Research on Surface Corrosion of the Adaptive Expandable Inner Bracing Screen

2010 ◽  
Vol 146-147 ◽  
pp. 1260-1264
Author(s):  
Jian Min Ma ◽  
Yong Hong Liu ◽  
Hang Li ◽  
Zhi Fei Liu
Keyword(s):  
Corrosion Rate ◽  
Calcium Ion ◽  
Ph Value ◽  
Chloride Ion ◽  
Effect Of Temperature ◽  
Corrosion Mechanism ◽  
Surface Corrosion ◽  
Sand Control ◽  
Chlorine Ion ◽  
Screen Surface

The surface corrosion mechanism of the adaptable and expandable inner bracing screen is introduced, experiment and analysis was made for the surface corrosion with the effect of temperature, chloride ion, calcium ion, pH value, this offer help to the application of adaptable and expandable sand control screen. The results show that surface corrosion rate is expedited with the temperature increase during 30 °C～80 °C, it reach the highest spot at 80 °C and then declined. The screen surface occur dot-corrosion easily in solution which contain chlorine ion, corrosion rate decline with the concentration increase of chlorine ion. Calcium ion can restrain the screen surface corrosion rate. Corrosion rate is decline with the pH value increase during the pH value of 3～6.

Effect of Temperature and H2S Concentration on Corrosion of X52 Pipeline Steel in Acidic Solutions

2013 ◽  
Vol 743-744 ◽  
pp. 589-596 ◽  
Author(s):  
Meng Liu ◽  
Jian Qiu Wang ◽  
Wei Ke
Keyword(s):  
Corrosion Rate ◽  
Pipeline Steel ◽  
Corrosion Products ◽  
Effect Of Temperature ◽  
Corrosion Mechanism ◽  
General Corrosion ◽  
Ferrous Sulfide ◽  
Immersion Corrosion ◽  
Different Temperatures ◽  
Diffraction Patterns

The corrosion behavior of X52 pipeline steel in H2S solutions was investigated through immersion corrosion test which was carried out in a high temperature and high pressure autoclave at different temperatures and H2S concentrations. General corrosion rates were calculated based on the weight loss of samples. The morphology and the chemical composition of the corrosion products were obtained by Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS). The crystal structure of corrosion products was analyzed by X-Ray diffraction patterns (XRD). The corrosion products consisted mainly of the sulfide compounds (mackinawite, cubic ferrous sulfide, troilite and pyrrhotite). The corrosion products included two layers: the inner iron-rich layer and the outer sulfur-rich layer. Under H2S concentrations of 27g/L, the corrosion rate increased with the increase of temperature up to 90°C and then decreased at 120°C, finaly increased again. The corrosion rate first increased with H2S concentrations then decreased at 120°C. The structure and stability of the corrosion products due to different corrosion mechanism had a major impact on the corrosion rate. The corrosion resistance of the corrosion products increased as follows: mackinawite < cubic ferrous sulfide < troilite < pyrrhotite.

scholarly journals Experimental Investigation of the Corrosion Behavior of Friction Stir Welded AZ61A Magnesium Alloy Welds under Salt Spray Corrosion Test and Galvanic Corrosion Test Using Response Surface Methodology

2013 ◽  
Vol 2013 ◽  
pp. 1-17 ◽  
Author(s):  
A. Dhanapal ◽  
S. Rajendra Boopathy ◽  
V. Balasubramanian ◽  
K. Chidambaram ◽  
A. R. Thoheer Zaman
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Rate ◽  
Corrosion Test ◽  
Ph Value ◽  
Galvanic Corrosion ◽  
Salt Spray ◽  
Chloride Ion ◽  
Ion Concentration ◽  
Salt Spray Corrosion ◽  
Friction Stir

Extruded Mg alloy plates of 6 mm thick of AZ61A grade were butt welded using advanced welding process and friction stir welding (FSW) processes. The specimens were exposed to salt spray conditions and immersion conditions to characterize their corrosion rates on the effect of pH value, chloride ion concentration, and corrosion time. In addition, an attempt was made to develop an empirical relationship to predict the corrosion rate of FSW welds in salt spray corrosion test and galvanic corrosion test using design of experiments. The corrosion morphology and the pit morphology were analyzed by optical microscopy, and the corrosion products were examined using scanning electron microscope and X-ray diffraction analysis. From this research work, it is found that, in both corrosion tests, the corrosion rate decreases with the increase in pH value, the decrease in chloride ion concentration, and a higher corrosion time. The results show the usage of the magnesium alloy for best environments and suitable applications from the aforementioned conditions. Also, it is found that AZ61A magnesium alloy welds possess low-corrosion rate and higher-corrosion resistance in the galvanic corrosion test than in the salt spray corrosion test.

scholarly journals The Effect of Sodium Hydroxide Solutions with Different Ph on the Corrosion Of Iron Alloy (C1010) In Industrial Water

2018 ◽  
Vol 15 (1) ◽  
pp. 6136-6141 ◽  
Author(s):  
Mouayed yousif Kadhum ◽  
Chasib Khaiber Bkhakh ◽  
Muayad Hasan Albehadili
Keyword(s):  
Weight Loss ◽  
Corrosion Rate ◽  
Sodium Hydroxide ◽  
Ph Value ◽  
Iron Alloy ◽  
Corrosion Current ◽  
Effect Of Temperature ◽  
Industrial Water ◽  
Alloy Type ◽  
Corrosion Of Iron

 The effect of increasing pH value in the corrosion of iron alloy type (C1010) was studied in the presence of different pH solutions of sodium hydroxide dissolved in industrial water at 35ËšC  and it was found that the corrosion rate of iron alloy was less at pH of 9.5 . This result was proved by measuring some thermodynamic parameters such as corrosion current and covered surface area that pertain to corrosion using weight loss electrical (Tafel plot ) methods . Also the effect of temperature on the rate of corrosion at ( 25ËšC , 35ËšC and 45ËšC ) at different pH was studied and it was found that the rate of corrosion is increased with increasing the temperature at the same pH.

Temperature Effect on Pseudomonas Aeruginosa Growth and Its Presence on Corrosion of Steel Wire Rope

2020 ◽  
Vol 1010 ◽  
pp. 92-97
Author(s):  
Nurhaziqah Hasim ◽  
Nur Syuhada Azmi ◽  
Wan Fahmin Faiz Wan Ali ◽  
Esah Hamzah ◽  
Adibah Yahya ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Corrosion Rate ◽  
Ph Value ◽  
Steel Wire ◽  
Wire Rope ◽  
Bacterial Activity ◽  
Effect Of Temperature ◽  
Solution Interface ◽  
Corrosion Pitting ◽  
Corrosion Of Steel

Bacterial can initiate, accelerate, and/or inhibit corrosion processes through a number of different ways, including modification of the localized environment at the metal/solution interface by causing pitting attack. In this work, the effect of temperature on bacteria (P.Aeruginosa sp) growth will be investigated the nature of bacteria before further investigated its corrosion effect on steel wire rope. It is found that the bacteria grew actively at 30°C. The pH value was also changed from 7 to 8. The corrosion rate with the presence of bacteria has been found increased from 9.95 x 10-7 mdy to 4.884 x 10-5 mdy. While corrosion pitting is found directly proportional to the bacterial activity.

Influence of Iron(II) and Iron(III) Ions on the Corrosion of MTR Fuel Element Claddings in Repository-Relevant Brines

1997 ◽  
Vol 506 ◽  
Author(s):  
S. Zschunke ◽  
J. Fachinger
Keyword(s):  
Corrosion Rate ◽  
Fuel Element ◽  
Fuel Cycle ◽  
Ph Value ◽  
Corrosion Mechanism ◽  
Federal Republic Of Germany ◽  
Spent Fuel ◽  
Material Test ◽  
Fuel Elements ◽  
Cladding Material

ABSTRACTAfter the USA decided in 1988 to no longer accept spent fuel elements from German material test reactors (MTR), a national back-end fuel cycle alternative was sought in the Federal Republic of Germany [1]. The aim is their direct final disposal in deep, stable geologic formations. The corrosion of material test reactor (MTR)-fuel element claddings (aluminium) in repository-relevant brines was examined. Before the aluminium cladding material can corrode, the POLLUX cask, containing the fuel elements, must be corroded. In this case, iron(II) and iron(III) ions are present in the brine. These ions decisively influence the corrosion of the MTR fuel element cladding material, therefore the mechanism responsible for this phenomenon should be identified. Tests were performed in which Fe(II) and Fe(III) salts were added to the brines. In these experiments, the percentage mass decrease of the aluminium cladding, the iron content of the brine, as well as the pH value were determined. As expected the results provided the information about the corrosion mechanism. The higher the concentration of iron ions in the brines, the higher the aluminium corrosion rate was for all three brines. Identical redox equilibria between Fe(II) and Fe(III) were formed in the brine, irrespective of whether Fe(II) or Fe(III) salt had been added. It is assumed that the acceleration of the corrosion rate is based on the fact that Fe(II) is reduced to metallic iron by absorbing the electrons produced during the oxidation of aluminium to Al(III). The aluminium cladding material does not function as a barrier for the release of radionuclides from the fuel elements. The results of this study show that the 0.38 mm thick aluminium cladding will corrode through after approximately four weeks.

scholarly journals ANALYSIS ON AlMg2 AS RSG-GAS CLADDING MATERIAL CORROSION IN CHLORIDE CONTAINING WATER

2018 ◽  
Vol 21 (2) ◽  
pp. 83
Author(s):  
Febrianto Bahar ◽  
Sriyono Sriyono ◽  
Geni Rina Sunaryo
Keyword(s):  
Corrosion Rate ◽  
Laboratory Experiments ◽  
Research Reactor ◽  
Chloride Ion ◽  
Ion Concentration ◽  
Effect Of Temperature ◽  
Primary Coolant ◽  
Demineralized Water ◽  
Poor Treatment ◽  
Cladding Material

AnalYsis On AlMg2 AS RSG-GAS CLADDING material corrosion IN CHLORIDE CONTAINING WATER. The AlMg2is one of an alluminium alloy that used as cladding material for the RSG GA. Siwabessy (RSG-GAS) research reactor in Serpong, Indonesia. The reactor uses demineralized water as primary coolant with 6.5 to 7.5 of pH. A poor treatment of water in primary coolant can lead to the problem of AlMg2 integrity. The primary coolant concentration of chloride must lower than 0.0094 ppm to protect cladding corrosion. The purpose of this study is to determine the effect of temperature and chloride ion concentration to AlMg2. The method in this research is to observe the corrosion rate for AlMg2 material by using Potentiostat. The laboratory experiments were conducted in various temperatures (28, 35, 40 and 45°C) and concentration of sodium chloride of 0.005, 0.010, 0.015, 0.020, 0.025, 0.030 and 0.035 ppm. The results show the corrosion rates were very small, and the highest corrosion rate occurred is 1.23 x 10-3mpy in 0.035 ppm of NaCl at 45°C .

Unique Autoclave Stress Induced Failure Mechanism

2005 ◽  
Author(s):  
John Butchko ◽  
Bruce T. Gillette
Keyword(s):  
Corrosion Rate ◽  
Grain Boundary ◽  
Failure Analysis ◽  
Failure Mechanism ◽  
Metal Corrosion ◽  
Corrosion Mechanism ◽  
Reliability Testing ◽  
Process Change ◽  
Transistor Reliability ◽  
Pass Through

Abstract Autoclave Stress failures were encountered at the 96 hour read during transistor reliability testing. A unique metal corrosion mechanism was found during the failure analysis, which was creating a contamination path to the drain source junction, resulting in high Idss and Igss leakage. The Al(Si) top metal was oxidizing along the grain boundaries at a faster rate than at the surface. There was subsurface blistering of the Al(Si), along with the grain boundary corrosion. This blistering was creating a contamination path from the package to the Si surface. Several variations in the metal stack were evaluated to better understand the cause of the failures and to provide a process solution. The prevention of intergranular metal corrosion and subsurface blistering during autoclave testing required a materials change from Al(Si) to Al(Si)(Cu). This change resulted in a reduced corrosion rate and consequently prevented Si contamination due to blistering. The process change resulted in a successful pass through the autoclave testing.

scholarly journals Investigation of Corrosion Rate and Rust Expansion Form of Segment Reinforcement for Shield Tunnel by Combined Action of Soil Loading, Chloride Ion and Stray Current

2021 ◽  
Vol 13 (6) ◽  
pp. 3444
Author(s):  
Zheng Li ◽  
Hao Jin ◽  
Shuo Yu
Keyword(s):  
Corrosion Rate ◽  
Steel Corrosion ◽  
Chloride Ion ◽  
Shield Tunnel ◽  
Uniform Corrosion ◽  
Stray Current ◽  
Soil Loading ◽  
Capacity Degradation ◽  
Expansion Form ◽  
Combined Action

Segment reinforcement corrosion can cause bearing-capacity degradation of shield tunnel, which is unsafe for the metro operation. Therefore, a three-dimensional computational model was proposed in this paper to study the corrosion rate and rust expansion form of segment reinforcement by the combined action of soil loading, chloride ion and stray current. The results show that the arch waist segment steel corrosion rate in the middle is larger than the ends. The rust expansion form of segment reinforcement appears be an eccentric circle. The radius size and circular center are related to the non-uniform corrosion coefficient and the maximum corrosion current density.

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