scholarly journals Effect of Chloride Diffusion on Corrosion Behavior of 304SS Steel in Simulated Concrete Solution under Carbonation Condition

2021 ◽  
pp. ArticleID:21095
Author(s):  
Senlin Li ◽  
Keyword(s):  
Corrosion Behavior ◽  
Chloride Diffusion ◽  
Concrete Solution

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%.

scholarly journals Corrosion behavior of HRB400 and HRB400M steel bars in concrete under DC interference

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Qingmiao Ding ◽  
Yuning Gao ◽  
Ruiyang Liu ◽  
Yaozhi Li ◽  
Lei Jin ◽  
...  
Keyword(s):  
Corrosion Product ◽  
Corrosion Behavior ◽  
Direct Current ◽  
Product Layer ◽  
Corrosion Products ◽  
Product Analysis ◽  
Experimental Conditions ◽  
Corrosion Product Layer ◽  
Steel Bars ◽  
Concrete Solution

AbstractThe influence of direct current interference on the corrosion behavior of HRB400 and HRB400M steel bars in simulated concrete solution was studied using methods such as weight loss experiment, electrochemical experiment, surface technology and product analysis. The research results showed that with the increase of DC interference voltage, the corrosion rates of HRB400 and HRB400M steel bars would increase. The corrosion resistance of HRB400M steel bars was better than HRB400 steel bars under the experimental conditions. In addition, direct current interference could cause damage to the corrosion product layer on the surface of HRB400 steel bars and HRB400M steel bars. And the corrosion form and corrosion product types of HRB400 and HRB400M steel bars would be affected by direct current interference. The main corrosion products of HRB400 steel bars included γ-FeOOH and Fe2O3 when it was not interfered by DC. When DC interference was applied, the main corrosion products included Fe3O4 and Fe2O3. The corrosion products on the surface of HRB400M steel bars were mainly Fe3O4 and Fe2O3, and the types of products increased to form Cr2O3 and MnFe2O4.

scholarly journals Effects of Transverse Crack on Chloride Ions Diffusion and Steel Bars Corrosion Behavior in Concrete under Electric Acceleration

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2481 ◽  
Author(s):  
Fengyin Du ◽  
Zuquan Jin ◽  
Chuansheng Xiong ◽  
Yong Yu ◽  
Junfeng Fan
Keyword(s):  
Transmission Coefficient ◽  
Corrosion Behavior ◽  
Crack Width ◽  
Steel Corrosion ◽  
Chloride Ion ◽  
Chloride Ions ◽  
Chloride Diffusion ◽  
Transverse Cracks ◽  
Steel Bars ◽  
Ion Transmission

Cracks greatly impact the durability of concrete structures due to their influence on the migration of chloride ions and the corrosion process of steel bars. This study investigates the effects of transverse cracks on chloride diffusion and the corrosion behavior of two types of steel bars (low carbon steel and corrosion resistant steel) in fly ash concrete with 1 kg/m3 solution-polymerized super absorbent polymer. Electrochemical impedance spectroscopy was used to monitor the chloride-induced corrosion behavior of steel bars in concrete. The chloride profile around cracks was tested via chemical titration. The corrosion products diffusion area was photographed and measured to evaluate the influences of cracks on the corrosion degree of steel bars. Transverse cracks greatly influence the chloride ion transport. When their width is less than 0.15 mm, cracks exert little influence on both chloride diffusion and steel corrosion. When the crack width exceeds 0.15 mm, the chloride ion transmission coefficient is significantly improved and steel corrosion is accelerated. However, when the crack width exceeds 0.20 mm, this effect is gradually weakened. Based on the experimental data, a quantitative relationship between the crack width and the chloride ion transmission coefficient in electric acceleration was established.

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%.

scholarly journals Electrochemical and microscopic analysis on corrosion behavior of steel bars in slag/fly ash-cement paste subjected to seawater attack

2021 ◽  
Vol 7 (2) ◽  
pp. 33-55
Author(s):  
Shuai Zou ◽  
◽  
Xiao-Nao Zuo ◽  
Xinagnan Li ◽  
Jianzhuang Xiao ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Reinforced Concrete ◽  
Fly Ash ◽  
Corrosion Behavior ◽  
Cement Paste ◽  
Marine Environment ◽  
Electrochemical Impedance ◽  
Physical Adsorption ◽  
Chloride Diffusion ◽  
Steel Bars

series of corrosion experiments of cement paste-steel bar specimens with different contents of slag and fly ash were performed to investigate the influence of slag/fly ash on the corrosion behavior of steel bars in concrete under seawater. In this investigation, the corrosion behavior of specimen was electrochemically monitored by open-circuit potential (OCP), Tafel polarization (TP) and electrochemical impedance spectra (EIS). Meanwhile, SEM/EDS and XRD were applied to microscopically analyze the microstructure deterioration of materials. Results showed that, replacing cement with slag/fly ash caused a decrease in Ca(OH)2 as well as an increase in C-S-H gel and Friedel's salt in concrete, which can improve the chloride-solidification ability and slow down the chloride diffusion in concrete by both physical adsorption and chemical binding, and thereafter promoting the corrosion resistance of steel bars in concrete in marine environment. Compared to slag, the equal replacing content of fly ash can contribute to a better improving effect on the corrosion resistance of reinforced concrete in marine environment. In this study, a replacement of cement by 20% slag+20% fly ash led to an optimum improving effect on its corrosion resistance. In addition, the results also indicate that the corrosion of reinforced concrete caused by seawater attack does not occur at a uniform rate, but it can firstly maintain a long-term uncorroded state, and then develops rapidly after pitting corrosion occurs.

Sem Studies of Co-Cr-Mo Surgical Implant Alloy Corrosion Behavior

1982 ◽  
Vol 40 ◽  
pp. 520-521
Author(s):  
Ann Chidester Van Orden ◽  
John L. Chidester ◽  
Anna C. Fraker ◽  
Pei Sung
Keyword(s):  
Electron Microscopy ◽  
Corrosion Behavior ◽  
Anodic Polarization ◽  
Saline Solution ◽  
Saturated Calomel Electrode ◽  
Physiological Saline ◽  
X Ray ◽  
Physiological Saline Solution ◽  
Scanning Electron

The influence of small variations in the composition on the corrosion behavior of Co-Cr-Mo alloys has been studied using scanning electron microscopy (SEM), energy dispersive x-ray analysis (EDX), and electrochemical measurements. SEM and EDX data were correlated with data from in vitro corrosion measurements involving repassivation and also potentiostatic anodic polarization measurements. Specimens studied included the four alloys shown in Table 1. Corrosion tests were conducted in Hanks' physiological saline solution which has a pH of 7.4 and was held at a temperature of 37°C. Specimens were mechanically polished to a surface finish with 0.05 µm A1203, then exposed to the solution and anodically polarized at a rate of 0.006 v/min. All voltages were measured vs. the saturated calomel electrode (s.c.e.).. Specimens had breakdown potentials near 0.47V vs. s.c.e.

CORROSION BEHAVIOR OF AMORPHOUS IRON-BASE ALLOYS

1980 ◽  
Vol 41 (C8) ◽  
pp. C8-862-C8-866
Author(s):  
M. Naka ◽  
K. Hashimoto ◽  
K. Asami ◽  
T. Masumoto
Keyword(s):  
Corrosion Behavior ◽  
Amorphous Iron ◽  
Iron Base

A Study on Impact Properties and Corrosion Behavior of Ni Added EH36 TMCP Steel

2013 ◽  
Vol 51 (1) ◽  
pp. 033-039
Author(s):  
Hae Woo Lee ◽  
Jae Hyeok Jeon ◽  
Ja Young Hong
Keyword(s):  
Corrosion Behavior ◽  
Impact Properties
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