Effect of Oxide Film on the Cavitation Erosion-Corrosion Behavior of Nickel-Aluminum Bronze Alloy

CORROSION ◽  
10.5006/3348 ◽  
2020 ◽  
Vol 76 (12) ◽  
Author(s):  
Zhenbo Qin ◽  
Lifang Cao ◽  
Yida Deng ◽  
Cheng Zhong ◽  
Wenbin Hu ◽  
...  
Keyword(s):  
Oxide Film ◽  
Cavitation Erosion ◽  
Pulse Mode ◽  
Open Circuit ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Nacl Solution ◽  
Total Contribution ◽  
Erosion Corrosion ◽  
Nickel Aluminum Bronze

The effect of oxide film on the cavitation erosion-corrosion of nickel-aluminum bronze (NAB) alloy in 3.5 wt% NaCl solution was investigated via pulse and continuous cavitation modes of ultrasonic vibrator device according to ASTM. NaCl solution was used to simulate the seawater condition of NAB alloy. In the same effective cavitation erosion time of 8 h, the total mass loss caused by continuous cavitation erosion-corrosion was 21.45±0.75 mg, which was almost 1.5 times as much as that of pulse mode. The synergistic effect of cavitation erosion and corrosion was analyzed. The results showed that the total contribution of the synergy component in the process of continuous cavitation erosion-corrosion was 51.66%, while it fell to 25.56% in the pulse mode. The open-circuit potential measurements and electrochemical atomic force microscope test demonstrated that the rapid repair of an oxide film during pulse cavitation played an important role in resisting the cavitation erosion-corrosion. Furthermore, the formation process of oxide film was in situ observed, indicating higher nucleation rate compared with its growth rate. Also, the alloy with such film exhibited lower synergy in pulse mode than that without film in continuous mode.

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.

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.

scholarly journals Evolution of the Corrosion Product Film on Nickel-Aluminum Bronze and Its Corrosion Behavior in 3.5 wt % NaCl Solution

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 209 ◽  
Author(s):  
Yang Ding ◽  
Rong Zhao ◽  
Zhenbo Qin ◽  
Zhong Wu ◽  
Liqiang Wang ◽  
...  
Keyword(s):  
Corrosion Product ◽  
Aluminum Bronze ◽  
Protective Film ◽  
Nickel Aluminum ◽  
Nacl Solution ◽  
Corrosion Attack ◽  
Corrosion Product Film ◽  
Product Film ◽  
Nickel Aluminum Bronze

The in-situ studies of the corrosion product film on nickel-aluminum bronze are significant for explaining the mechanism of its corrosion resistance. In this paper, the corrosion behavior of nickel-aluminum bronze and the formation process of the protective film in 3.5 wt % NaCl solution are systematically investigated. The results of scanning electron microscope analysis and electrochemical tests indicate that the corrosion resistance of nickel-aluminum bronze is improved due to the formation of the corrosion product film. The change of local electrochemical property on the corrosion product film during the immersion time is evaluated via in-situ scanning vibrating electrode technique, and it reveals the evolution rules of ionic flux in real time. The formation process of the protective film on different phases in nickel-aluminum bronze is observed directly by in-situ atomic force microscopy as height change measurements. The α phases at different locations present different corrosion behaviors, and the lamellar α phase within the α + κIII eutectoid structure gets more serious corrosion attack. The κ phases establish a stable and dense protective film in short time, preventing the corrosion attack effectively. The β′ phase, however, suffers the most serious corrosion damage until a protective film is formed after 150 min of immersion.

Preliminary Development of Cold Spray Procedures for Nickel Aluminum Bronze Casting Repair

2021 ◽  
Vol 1016 ◽  
pp. 971-977
Author(s):  
Cameron Munro ◽  
Phuong Vo ◽  
Bruno Guerreiro
Keyword(s):  
Cold Spray ◽  
Cavitation Erosion ◽  
High Heat ◽  
Spray Parameters ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Corrosion Performance ◽  
High Heat Input ◽  
Nickel Aluminum Bronze ◽  
Bronze Casting

Nickel aluminum bronze (NAB) castings possess favourable combinations of strength and resistance to corrosion, biofouling and cavitation/erosion, and so have long been used in naval applications. Nonetheless, in seawater environments NAB castings are susceptible to selective phase corrosion and so such components periodically require either replacement, which is very costly, or repair. However, repairs involving traditional, high heat input welding operations can lead to distortion and microstructural changes that unacceptably degrade NAB corrosion performance, and so repairs are not commonly performed. In the present work, cold spray is explored as an alternative for NAB (alloy CuAl9Fe5Ni5) repair without excessive distortion or base metal degradation, and preliminary results of its performance reported. Suitable cold spray parameters have been determined using an iterative approach by analyzing deposits in terms of microstructure, porosity and adhesion to the substrate. It is intended that these parameters will later be used to create simulated repairs which can be more thoroughly characterized for strength, toughness and corrosion performance.

Comparison of Corrosion and Cavitation Erosion Behaviors Between the As-Cast and Friction-Stir-Processed Nickel Aluminum Bronze

CORROSION ◽  
10.5006/0984 ◽  
2013 ◽  
Vol 69 (11) ◽  
pp. 1111-1121 ◽  
Author(s):  
Q.N. Song ◽  
Y.G. Zheng ◽  
S.L. Jiang ◽  
D.R. Ni ◽  
Z.Y. Ma
Keyword(s):  
Cavitation Erosion ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Friction Stir ◽  
Nickel Aluminum Bronze
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