s):  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Dft Studies ◽  
Bronze Alloy ◽  
Nickel Aluminum Bronze
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