Environmental corrosion behavior and accelerated corrosion verification of metal part

2021 ◽  
Author(s):  
Xin Wang ◽  
Shujie Xu ◽  
Jiayu Wang ◽  
Kaixu Ren ◽  
Peng Liu
Keyword(s):  
Corrosion Behavior ◽  
Metal Part ◽  
Accelerated Corrosion

Flow-accelerated corrosion behavior of 13Cr stainless steel in a wet gas environment containing CO2

2018 ◽  
Vol 25 (7) ◽  
pp. 779-787 ◽  
Author(s):  
Yong Li ◽  
Min-dong Chen ◽  
Jian-kuan Li ◽  
Long-fei Song ◽  
Xin Zhang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Behavior ◽  
Accelerated Corrosion ◽  
Wet Gas ◽  
Gas Environment ◽  
Flow Accelerated Corrosion

Accelerated corrosion behavior of weathering steel Q345qDNH for bridge in industrial atmosphere

2021 ◽  
Vol 306 ◽  
pp. 124864
Author(s):  
Jun-dong Fu ◽  
Shui Wan ◽  
Ying Yang ◽  
Qiang Su ◽  
Wen-wen Han ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Weathering Steel ◽  
Accelerated Corrosion ◽  
Industrial Atmosphere

Effects of Stress on Pitting Corrosion Behavior of Low-Carbon Steel

2013 ◽  
Author(s):  
Huaixiang Cao ◽  
Hao Zhang ◽  
Xingqi Qiu
Keyword(s):  
Carbon Steel ◽  
Corrosion Behavior ◽  
Pitting Corrosion ◽  
High Stress ◽  
Low Carbon Steel ◽  
Pressure Vessels ◽  
Structural Safety ◽  
Low Carbon ◽  
Corrosion Morphology ◽  
Accelerated Corrosion

Low-carbon steel Q235B was widely used in low or middle pressure equipments, which were not only withstanding the corrosive effect of the environment or medium, but also the high stress in service processes. In this paper, acetic acid accelerated corrosion test of low-carbon steel Q235B under the action of various stress levels was conducted, and its pitting corrosion behavior was studied by corrosion morphology, pitting corrosion parameters, scanning electron microscope (SEM) and energy disperse spectroscopy (EDS). The results showed that, the degree of pitting corrosion of low carbon steel Q235B with stress was more serious than that of non-stress. And the corrosion started from grain boundary, which was corroded before grain itself, and then grains fell off or dissolved. Furthermore, it would have the tendency of deep hole corrosion with stress, which was more of a threat to the structural safety of pressure vessels.

Effect of Temperature and Composition on Corrosion Behavior of Medium Cr Steel in Salt Solution Containing CO<sub>2</sub>

CORROSION ◽  
10.5006/3686 ◽  
2021 ◽  
Author(s):  
Yang Gu ◽  
Huibin Wu ◽  
Rui Yuan ◽  
Pengcheng Zhang ◽  
zhihui zhang ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Resistance Mechanism ◽  
Local Corrosion ◽  
Effect Of Temperature ◽  
General Corrosion ◽  
Uniform Corrosion ◽  
Accelerated Corrosion ◽  
Volta Potential ◽  
Product Film ◽  
The Matrix

In this paper, the corrosion behavior of three kinds of medium Cr low C steels in the simulated service environment of the transport pipeline was investigated through accelerated corrosion experiments, and the corrosion resistance mechanism of these experimental steels at different temperatures was investigated by electrochemical means. Finally, the reasons for the difference in corrosion behavior were analyzed from the grain boundary and surface Volta potential. The results show that as the temperature rised, the corrosion rate of 5Cr specimens increased sharply, the corrosion type developed from slight general corrosion to severe general corrosion; 7Cr specimen was less sensitive to temperature, and the type of corrosion changed from slight general corrosion to local corrosion; 9Cr specimen was not sensitive to temperature, and the type of corrosion was always local corrosion. 5Cr steel could form a protective product film at 30 °C. As the temperature rised, the protective ability of the product film decreased, and the matrix dissolved easily. The film of 7Cr and 9Cr samples had not yet precipitated and the matrix was difficult to dissolve at 30 °C. However the matrix dissolved easily at 50 °C, and the product film had formed, which played a major role. At 70 °C, the protective effect of the product film decreased, and the gap between the 7Cr and 9Cr samples began to appear. The increase of Cr content helped to refine grains and increased the proportion of low-angle grain boundaries. At the same time, the increase of Cr element helped to increase the maximum Volta potential of the experimental steel and increased the Volta potential difference. As a result the test steel was shown to be resistant to uniform corrosion, but it also increased the risk of pitting corrosion.

scholarly journals Corrosion Behavior Evaluation of Coated Steel Using Fiber Bragg Grating Sensors

Coatings ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 55 ◽  
Author(s):  
Fodan Deng ◽  
Ying Huang ◽  
Fardad Azarmi
Keyword(s):  
Real Time ◽  
Corrosion Behavior ◽  
Electrochemical Corrosion ◽  
Hard Coatings ◽  
Coated Steel ◽  
Accelerated Corrosion ◽  
Accelerated Corrosion Tests ◽  
Sensing Platform ◽  
Assessment Approach ◽  
Good Agreement

Coatings, either soft or hard, are commonly used to protect steel against corrosion for longer service life. With coatings, assessing the corrosion behavior and status of the substrate is challenging without destructive analysis. In this paper, fiber Bragg (FBG) grating sensors were proposed to nondestructively evaluate the corrosion behavior of steel coated with two popular coatings, including the polymeric and wire arc sprayed Al-Zn coating. Laboratory accelerated corrosion tests demonstrated that the embedded FBG sensors inside both the soft and hard coatings can effectively quantify the corrosion rate, monitor the corrosion progress, and detect the coating damages and crack propagation of coated steel in real time. The laboratory electrochemical corrosion test on the wire arc sprayed Al-Zn coating validated the proposed embedded FBG sensor method with a good agreement in comparison. The proposed sensing platform provides an alternative nondestructive real-time corrosion assessment approach for coated steel in the field.

Black Layers on Aluminum Substrate – Evaluation of Corrosion Behavior

2008 ◽  
Vol 38 ◽  
pp. 36-47 ◽  
Author(s):  
L. Anicai ◽  
A. Pertache ◽  
M. Buda ◽  
T. Visan
Keyword(s):  
Corrosion Behavior ◽  
Open Circuit ◽  
Impedance Spectra ◽  
Cathodic Deposition ◽  
Throwing Power ◽  
Solar Absorption ◽  
Accelerated Corrosion ◽  
Polypyrrole Films ◽  
Accelerated Corrosion Tests ◽  
Black Coating

The paper presents some preliminary experimental results dealing with electrochemical synthesis and corrosion behavior of various black layers types onto Al substrates, suitable to be used as selective absorber coatings in the case of thermal energy production from solar energy, involving several different procedures, respectively: (i) electrodeposition of black Ni-Mo alloy after an initial anodizing in nitric acid electrolyte that offers a very good adherence of the further applied coatings; (ii) cathodic deposition of black Mo based layers after an initial double zincating procedure; (iii) black coatings through a.c. electrochemical coloring of aluminum anodic oxides, using AgNO3/H2SO4, NiSO4 based solutions; (iv) black composite polypyrrole films. The obtained black layers are characterized by a good throwing power, homogeneity, smoothness and adherence, as shown by SEM and AFM investigations. Also, they present a good solar absorption and low values of infrared emittance. To evaluate the resistance of black coating layers against corrosion, several accelerated corrosion tests have been performed, respectively: (i) continuous immersion in 0.5M NaCl for 408 hours with intermediary visual examinations and recording of corrosion potential; (ii) potentiodynamic polarization curves in 0.5M NaCl; (iii) impedance spectra in 0.5M NaCl at open circuit potential using a Zahner IM6e potentiostatic equipment. The corrosion performances are discussed taking into account the applied preparation procedures.

Zirconium Alloy Corrosion In High-Temperature Halide Solutions

CORROSION ◽  
1963 ◽  
Vol 19 (7) ◽  
pp. 253t-259t ◽  
Author(s):  
W. E. BERRY ◽  
E. L. WHITE ◽  
W. FINK
Keyword(s):  
High Temperature ◽  
Corrosion Behavior ◽  
Zirconium Alloy ◽  
Fluoride Concentration ◽  
Severe Attack ◽  
Accelerated Corrosion

Abstract The corrosion behavior of Zircaloy-4 has been studied in 680 F halide solutions adjusted to pH 10.5 with LiOH or NH4OH. No accelerated corrosion was observed after 56 days' exposure to 0.01 M solutions of LiCI, Lil, NH4Cl or NH4l, with or without Fe3O4 suspensions in the solutions. Severe attack occurred in Fe3O4-free 0.01 M LiF and NH4F solutions. Although large quantities of Fe3O4 in suspension decreased attack by decreasing the fluoride concentration of the solution, thin surface deposits of Fe3O4 on the Zircaloy-4 surface did not appear to increase or retard attack in the 0.01 M fluoride solutions. No unusual corrosion occurred in 0.001 M LiF or 0.0001 M NH4F solutions.

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