Comparative Analysis on Corrosion Behavior of 316SS and 304SS in Subcritical and Supercritical Aqueous Systems

2018 ◽  
Vol 777 ◽  
pp. 381-385
Author(s):  
Tong Tong Xu ◽  
Yan Hui Li
Keyword(s):  
Corrosion Resistance ◽  
Comparative Analysis ◽  
Corrosion Behavior ◽  
Chromium Concentration ◽  
Corrosion Products ◽  
Local Corrosion ◽  
Aqueous Systems ◽  
Industrial Sludge ◽  
Clay Materials

The corrosion characteristics of 316SS and 304SS in subcritical and supercritical aqueous systems including chloride of approximate 4600 mg/L at 25 MPa and 250 °C, 350 °C, 425 °C, and 520 °C are comparatively investigated. Some local corrosion areas occurred on the surfaces of SS316, not on that of 304SS, at 250 °C and 425 °C, while at 350 °C, all the sample surfaces were covered by large amounts of corrosion products and clay materials due to the predominant precipitation for the formation of the outer subscale. Whether in reducing subcritical and supercritical industrial sludge suspension or in oxidizing supercritical sludge system, 304SS owns better corrosion resistance than 316SS due to higher chromium concentration of former.

Improving Corrosion Resistance of Hot Extruded Mg-Sn-Al-Ce Magnesium Alloy by Rapid Solidification

2017 ◽  
Vol 904 ◽  
pp. 80-84 ◽  
Author(s):  
Peng Cheng ◽  
Yun Gui Chen ◽  
Wu Cheng Ding
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Rapid Solidification ◽  
Corrosion Behavior ◽  
Corrosion Products ◽  
Uniform Particles

The corrosion behavior and microstructure of hot extruded Mg-5 wt.%Sn-4 wt.%Al-2 wt.%Ce alloy by rapid solidification ribbon (RS-EX TAE542) are investigated. The results shows that corrosion resistance of RS-EX alloy is remarkably improved, compared with that of hot extruded TAE542 alloy by homogenized ingot (HI-EX TAE542). Relatively compact corrosion products and bedded corrosion surface of RS-EX alloy is connected with the fine grains and uniform particles caused by rapid solidification, and they can suppress the corrosion reactions.

scholarly journals Effect of YAl2 Particles on the Corrosion Behavior of Mg–Li Matrix Composite in NaCl Solution

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 549 ◽  
Author(s):  
Zihan Chen ◽  
Chonggao Bao ◽  
Guoqing Wu ◽  
Yongxin Jian ◽  
Li Zhang
Keyword(s):  
Corrosion Resistance ◽  
Intermetallic Compound ◽  
Corrosion Behavior ◽  
Matrix Composite ◽  
Surface Film ◽  
Interface Layer ◽  
Corrosion Products ◽  
Nacl Solution ◽  
The Stability ◽  
Main Factor

The strength of Mg–Li alloy is greatly improved by the composite strengthening of intermetallic compound YAl2 particles, but the low corrosion resistance of Mg–Li alloy is still the main factor that restricts the application of the alloy and its composites. In this paper, the effect of YAl2 particles on the corrosion behavior of Mg–Li alloy was systematically investigated. The results showed that the corrosion resistance of YAl2p/LA143 composite could be significantly improved, accounting for the formation of a transitional interface layer by adding YAl2 particles. The diffusion of yttrium and aluminum atoms from YAl2 particulates improved the stability of the surface film and enhanced the adhesion between the corrosion products and the substrate, which hindered further expansion of pitting.

Study on Corrosion Resistance of Cr-Containing P110 Steel

2013 ◽  
Vol 740 ◽  
pp. 608-611 ◽  
Author(s):  
Ming Hua Liang ◽  
Zhi Yong Pan ◽  
Xiang Zhang
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Product ◽  
Corrosion Behavior ◽  
Local Corrosion ◽  
Effect Of Temperature ◽  
Corrosion Rates ◽  
P110 Steel ◽  
Better Than

The influence of Cr on corrosion behavior of P110 steel was studied in the simulated CO2 environment. The result demonstrated that the Cr cant change the effect of temperature on P110 steel. The corrosion rates of the two kinds of materials reached the peak at 90°C. The temperature has dual effects on corrosion, which caused the adhesive and productivity of corrosion product formed up 90°C are better than that formed below 90°C; The adding of Cr in the P110 steel can prohibit the local corrosion to occur.

scholarly journals Corrosion Behavior of Corrosion-Resistant Spring Steel Used in High Speed Railway

2021 ◽  
Vol 11 (18) ◽  
pp. 8668
Author(s):  
Jinbo Li ◽  
Ziying Zhu ◽  
Hongwei Chen ◽  
Shaojie Li ◽  
Hongyan Wu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
High Speed ◽  
Corrosion Potential ◽  
Early Stage ◽  
Corrosion Current ◽  
Corrosion Products ◽  
Atmospheric Environment ◽  
Rust Layer ◽  
Experimental Steel

Corrosion behavior of 60Si2Mn-A and 60Si2Mn-B in simulated industrial atmospheric environment was investigated by alternate immersion corrosion test and electrochemical method. The phase, morphology, characteristics of corrosion products, and the distribution of Cr, Cu, and Ni in the corrosion products of experimental steel were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe microanalyzer (EPMA). The results show that the phase of rust layer is Fe3O4 and γ-FeOOH in the early stage and then changes to α-FeOOH and γ-FeOOH in the later stage; the size of the rust layer with corrosion resistance of 60Si2Mn is less than 60Si2Mn; the Cr element accumulates in the rust layer of the experimental steel in the early stage of corrosion resistance; and Cu, Ni, and Cr in the corrosion resistance 60Si2Mn are concentrated in the rust layer near the substrate In the later stage of corrosion. As the corrosion cycle is prolonged, the corrosion potential and the resistance of the rust layer of the experimental steel increases, and the corrosion current decreases; in the same corrosion cycle, the corrosion potential and corrosion resistance of 60Si2Mn-B are greater than 60Si2Mn, and the corrosion current is less than 60Si2Mn.

The Corrosion Behaviors of the Cerium Conversion Coatings on the Zinc Coating in a 5 % NaCl Solution

2017 ◽  
Vol 36 (1) ◽  
pp. 45-53 ◽  
Author(s):  
Jianghong Zhang ◽  
Binfang Meng ◽  
Xinying Wang ◽  
Wei Li
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Zinc Coating ◽  
Conversion Coating ◽  
Corrosion Products ◽  
Nacl Solution ◽  
Cerium Content ◽  
Electrochemical Parameters ◽  
Corrosion Behaviors ◽  
The Impact

AbstractThe present paper investigated the impact of cerium on the corrosion resistance of zinc coating in a 5 % NaCl solution. Electrochemistry was used to measure the electrochemical parameters to compare the corrosion resistance of the zinc coating with that of the cerium conversion coating on the galvanized layer. SEM/EDS and XRD were adopted to analyze the appearance and phases of corrosion products of the cerium conversion coating and to probe the impact of cerium on the corrosion behavior of zinc coating in the Cl–media. The results showed that the cerium conversion coating formed on the zinc coating increased the zinc’s corrosion resistance effectively, conversion coating with lower cerium content protected the substrate poorly, resulting in easy erosion of the zinc coating in the Cl–media. The corrosion products mainly consist of complexes, such as Zn(OH)xClyand Ce(OH)xCly.

scholarly journals The Influence of Rapid Solidification on Corrosion Behavior of Mg60Zn20Yb15.7Ca2.6Sr1.7 Alloy for Medical Applications

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5703
Author(s):  
Katarzyna Młynarek-Żak ◽  
Anna Sypien ◽  
Tomasz Czeppe ◽  
Anna Bajorek ◽  
Aneta Kania ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Cooling Rate ◽  
Corrosion Behavior ◽  
Photoelectron Spectroscopy ◽  
Open Circuit ◽  
Corrosion Products ◽  
Medical Applications ◽  
Scanning Calorimetry ◽  
X Ray ◽  
The Impact

Biodegradable magnesium alloys with Zn, Yb, Ca and Sr additions are potential materials with increased corrosion resistance in physiological fluids that ensure a controlled resorption process in the human body. This article presents the influence of the use of a high cooling rate on the corrosion behavior of Mg60Zn20Yb15.7Ca2.6Sr1.7 alloy proposed for medical applications. The microstructure of the alloy in a form of high-pressure die-casted plates was presented using scanning electron microscopy in the backscattered electrons (BSEs) mode with energy-dispersive X-ray spectrometer (EDX) qualitative analysis of chemical composition. The crystallization mechanism and thermal properties were described on the basis of differential scanning calorimetry (DSC) results. The corrosion behavior of Mg60Zn20Yb15.7Ca2.6Sr1.7 alloy was analyzed by electrochemical studies with open circuit potential (EOCP) measurements and polarization tests. Moreover, light microscopy and X-ray photoelectron spectroscopy were used to characterize the corrosion products formed on the surface of studied samples. On the basis of the results, the influence of the cooling rate on the improvement in the corrosion resistance was proved. The presented studies are novel and important from the point of view of the impact of the technology of biodegradable materials on corrosion products that come into direct contact with the tissue environment.

Corrosion of Fe3Al-4Cr Alloys at 1000°C in N2-0.1%H2S Gas

2018 ◽  
Vol 765 ◽  
pp. 173-177 ◽  
Author(s):  
Yu Ke Shi ◽  
Dong Bok Lee
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Xrd Analysis ◽  
Al Alloys ◽  
Corrosion Products ◽  
Al Alloy ◽  
Oxide Scales ◽  
Mixed Gas ◽  
Corrosion Rates

Pure Fe3Al and Fe3Al+4%Cr alloys were corroded at 1000 °C for up to 200 h in N2-0.1%H2S-mixed gas in order to study their corrosion behavior in H2S-containing atmosphere. The formed scales consisted primarily of α-Al2O3, FeAl2O4, and Fe2O3. In these oxide scales, hydrogen and sulfur dissolved according to the reaction; H2S→2H+S. Corrosion products of Cr were not identified in the scales from the XRD analysis, indicating that Cr dissolved in the oxide scales. Fe3Al+4%Cr alloy displayed poorer corrosion resistance than Fe3Al alloy, indicating that chromium accelerated the corrosion rates of Fe3Al alloys.

scholarly journals Comparative Study of the Structure, Properties, and Corrosion Behavior of Sr-Containing Biocoatings on Mg0.8Ca

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1942 ◽  
Author(s):  
Mariya B. Sedelnikova ◽  
Yurii P. Sharkeev ◽  
Tatiana V. Tolkacheva ◽  
Margarita A. Khimich ◽  
Olga V. Bakina ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Corrosion Resistance ◽  
Comparative Analysis ◽  
Cell Viability ◽  
Corrosion Behavior ◽  
Current Density ◽  
Tricalcium Phosphate ◽  
Average Content ◽  
Structure Properties

A comparative analysis of the structure, properties and the corrosion behavior of the micro-arc coatings based on Sr-substituted hydroxyapatite (Sr-HA) and Sr-substituted tricalcium phosphate (Sr-TCP) deposited on Mg0.8Ca alloy substrates was performed. The current density during the formation of the Sr-HA coatings was higher than that for the Sr-TCP coatings. As a result, the Sr-HA coatings were thicker and had a greater surface roughness Ra than the Sr-TCP coatings. In addition, pore sizes of the Sr-HA were almost two times larger. The ratio (Ca + Sr + Mg)/P were equal 1.64 and 1.47 for Sr-HA and Sr-TCP coatings, respectively. Thus, it can be assumed that the composition of Sr-HA and Sr-TCP coatings was predominantly presented by (Sr,Mg)-substituted hydroxyapatite and (Sr,Mg)-substituted tricalcium phosphate. However, the average content of Sr was approximately the same for both types of the coatings and was equal to 1.8 at.%. The Sr-HA coatings were less soluble and had higher corrosion resistance than the Sr-TCP coatings. Cytotoxic tests in vitro demonstrated a higher cell viability after cultivation with extracts of the Sr-HA coatings.

Corrosion of Valve Steels in Combustion Gases of Diesel Engines under Thermal Shock Conditions

2012 ◽  
Vol 323-325 ◽  
pp. 327-332 ◽  
Author(s):  
Zbigniew Grzesik ◽  
Krzysztof Adamaszek ◽  
Zbigniew Jurasz ◽  
S. Mrowec
Keyword(s):  
Corrosion Resistance ◽  
Thermal Shock ◽  
Corrosion Behavior ◽  
Diesel Engines ◽  
Chromium Concentration ◽  
Fuel Oil ◽  
Chromia Scale ◽  
Combustion Gases ◽  
Better Than ◽  
Component Addition

The corrosion behavior of four valve steels (X33CrNiMn23-8, X50CrMnNiNbN21-9, X53CrMnNiN20-8 and X55CrMnNiN20-8) in combustion gases of fuel oil, containing different bio-component concentrations of (5 and 10 wt. %) has been studied under thermal shock conditions. It has been found that the addition of bio-components to the fuel oil decreases the corrosion resistance of all steels under investigation, this effect being the stronger, the higher was the concentration of bio-component addition. It has been shown, that in spite of bio-component addition, the X33CrNiMn23-8 steel containing the highest chromium concentration, behaved much better than three remaining steels due to the formation of the highly protective chromia scale.

scholarly journals Electrochemical Corrosion Behavior of Pure Mg Processed by Powder Metallurgy

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 986
Author(s):  
Jozef Minda ◽  
Stanislava Fintová ◽  
Branislav Hadzima ◽  
Pavel Doležal ◽  
Michaela Hasoňová ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Powder Metallurgy ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Corrosion Products ◽  
Uniform Corrosion ◽  
Electrochemical Corrosion Behavior ◽  
Powder Particles ◽  
Mechanical Bonding

Pure Mg samples were prepared by powder metallurgy using the cold and hot compacting methods. Cold compacted pure Mg (500 MPa/RT) was characterized by 5% porosity and the mechanical bonding of powder particles. Hot compacted samples (100 MPa/400 °C and 500 MPa/400 °C) exhibited porosity below 0.5%, and diffusion bonding combined with mechanical bonding played a role in material compaction. The prepared pure Mg samples and wrought pure Mg were subjected to corrosion tests using electrochemical impedance spectroscopy. Similar material corrosion behavior was observed for the samples compacted at 500 MPa/RT and 100 MPa/400 °C; however, hot compacted samples processed at 500 MPa/400 °C exhibited longer corrosion resistance in 0.9% NaCl solution. The difference in corrosion behavior was mainly related to the different binding mechanisms of the powder particles. Cold compacted samples were characterized by a more pronounced corrosion attack and the creation of a porous layer of corrosion products. Hot compacted samples prepared at 500 MPa/400 °C were characterized by uniform corrosion and the absence of a layer of corrosion products on the specimen surface. Powder-based cold compacted samples exhibited lower corrosion resistance compared to the wrought pure Mg, while the corrosion behavior of the hot compacted samples prepared at 500 MPa/400 °C was similar to that of wrought material.

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