Effect of Sulfide Concentration on the Corrosion and Cavitation Erosion Behavior of a Manganese-Aluminum Bronze in 3.5% NaCl Solution

2019 ◽  
Vol 28 (7) ◽  
pp. 4053-4064 ◽  
Author(s):  
Q. N. Song ◽  
N. Xu ◽  
X. Jiang ◽  
Y. Liu ◽  
Y. Tong ◽  
...  
Keyword(s):  
Cavitation Erosion ◽  
Sulfide Concentration ◽  
Aluminum Bronze ◽  
Nacl Solution ◽  
Erosion Behavior ◽  
Manganese Aluminum

Cavitation Erosion Behavior and Mechanism of HVOF Sprayed WC-10Co-4Cr Coating in 3.5 wt% NaCl Solution

2014 ◽  
Vol 68 (1) ◽  
pp. 151-159 ◽  
Author(s):  
Sheng Hong ◽  
Yuping Wu ◽  
Jianfeng Zhang ◽  
Yugui Zheng ◽  
Yujiao Qin ◽  
...  
Keyword(s):  
Cavitation Erosion ◽  
Nacl Solution ◽  
Erosion Behavior

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.

Cavitation erosion behavior of hydraulic concrete under high-speed flow

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xin Wang ◽  
Ting-Qiang Xie
Keyword(s):  
Cavitation Bubble ◽  
High Speed ◽  
Cavitation Erosion ◽  
Concrete Strength ◽  
Bubble Collapse ◽  
High Speed Flow ◽  
Content Type ◽  
Erosion Behavior ◽  
Hydraulic Concrete ◽  
Speed Flow

Purpose Cavitation erosion has always been a common technical problem in a hydraulic discharging structure. This paper aims to investigate the cavitation erosion behavior of hydraulic concrete under high-speed flow. Design/methodology/approach A high-speed and high-pressure venturi cavitation erosion generator was used to simulate the strong cavitation. The characteristics of hydrodynamic loads of cavitation bubble collapse zone, the failure characteristics and the erosion development process of concrete were investigated. The main influencing factors of cavitation erosion were discussed. Findings The collapse of the cavitation bubble group produced a high frequency, continuous and unsteady pulse load on the wall of concrete, which was more likely to cause fatigue failure of concrete materials. The cavitation action position and the main frequency of impact load were greatly affected by the downstream pressure. A power exponential relationship between cavitation load, cavitation erosion and flow speed was observed. With the increase of concrete strength, the degree of damage of cavitation erosion was approximately linearly reduced. Originality/value After cavitation erosion, a skeleton structure was formed by the accumulation of granular particles, and the relatively independent bulk structure of the surface differed from the flake structure formed after abrasion.

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