scholarly journals Corrosion of N10276 in a H2S, HCl, and CO2 Containing Atmosphere at 480 °C and 680 °C

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1817
Author(s):  
Manuela Nimmervoll ◽  
Gregor Mori ◽  
Edith Bucher ◽  
Alexander Schmid ◽  
Roland Haubner
Keyword(s):  
Corrosion Behavior ◽  
Metallic Materials ◽  
Alloying Element ◽  
Ni Alloys ◽  
Gas Atmosphere ◽  
Element Bearing ◽  
Anthropogenic Resources ◽  
Kinetic Effects ◽  
The Impact ◽  
Iron Chromium

In several industrial processes, metallic materials suffer from chlorine- and sulfur-induced high-temperature corrosion. In previous studies, several steels have been tested at laboratory scale in a simulated gas atmosphere of a pyrolysis process of anthropogenic resources. In this paper, we propose a model on the course of corrosion in a H2S and HCl-containing atmosphere for N10276, which contains, besides iron, chromium, and nickel, also molybdenum as main alloying element. Bearing in mind the impact of the main alloying elements, as well as thermodynamic considerations and kinetic effects, the corrosion behavior of N10276 in a H2S and HCl-containing atmosphere at 480 °C and 680 °C can be explained. In addition, the corrosion behavior of N10276 is compared with earlier tested Fe-Cr-Ni alloys and differences in the corrosion behavior are stated within this paper.

Effect of Zn Content on Structure, Roughness and Corrosion Behavior of Zn-Ni Alloys

2019 ◽  
Vol 17 (17) ◽  
pp. 17-22
Author(s):  
Hayette Faid
Keyword(s):  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Stripping Voltammetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ni Alloys ◽  
Sulfate Bath ◽  
Zn Content ◽  
Polarization Test ◽  
Δ Phase

AbstractIn this work, Zn-Ni alloys have been deposited on steel from sulfate bath, by electrodeposition method. The effect of Zn content on deposits properties was studied by cyclic voltammetry (CV), chronoaperometry (CA), linear stripping voltammetry (ALSV) and diffraction (XRD) and scanning electronic microscopy (SEM). The corrosion behavior in 3.5 wt. NaCl solution was examined using anodic polarization test and electrochemical impedance spectroscopy. X-ray diffraction of show that Zn-Ni alloys structure is composed of δ phase and γ phase, which increase with the decrease of Zn content in deposits. Results show that deposits obtained from bath less Zn2+ concentration exhibited better corrosion resistance.

Influence of grain refinement on the corrosion behavior of metallic materials: A review

2021 ◽  
Vol 28 (7) ◽  
pp. 1112-1126
Author(s):  
Pan-jun Wang ◽  
Ling-wei Ma ◽  
Xue-qun Cheng ◽  
Xiao-gang Li
Keyword(s):  
Grain Refinement ◽  
Corrosion Behavior ◽  
Metallic Materials

LMFBR Steam Generator Materials Development at Westinghouse

1983 ◽  
Vol 105 (4) ◽  
pp. 719-725 ◽  
Author(s):  
M. A. Hebbar ◽  
C. E. Sessions
Keyword(s):  
Water Chemistry ◽  
Corrosion Behavior ◽  
Tube Model ◽  
Expansion Joint ◽  
Chemical Cleaning ◽  
Materials Development ◽  
The Past ◽  
Component Design ◽  
The Impact ◽  
Double Wall

The impact of Materials and Processes (M and P) development activities at the Nuclear Components Division - Breeder Reactor Components Project of Westinghouse are described. Nine specific M and P programs have been performed over the past five years and the conclusions drawn from each are summarized herein. These engineering activities could be classified as component design, fabrication, and testing results. However, the discussion presented is from a materials engineer’s viewpoint as to how the previously proposed development tasks have answered existing questions about either design, manufacturing, or plant operation. The nine areas which are discussed include (i) double-wall tubing, (ii) tube-to-tubesheet welding, (iii) few tube model fabrication and testing, (iv) tube support plates, (v) shell welding, (vi) convoluted shell expansion joint, (vii) water chemistry and corrosion behavior, (viii) chemical cleaning, and (ix) surface contamination protection.

THE EFFECT OF IMMERSION TIME ON THE CORROSION BEHAVIOR OF SUS304 IN BRINE USING HALF-CELL POTENTIAL MEASUREMENT

2016 ◽  
Vol 78 (6-9) ◽  
Author(s):  
Saber Rashid ◽  
N. Islami ◽  
A. K. Ariffin ◽  
M. Ridha ◽  
S. Fonna
Keyword(s):  
Stress Corrosion ◽  
Corrosion Behavior ◽  
Immersion Time ◽  
Plastic Anisotropy ◽  
Internal Stresses ◽  
Half Cell ◽  
Cell Potential ◽  
Potential Measurement ◽  
G 38 ◽  
The Impact

The aim of this study is to investigate the impact of immersion time, at different time values for two cases, with stressed and no stressed on materials. This study is conducted using SUS304 material with the presence of 3.5% NaCl at the range of stresses for the specimens lower than the yield strength.  The geometry of the C-ring specimen was selected for 18.974 mm and 1.244 mm for the outer diameters and the thickness respectively. The immersion time effect was investigated using the half-cell potential measurement following the ASTM G-38 standard. The approach of corrosion environment was applied to resemble the condition of loading history. Three levels of stresses were designed and applied in finite element analysis and the results known as the parameters of stress-corrosion measurement. The ASTM G-38 standard is prominent for making C-ring stress-corrosion for elastic stress analysis. The stress-corrosion test was performed at two parameters, fixed stress and no stress. The value of stresses for fixed stress was chosen for 179.199 MPa, 328.665 MPa and 460.131 MPa, correspondingly. The immersion time were selected from 0, 10 and 30 days. The electrochemical result shows that the immersion time did not affect vastly to the corrosion behavior for no stress-corrosion compared with fixed stress. The corrosion rate increases proportionally with the time immersion increments due to the inability of the steel layer protection to regenerate itself. Subsequently, it is also due to the metal was exposed to plastic deformation that resulting the internal stresses due to the plastic anisotropy of the grains.

The impact of Ni on the corrosion behavior and microstructure of weld metal fabricated from E8018-G electrodes

2020 ◽  
Vol 64 (6) ◽  
pp. 1065-1075
Author(s):  
Majid Fakheri ◽  
Hamid R. Zare ◽  
Zahra Mohammadpour ◽  
Masoud Mosallaee
Keyword(s):  
Weld Metal ◽  
Corrosion Behavior ◽  
The Impact

Corrosion Issues of HTR Structural Metallic Materials

2008 ◽  
Author(s):  
Celine Cabet ◽  
Brigitte Duprey ◽  
Gouenou Girardin ◽  
Annie Page`s ◽  
Martine Blat
Keyword(s):  
High Temperature ◽  
Corrosion Behavior ◽  
Gas Flow ◽  
Material Selection ◽  
Specimen Preparation ◽  
Residual Water ◽  
Metallic Materials ◽  
Preparation Temperature ◽  
Benchmark Test ◽  
Temperature Oxidation

Within the framework of the ANTARES program, AREVA NP, EDF and the CEA have launched a joint R&D program on metallic materials for VHTR. Reference alloys for circuit and Intermediate Heat eXchanger (IHX) are nickel-based with about 22%wt. of chromium. Compatibility with the HTR primary helium appears to be a determining property for the material selection and qualification. The coolant is actually polluted by a low level of impurities that can interact with metals at high temperature. Oxidation, carburization and/or decarburization occur, in relation to atmosphere characteristics, temperature and alloy chemical composition. As these corrosion effects can notably influence the mechanical properties, they often are determining to the component service life. Since the corrosion behavior is highly sensitive to environmental conditions, material studies require dedicated facilities that shall allow for a strict control of the environment throughout the entire specimen exposure. AREVA NP, CEA, and EDF have developed experimental loops respectively under the names the Chemistry Loop, CORINTH and CORALLINE, ESTEREL; these high temperature helium flow systems are equipped with high accuracy hygrometers and gas analyzers. A benchmark was defined to cross-validate the lab devices and procedures. It is composed of two tests. The joint protocol sets the operating parameters in terms of material, specimen preparation, temperature and heating program, gas pressure and flow rate, time, gas composition. Corrosion is assessed by mass change associated to observations and analyses of the corroded coupons considering the surface scales (nature, morphology and thickness), the internal oxidation (nature, distribution and depth) and the possible carburization/decarburization (type and depth). For benchmark test 1, AREVA NP, CEA, and EDF produced similar results in terms of operation of the tests as well as about the corrosion criteria. On the other hand, benchmark test 2 showed a difference in the residual water vapor level between loops that was shown to strongly influence the specimen behavior. Discrepancies in the alloy corrosion were studied regarding gas flow rates and effective oxygen potential in helium. As a consequence, the experimental tools and procedures have been upgraded. French laboratories have now efficient corrosion facilities and methods at their disposal to study and qualify the corrosion behavior of structural materials in HTR environment.

scholarly journals Electrochemical Investigation of Corrosion Behavior of Epoxy Modified Silicate Zinc-Rich Coatings in 3.5% NaCl Solution

Coatings ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 444
Author(s):  
Jingtao Wang ◽  
Yuhong Qi ◽  
Xu Zhao ◽  
Zhanping Zhang
Keyword(s):  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Solid Content ◽  
Shipping Industry ◽  
Nacl Solution ◽  
Corrosive Media ◽  
Pencil Hardness ◽  
Anticorrosive Coatings ◽  
The Impact ◽  
Epoxy Content

In order to develop waterborne silicate anticorrosive coatings to replace solvent-based anticorrosive coatings used widely in the shipping industry, epoxy modified silicate emulsions were synthesized with different contents of epoxy resin, then aqueous silicate zinc-rich coatings were prepared with the synthesized silicate emulsion, triethylamine, and zinc powder. The influence of the content of epoxy on the properties and chemical structure of the modified emulsion, mechanical properties of the silicate coatings, and corrosion behavior of the silicate zinc-rich coatings in 3.5% NaCl solution were investigated. The coating samples on steel were measured by the immersion test, Tafel polarization test, and electrochemical impedance spectroscopy (EIS) test with different immersion times. The results showed that epoxy modified silicate emulsions were successfully synthesized. With the increase in epoxy content, the viscosity and solid content of the modified emulsion increased, the impact resistance of the silicate coating rose, the pencil hardness decreased, but the adhesion was not affected. Epoxy modification can reduce, to a certain extent, the corrosion driving force of the zinc rich coating and increase the impedance of the zinc-rich coating, which decreases with the increase of immersion time in 3.5% NaCl solution. With the increase in the epoxy content, the impedance value of the zinc-rich coating increases, indicating that the ability of the coating to resist corrosive media is enhanced.

Fatigue Properties of Superelastic Ti-Ni Filaments Used in Braided Cables for Bone Fixation

2008 ◽  
Vol 57 ◽  
pp. 235-240 ◽  
Author(s):  
Yannick Baril ◽  
Vladimir Brailovski ◽  
Patrick Terriault
Keyword(s):  
Fatigue Life ◽  
Strain Range ◽  
Fatigue Properties ◽  
Cyclic Testing ◽  
Testing Conditions ◽  
Bone Fixation ◽  
Ni Alloys ◽  
Strain Magnitude ◽  
The Impact ◽  
Mean Strain

Superelastic 0.1mm diameter Ti-Ni filaments are used to manufacture braided orthopedic cable for bone fixation. Biomechanical conditions for this application generally have a cyclic nature, and therefore it becomes important to evaluate the influence of the installation (mean) strain on the fatigue life of these filaments. Uniaxial tension cyclic testing of Ti-Ni filaments is performed in a water bath at 37°C with a 2Hz frequency of to 100 000 cycles. Strain-controlled testing conditions are as follows: alternating strain magnitude varies between 0.64 and 3.64% with mean strain range between 1.32 and 7.1%. Based on the premises that the minimum strain should be high enough to prevent any loss of tension in the tested specimen and that the maximum strain should not bring the specimen to failure during the first loading cycle, the total strain magnitude is encompassed between 0.68 and 8.94%. The results obtained provide a better understanding of the impact mean strain has on the fatigue life of superelastic Ti-Ni alloys.

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