scholarly journals Corrosion Behavior of GH4169 Alloy under Alternating Oxidation at 900 °C and Solution Immersion

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1503 ◽  
Author(s):  
Zhongfen Yu ◽  
Li Liu ◽  
Rui Liu ◽  
Min Cao ◽  
Lei Fan ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Oxide Film ◽  
Corrosion Behavior ◽  
Electron Probe ◽  
Mixed Oxides ◽  
Nacl Solution ◽  
Corrosion Scale ◽  
Composition And Structure ◽  
Gh4169 Superalloy ◽  
Gh4169 Alloy

In this paper, the corrosion behavior of GH4169 superalloy under alternating oxidation (at 900 °C) and solution immersion (in 3.5% NaCl solution, 30 ± 1 °C) has been studied by SEM, XRD, XPS, and electron probe microanalysis (EPMA). The results show that the alternating environment increases the corrosion rate of GH4169. The reaction of NaCl and Cr2O3 generates various volatile and soluble corrosion products, such as Na2Cr2O7, CrCl3, Cl2, and Na2CrO4, at a high temperature. The destruction of the protective Cr2O3 film leads to the increase of defects in the oxide scale, promoting the formation of oxides, such as NiO and Fe2O3, and changes the composition and structure of the oxide film. After repeated iterations, the mixed oxides will result in the spalling of the oxide film because they can reduce the fracture toughness of the corrosion scale. Therefore, the corrosion is comprehensively intensified.

Corrosion Behavior and Mechanical Properties of Reinforcing Bar HRB400 in NaCl Solution

2011 ◽  
Vol 418-420 ◽  
pp. 451-454
Author(s):  
Li Ping ◽  
Wang Ying
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Nacl Solution ◽  
Reinforcing Bar ◽  
Corrosion Scale ◽  
Before And After ◽  
Concrete Solution

The corrosion behavior of reinforcing bar HRB400 in simulated concrete solution (0.5 wt.% NaCl solution) was investigated, and its tensile mechanical properties were tested before and after corrosion. The results show that, with the increase of corrosion time from 240h to 720h, the corrosion rate increases and the corrosion becomes heavier and heavier, and the composition amounts of corrosion scale are similar. After 720h, the yield strength and tensile strength are decreased by less than 10%, and the elongation are decreased by more than 20%.

Effect of Sn on Corrosion Resistance of Mg-6Al-1.2Y-0.9Nd Alloy

2011 ◽  
Vol 117-119 ◽  
pp. 1334-1337 ◽  
Author(s):  
Hai Juan Kang ◽  
Quan An Li ◽  
Wei Zhou ◽  
Qing Zhang
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Scale Analysis ◽  
Nacl Solution ◽  
Corrosion Tests ◽  
Corrosion Scale ◽  
Static Corrosion

The effect of Sn addition on corrosion behavior of Mg-6Al-1.2Y-0.9Nd alloy in 3.5wt.% NaCl solution has been researched by static corrosion tests, corrosion morphologies observation, microstructure and corrosion scale analysis. The result shows that, with the content of Sn increasing, the corrosion rate decreases at first and then increases. When the addition of Sn is 1wt.%, the corrosion rate is the lowest and the corrosion resistance is improved obviously.

Corrosion Behavior of Reinforcing Steel Bar HPB235 in NaCl Solution

2011 ◽  
Vol 287-290 ◽  
pp. 738-741 ◽  
Author(s):  
Ying Wang ◽  
Ping Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Reinforcing Steel ◽  
Nacl Solution ◽  
Corrosion Scale ◽  
Steel Bar ◽  
Before And After

The corrosion behavior of reinforcing steel bar HPB235 in concrete structure in 0.5% NaCl solution was investigated and its mechanical properties were tested before and after corrosion. The results showed that, with corrosion time increasing from 240h to 720h, the corrosion rate increases and the corrosion becomes heavier and heavier, but the corrosion scale is not changed obviously in compositions. After 720h, the yield strength is decreased by less than 5%, but the tensile strength and the elongation are decreased by more than 10%.

Effect of Chloride on Corrosion Behavior of Reinforcing Steel HRB335

2011 ◽  
Vol 391-392 ◽  
pp. 1342-1345
Author(s):  
Ping Li ◽  
Ying Wang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Reinforcing Steel ◽  
Nacl Solution ◽  
Corrosion Scale ◽  
Before And After ◽  
Concrete Solution

The corrosion behavior of reinforcing steel HRB335 in structure in simulated concrete solution (0.5 wt.% NaCl solution) was investigated, and its tensile mechanical properties were tested before and after corrosion. The results show that, with the increase of corrosion time from 240h to 720h, the corrosion rate increases and the corrosion becomes heavier and heavier, and the composition amounts of corrosion scale are not familiar. After 720h, the yield strength is decreased by about 3%, and the tensile strength and the elongation are decreased by more than 4%.

Effect of Sealing Treatments on the Corrosion Behavior of Micro-arc Oxidation Coating on Aluminum Alloy in Acid NaCl Solution

2015 ◽  
Vol 30 (6) ◽  
pp. 627
Author(s):  
YE Zuo-Yan ◽  
LIU Dao-Xin ◽  
LI Chong-Yang ◽  
ZHANG Xiao-Hua ◽  
ZANG Xiao-Ming ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Nacl Solution ◽  
Micro Arc Oxidation

scholarly journals Corrosion Behavior of Chemical Oxidation Film of Magnesium Alloy in NaCl Solution

2021 ◽  
Vol 719 (2) ◽  
pp. 022092
Author(s):  
De Cheng ◽  
Chen Wen ◽  
Jingying Bai ◽  
Yeshen Qin ◽  
Baocheng Jiao
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Chemical Oxidation ◽  
Nacl Solution

Corrosion behavior of cold-rolled and post heat-treated 316L stainless steel in 0.9wt% NaCl solution

2021 ◽  
Vol 28 (3) ◽  
pp. 440-449
Author(s):  
K. Bin Tayyab ◽  
A. Farooq ◽  
A. Ahmed Alvi ◽  
A. Basit Nadeem ◽  
K. M. Deen
Keyword(s):  
Stainless Steel ◽  
Corrosion Behavior ◽  
316L Stainless Steel ◽  
Nacl Solution ◽  
Heat Treated ◽  
Cold Rolled

Corrosion Behavior of a Selective Laser Melted Inconel 718 Alloy in a 3.5 wt.% NaCl Solution

2021 ◽  
Author(s):  
Yanbing Tang ◽  
Xinwang Shen ◽  
Yanxin Qiao ◽  
Lanlan Yang ◽  
Jian Chen ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Inconel 718 ◽  
Nacl Solution ◽  
Inconel 718 Alloy

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.

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