Review of Copper Atmospheric Corrosion in H2S

2014 ◽  
Vol 548-549 ◽  
pp. 177-181
Author(s):  
Ping Wang ◽  
Zhao Hui Yin ◽  
Han Tao Ren ◽  
Song Xu ◽  
Dong Wei Ma
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Atmospheric Corrosion ◽  
Corrosion Inhibitors ◽  
External Factors ◽  
Corrosion Mechanism ◽  
Corrosive Environment ◽  
Copper Corrosion ◽  
Environment Factors ◽  
The Impact

The losses due to copper corrosion in H2S atmospheric corrosion have attracted much focus. It’s important to improve copper corrosion resistance that the corrosion law, corrosion mechanism and characteristics were studied in H2S environment. This paper reviewed the corrosion behavior of copper, analyzed the impact of environment factors and corrosion analysis tools. Through evaluating and improving corrosion by external factors, including improving corrosive environment, using coating protection and adding corrosion inhibitors, appropriate corrosion measures were taken to extend the life of the equipment.

scholarly journals Effect of Oxide Scale Microstructure on Atmospheric Corrosion Behavior of Hot Rolled Steel Strip

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 517
Author(s):  
Bin Sun ◽  
Lei Cheng ◽  
Chong-Yang Du ◽  
Jing-Ke Zhang ◽  
Yong-Quan He ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Oxide Scale ◽  
Corrosion Product ◽  
Corrosion Behavior ◽  
Corrosion Test ◽  
Atmospheric Corrosion ◽  
Corrosion Mechanism ◽  
Type I ◽  
Rust Layer ◽  
Hot Rolled

The atmospheric corrosion behavior of a hot-rolled strip with four types (I–IV) of oxide scale was investigated using the accelerated wet–dry cycle corrosion test. Corrosion resistance and porosity of oxide scale were studied by potentiometric polarization measurements. Characterization of samples after 80 cycles of the wet–dry corrosion test showed that scale comprised wüstite and magnetite had strongest corrosion resistance. Oxide scale composed of inner magnetite/iron (>70%) and an outer magnetite layer had the weakest corrosion resistance. The corrosion kinetics (weight gain) of each type of oxide scale followed an initial linear and then parabolic (at middle to late corrosion) relationship. This could be predicted by a simple kinetic model which showed good agreement with the experimental results. Analysis of the potentiometric polarization curves, obtained from oxide coated steel electrodes, revealed that the type I oxide scale had the highest porosity, and the corrosion mechanism resulted from the joint effects of electrochemical behavior and the porosity of the oxide scale. In the initial stage of corrosion, the corrosion product nucleated and an outer rust layer formed. As the thickness of outer rust layer increased, the corrosion product developed on the scale defects. An inner rust layer then formed in the localized pits as crack growth of the scale. This attacked the scale and expanded into the substrate during the later stage of corrosion. At this stage, the protective effect of the oxide scale was lost.

Correlation of Surface Alloyed Microstructure of Pure Magnesium With its Corrosion Behavior

2012 ◽  
Vol 472-475 ◽  
pp. 161-164
Author(s):  
Yu Gao Liu
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Chloride Solution ◽  
Diffusion Time ◽  
Point Of View ◽  
Pure Magnesium ◽  
Corrosion Mechanism ◽  
Cross Sectional ◽  
Microstructure Characteristics ◽  
Solid Diffusion

This paper represents a summary of experimental results dealing with the time dependence of surface diffusion alloyed microstructure and its corrosion behavior at given temperature. The experiments were performed at 485°C for different solid diffusion time (6h, 12h, 18h ) and thus the surface alloyed microstructure of pure magnesium has been obtained. Optical and electrical microscopy and EDS compositions analysis were used to examine the cross sectional microstructure characteristics of alloyed layers of treated samples. It is shown that the new phases formed and its continuity, depending on the diffusion treated time at given temperature, have a noticeable influence on corrosion resistance and corrosion mechanism. The new formed phase Al5Mg11Zn4 was inert to the chloride solution compared with pure magnesium and acted as a corrosion barrier. It was concluded that the continuous Al5Mg11Zn4 phase was beneficial from the point of view of corrosion resistance.

Investigation on corrosion performance of multilayer Ni-P/TiO2 composite coating on steel

2016 ◽  
Vol 23 (3) ◽  
pp. 309-314
Author(s):  
M. Edwin Sahayaraj ◽  
J.T. Winowlin Jappes ◽  
I. Siva ◽  
N. Rajini
Keyword(s):  
Corrosion Resistance ◽  
Mild Steel ◽  
Corrosion Behavior ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Multilayer Coating ◽  
Electroless Nickel ◽  
Corrosion Mechanism ◽  
Corrosion Performance ◽  
Electroless Ni

AbstractElectroless nickel coating treatment improves the corrosion resistance of mild steel. This work aims at studying the corrosion behavior of electroless Ni-P/TiO2 composite and multilayer coatings applied to the mild steel substrate as their as-plated state and furnace annealed at various temperatures and compared both the coatings’ corrosion performance. The corrosion behavior of the deposits was evaluated by potentiodynamic polarization studies in 3.5 wt% sodium chloride solution. The results showed that the corrosion resistance of the multilayer coating was two times higher compared to the composite coatings. Further, the corrosion mechanism was discussed in terms of microstructure, phase transformation, grain size, and microstrain.

Influence of heat treatment on corrosion behavior of laser welded Mg-Gd-Y fusion zones

2020 ◽  
Vol 67 (4) ◽  
pp. 337-343
Author(s):  
Lyuyuan Wang ◽  
Jian Huang ◽  
Yong Peng ◽  
Yang Jia ◽  
Rong Ni
Keyword(s):  
Corrosion Resistance ◽  
Fusion Zone ◽  
Corrosion Behavior ◽  
Corrosion Mechanism ◽  
Content Type ◽  
Treated Condition ◽  
Heat Treated ◽  
Protective Films ◽  
Heat Treated Condition ◽  
Treated State

Purpose This paper aims to evaluate the corrosion resistance of fusion zones in different heat treated condition from laser welded Mg-Gd-Y alloys and analyze their intrinsic corrosion mechanism. Design/methodology/approach The corrosion behavior of fusion zone from laser-welded Mg-Gd-Y alloy joints in the as-welded, ageing and solution + ageing conditions was investigated in the 3.5 wt.% NaCl solution by immersion tests. Findings The corroded surface of as-welded fusion zone consists of dark and bright regions, and the bright regions were composed of high-density needle-like products, whereas some different extended direction of the cracks with lots of long ultrafine needle-shaped corrosion products appeared in the dark regions. The corrosion resistance of the fusion zone is slightly decreased after the ageing treatment. Originality/value The solution + ageing treated fusion zone exhibits the highest corrosion resistance than that of the as-welded and ageing treated state because of the full dissolution of the cathodic coarse eutectic compound, grains growth and relatively compact protective films. The inhomogeneous distribution of the β′ can somewhat improve the corrosion rate of solution + ageing treated fusion zone when compared with base metal.

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.

The RE Compound Using in Corrosion Inhibitor of Copper Alloy

2012 ◽  
Vol 549 ◽  
pp. 539-542
Author(s):  
Fang Xu ◽  
Shu Zhen Wu
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Inhibitor ◽  
Copper Alloy ◽  
Corrosion Inhibitors ◽  
Synergistic Effects ◽  
Salt Spray ◽  
Neutral Salt ◽  
Copper Corrosion ◽  
Sulfosalicylic Acid ◽  
Orthogonal Experiments

Based on neutral salt spray test and variance analysis, the RE salt compound using in the corrosion inhibitors of copper alloy has been studied. Synergistic effects among the RE salt, benzotriazole and sulfosalicylic acid were conducted through two orthogonal experiments. The results shows that the passive film has a better corrosion resistance after added RE salt,the synergistic effect is obvious in combined copper corrosion inhibitor.

Factors affecting the financial structure of Slovak and Czech enterprises in the Manufacture of machinery and equipment industry

2018 ◽  
Vol 8 (3) ◽  
pp. 121-126
Author(s):  
Lenka Kalusová ◽  
Peter Badura ◽  
Mariana Sedliačiková ◽  
Katarína Vavrová
Keyword(s):  
Financial Structure ◽  
External Factors ◽  
Academic World ◽  
Dominant Position ◽  
Factors Affecting ◽  
Scientific Methods ◽  
Environment Factors ◽  
Equipment Industry ◽  
Research And Education ◽  
The Impact

The financial structure of enterprises is influenced by many factors. The aim of this paper is to analyze, evaluate and assess the effect of selected internal corporate factors and external macro-environment factors on the financial structure of enterprises. All the studied enterprises were operating in the Manufacture of machinery and equipment industry. We have also analyzed whether there were any differences in the action of these factors between enterprises operating in various countries - Slovakia and Czech Republic (i.e. what was the impact of the environment on the corporate financial structure). The analysis has been done for the years 2009 - 2014. In addition to the standard scientific methods, the methods of multiple regression and correlation analysis have been used as well. The research results pointed to the fact that although the influence of some macro-environment factors has been proved, that were the internal corporate factors which had dominant position in shaping the financial structure of Slovak and Czech enterprises (concerning the Manufacture of machinery and equipment industry).© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of Academic World Research and Education Center. Keywords: Financial structure; internal corporate factors; external factors of macroenvironment.

Influence of single and dual particle reinforcements on the corrosion behavior of aluminum alloy based composites

2016 ◽  
Vol 232 (6) ◽  
pp. 520-532
Author(s):  
Yogesh K Singla ◽  
Rahul Chhibber ◽  
Avdesh ◽  
Shweta Goyal ◽  
Vipin Sharma
Keyword(s):  
Silicon Carbide ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Single Particle ◽  
Base Alloy ◽  
Corrosion Mechanism ◽  
Reinforced Composites ◽  
Particle Reinforced Composites ◽  
Zircon Sand

This article presents the results of a study on the corrosion characteristics of the single and dual particle reinforced aluminum alloy 6063 based composites. The reinforcements of silicon carbide and zircon sand were utilized to fabricate the composites by stir casting technique. The influence of reinforcement and their weight percentage on the hardness variations was investigated. The electrochemical tests in sodium chloride solution were conducted to study the corrosion performance of reinforced composites and base alloy. From the corrosion analysis, it was observed that the single particle reinforcement offered better solution on enhancing the corrosion resistance of base aluminum alloy in comparison with dual particle reinforced composites. In the single particle reinforced composites, addition of zircon sand exhibited increased corrosion resistance, when compared to silicon carbide reinforced composites. The governing mechanism behind increased corrosion resistance was found to be the absence of galvanic coupling between the elemental compounds and the corrosive media at particle–matrix interface. The scanning electron microscopy of composites was performed to analyze corrosion mechanism and correlated well with the corrosion behavior.

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.

Effects of Microstructural Arrangement on Hot Corrosion Resistance of a Pb-Sb Alloy for Battery Grids

2008 ◽  
Vol 595-598 ◽  
pp. 851-859 ◽  
Author(s):  
Wislei R.R. Osório ◽  
Claudia S. C. Aoki ◽  
Amauri Garcia
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Hot Corrosion ◽  
Life Time ◽  
Production Costs ◽  
Battery Life ◽  
Corrosion Mechanism ◽  
Lead Acid Batteries ◽  
Dendritic Microstructures ◽  
Lead Acid

It is well known that the solution characteristics, such as pH and temperature may affect the corrosion mechanism and the corrosion behavior. Lead acid batteries manufacturers have provided modifications into the grid project in order to decrease battery grid weight as well as to reduce the production costs, and to increase the battery life-time cycle and the corrosion-resistance. The performance of lead-acid batteries in automotive applications can significantly be affected by temperature variation. The aim of this study was to evaluate the effects of the microstructural morphology of a Pb-6.6wt%Sb alloy under conditions of hot corrosion. A water-cooled unidirectional solidification system was used to obtain coarse and fine dendritic microstructures. Electrochemical impedance spectroscopy (EIS) diagrams, potentiodynamic polarization curves and an equivalent circuit analysis were used to evaluate the corrosion behavior of fine and coarse dendritic samples in a 0.5M H2SO4 solution in three different working temperatures. It was found that independently of the working temperature, samples with finer dendritic microstructures provide better corrosion resistance than coarser ones, which is an indication that the former microstructural pattern may provide a higher battery life-time in severe temperatures than a coarser one.

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