Corrosion Behaviors of QSn4-3 under Two Kinds of Marine Advantage Bacteria Environment

2011 ◽  
Vol 335-336 ◽  
pp. 752-755
Author(s):  
Cai Xiang Gu ◽  
Xing Hua Du ◽  
Guan Jun Zhu ◽  
Yan Sheng Yin ◽  
Wen Ge Li
Keyword(s):  
Electron Microscopy ◽  
Corrosion Potential ◽  
Early Stage ◽  
Corrosion Process ◽  
Marine Microorganisms ◽  
Facultative Anaerobic ◽  
Corrosion Behaviors ◽  
Microbial Film ◽  
Combined Action ◽  
Scanning Electron

Polarization curves, corrosion potential, scanning electron microscopy (SEM) were adopted to investigate the corrosion behaviors of QSn4-3 under two kinds of marine advantage bacteria (anaerobic SRB and facultative anaerobic Vibrio natriegens) environment. The results show that the microbial film has some effects on inhibiting corrosion of QSn4-3 at the early stage of corrosion; the existence of marine microorganisms accelerates the corrosion process of QSn4-3; the combined action of SRB and V.natriegens accelerates the corrosion obviously and QSn4-3 coupon is more prone to pitting corrosion.

Corrosion Behaviors of 0Cr18Ni9 Stainless Steel under the Combination Action of Sulfate-Reducing Bacteria and V.natriegens

2011 ◽  
Vol 356-360 ◽  
pp. 161-164
Author(s):  
Cai Xiang Gu ◽  
Xiao Ming Zhao ◽  
Yan Sheng Yin ◽  
Gui Jun Ji
Keyword(s):  
Stainless Steel ◽  
Corrosion Potential ◽  
Sea Water ◽  
Microbial Corrosion ◽  
Sulfate Reducing ◽  
Facultative Anaerobic ◽  
Corrosion Behaviors ◽  
Microbial Film ◽  
Combined Action ◽  
Reducing Bacteria

Advantage strains SRB and V.natriegens were obtained from the China East Sea for this study. Polarization curves, corrosion potential, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analyses were adopted in order to investigate the corrosion behaviors of 0Cr18Ni9 stainless steel under the combination action of anaerobic SRB and facultative anaerobic V.natriegens, The characteristics and mechanisms of microbial corrosion action in sea water were analyzed in this paper. The results show that SRB and V.natriegens promote each other’s growth when cultivated in the mixed microbe medium, in which the rate of corrosion is higher than that in the single microbe; Under the combined action of the mixed microbe, the microbial film gets wider and thicker, and corrosion products and metabolite are produced, which furthermore accelerates the passivation and pit corrosion to the 0Cr18Ni9 stainless steel.

Tribocorrosion Behaviors of D40 Steel in Artificial Seawater

2017 ◽  
Vol 898 ◽  
pp. 840-848
Author(s):  
Liang Shi ◽  
Shao Peng Qu ◽  
Hai Yan Chen ◽  
Yan Sheng Yin ◽  
Li Jing Yang
Keyword(s):  
Electron Microscopy ◽  
Oxygen Diffusion ◽  
Energy Dispersive Spectrometry ◽  
Diffusion Rate ◽  
Corrosion Process ◽  
Ion Adsorption ◽  
White Light Interferometry ◽  
Friction Process ◽  
Surface Morphologies ◽  
Scanning Electron

The friction, corrosion and tribocorrosion experiments were carried out to study the tribocorrosion characteristics of the D40 steel. Friction process was undertaken using a TriboLab. The electrochemical property of D40 steel was studied using an electrochemical workstation. The surface morphologies of the D40 steel after experiments were characterized by white light interferometry, scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The results indicated that both the tribocorrosion and corrosion process of D40 steel under the condition of seawater were controlled by the cathodic oxygen diffusion. The diffusion rate of oxygen in the solution was accelerated by the friction. The phenomenon of Cl ion adsorption was more obvious for the D40 steel during tribocorrosion test, and the corrosion resistance was significantly reduced due to the promotion of friction.

Effect of sedimentary environment on shale lithofacies in the lower third member of the Shahejie Formation, Zhanhua Sag, eastern China

2017 ◽  
Vol 5 (4) ◽  
pp. T487-T501 ◽  
Author(s):  
Tingwei Li ◽  
Zhenxue Jiang ◽  
Chenlu Xu ◽  
Yuan Yuan ◽  
Pengfei Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Early Stage ◽  
Eastern China ◽  
Sedimentary Environment ◽  
Gas Production ◽  
Bohai Bay ◽  
Calcareous Shale ◽  
Shahejie Formation ◽  
Scanning Electron

Research on shale lithofacies is important for shale oil and gas production. This study focused on the lower third member of the Shahejie Formation ([Formula: see text]) in the Luo-69 well in the Zhanhua Sag, Jiyang Depression, Bohai Bay Basin, eastern China. Several methods, including thin section observations, total organic carbon (TOC) analysis, X-ray diffraction analysis, quantitative evaluations of minerals by scanning electron microscopy, major and trace-element analyses, and field emission-scanning electron microscopy, are used to investigate the effect of sedimentary environment on the type and distribution of shale lithofacies. Our research indicates that 36 types of shale lithofacies can be classified based on the TOC content, mineral composition, and sedimentary structure, of which five types are identified in the study area. The [Formula: see text] shale has a high calcareous mineral content (average of 49.64%), low clay and siliceous minerals contents (averages of 19.54% and 19.02%, respectively), a high TOC content (average of 3.00 wt%), and well-developed horizontal bedding. The sedimentary environment during the deposition of the [Formula: see text] shale in the Zhanhua Sag had a warm and moist climate, limited provenance, saline water, and strong reducibility. The sedimentary environment in the early stage had a drier climate, more limited provenance, higher salinity, and stronger reducibility than that in the later stage. Shale lithofacies can reflect a certain sedimentary environment and depositional process; similarly, a depositional environment controls the type and distribution of shale lithofacies. Due to the characteristics of the [Formula: see text] sedimentary environment, organic-rich massive mixed shale, organic-rich bedded mixed-calcareous shale, organic-rich laminated calcareous shale, and organic-fair laminated calcareous shale are developed in the [Formula: see text] formation from top to bottom.

scholarly journals Effect of Cu on the Fracture and Exfoliation Corrosion Behavior of Al-Zn-Mg-xCu Alloy

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1048 ◽  
Author(s):  
Huibin Jiao ◽  
Kanghua Chen ◽  
Songyi Chen ◽  
Zhen Yang ◽  
Peng Xie ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Exfoliation Corrosion ◽  
Cu Content ◽  
Short Transverse ◽  
Transmission Electron ◽  
Corrosion Behaviors ◽  
Mechanical Tensile ◽  
Scanning Electron ◽  
Better Than

In the present work, the influence of Cu content on microstructure, mechanical properties and exfoliation corrosion behaviors of Al-Zn-Mg-xCu alloy extrusions has been investigated in longitudinal-transverse (L-T) and short-longitudinal (S-L) directions by means of mechanical tensile and exfoliation corrosion testing combined with optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that a higher Cu content significantly decreased the fracture toughness and ductility of the alloy in S-L direction compared with L-T direction. Concomitant with the increase in Cu content, a transition in fracture mode was observed from transgranular dimpled rupture to intergranular rupture in S-L direction. Moreover, the exfoliation corrosion (EXCO) resistance of the alloy decreased as the Cu content increased and the exfoliation corrosion resistance of the alloy in short-transverse (S-T) direction was better than that of L-T direction. These results were mainly associated with the large number of coarse intermetallics caused by high Cu content in the L-T direction of alloy.

scholarly journals Experimental Study On Antibacterial Properties of Iodine-Coated Implant in Acute Osteomyelitis Model

2021 ◽  
Author(s):  
Xiqi Zhuang ◽  
Weibing Yang ◽  
Yongquan Zhang ◽  
Wanming Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Early Stage ◽  
Antibacterial Properties ◽  
Bacterial Suspension ◽  
Acute Osteomyelitis ◽  
Marrow Cavity ◽  
Coated Implant ◽  
K Wires ◽  
Scanning Electron

Abstract Purpose We have developed a iodine-coated implant and evaluated its antibacterial properties against Gram-negative bacteria by constructing an experimental osteomyelitis model.Methods In this study, 16 titanium Kirschner-wires were selected, of which 8 titanium K-wires were treated with iodine on the surface by electrophoretic deposition with PVP-I solution. In our study, the standard strain of Escherichia coli (ATCC 25922) was selected, and 16 New Zealand rabbits were selected. There were 8 rabbits in the iodine-coated group and 8 rabbits in the non-iodine-coated group. All animals were drilled in the left proximal tibia after successful anesthesia.After that,the iodine-coated group was implanted with iodine-coated titanium K-wires.Then, 25ul of 2×108CFU/ml bacterial suspension was injected into the bone marrow cavity with pipette gun, and the bone hole was sealed with bone wax.They were reared in cages for 1 week after operation, and evaluated and analyzed by microbiology, histopathology, scanning electron microscopy, etc.Results The results of gross wound score and microbiology showed that the wound infection of the iodine-coated group was less severe than that of the non-iodine-coated group, which was confirmed by the histopathological results. Scanning electron microscopy and confocal microscopy showed that the amount of bacteria on the surface of iodine-coated K-wires was significantly lower than that non-iodine-coated K-wires. Conclusions In this study, we have verified that the iodine-coated titanium implant could effectively inhibit E. coli infection in the early stage of infection by constructing an acute osteomyelitis model.

Processibility and Thermo-Mechanical Properties of Epoxy as Reactive Plasticizer of Polyetherimide

2017 ◽  
Vol 264 ◽  
pp. 228-231
Author(s):  
Nasuha Marzuki ◽  
Muhamad Amirul Ashraf Mohd Alias ◽  
Arjulizan Rusli ◽  
Zulkifli Ahmad
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Early Stage ◽  
Scanning Calorimetry ◽  
Two Phase ◽  
Dispersed Particles ◽  
Epoxy Blends ◽  
Scanning Electron

A relatively new way to improve processibility thermoplastics is via the use of crosslinkable monomers which can act as reactive plasticizers and reduce the viscosity in the early stage of processing. The monomers can polymerize and phase separate during final stage of processing thus recovering the original thermoplastics properties. In this work, the applicability of epoxy as reactive plasticizer for polyetherimide (PEI) was investigated. The properties of PEI/epoxy blends without and with curative were studied in order to determine the effect of the monomer on the processibility of the PEI and the thermo-mechanical properties of cured blends. Differential Scanning Calorimetry on blends without curative indicated single glass transition temperature (Tg) at high PEI content suggesting miscibility of the system and plasticization of PEI in the presence of epoxy while cured blends indicated two Tg due to phase separation. Scanning electron microscopy of the cured blends indicated two phase morphology with PEI dispersed particles size increased in continuous epoxy matrix with increasing PEI (up to 30wt% PEI). In blends with 40wt% PEI and more, phase inverted morphology was observed where increasing PEI content caused reduction of epoxy particle size in continuous PEI matrix.

scholarly journals SEM and AES Analysis of Corrosion in Steel Cans of Meat and Poultry Food Industry Influenced by Microorganisms Affecting the Competitiveness in Northwest of Mexico

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
César Sánchez Ocampo ◽  
Gustavo López Badilla ◽  
Elizabeth Romero Samaniego ◽  
Sandra Luz Toledo Perea ◽  
Josefina Campos García
Keyword(s):  
Electron Microscopy ◽  
Electron Spectroscopy ◽  
Food Industry ◽  
Auger Electron ◽  
Arid Zone ◽  
Corrosion Process ◽  
Santa Ana ◽  
Arid And Semiarid ◽  
Scanning Electron ◽  
Important Activity

The food industry of meat and poultry food is very important activity in the economy of the northwest of Mexico where the Sonora state (with Hermosillo and Santa Ana cities as arid and semiarid zones and Guaymas as marine regions) and Baja California state (Mexicali as arid zone and Tijuana as marine region) are located. The meat and poultry industries produce meat, milk, and eggs, which are recommended for their nutritive properties. An evaluation of micro- and nanocorrosion was made with an optical sensor used to detect microorganisms (MO) inside of the steel cans. The techniques applied to evaluate the deterioration were the Scanning Electron Microscopy (SEM) and the Auger Electron Spectroscopy (AES), to obtain the morphology of microorganisms formed in the internal area of the metallic containers. Also the chemical composition to identify and determine the conditions for growth of microorganisms was obtained with respect to moisture and temperature in each region analyzed. The sulfur was the principal pollutant agent in arid and semiarid zones and chloride in marine zones that promoted the corrosion process. The presence of corrosion in the food industry decreases their competitiveness.

Corrosion Behaviors of B10 under the Combination Action of Sulfate-Reducing Bacteria and V.Natriegens

2011 ◽  
Vol 343-344 ◽  
pp. 101-105
Author(s):  
Cai Xiang Gu ◽  
Xing Hua Du ◽  
Wei Li ◽  
Guan Jun Zhu
Keyword(s):  
Sea Water ◽  
Marine Microorganisms ◽  
Microbial Corrosion ◽  
Sulfate Reducing ◽  
Leading Role ◽  
Matrix Surface ◽  
The Matrix ◽  
Corrosion Behaviors ◽  
Combined Action ◽  
Mixed Bacteria

Polarization curves, corrosion potential, scanning electron microscopy (SEM) were adopted in order to investigate the corrosion behaviors of B10 under the combination action of anaerobic SRB and facultative anaerobic V.natriegens. The characteristics and mechanisms of microbial corrosion action in sea water were analyzed in this paper. The results show that the existence of marine microorganisms accelerates the corrosion process of B10; SRB in the mixed microbe medium plays a leading role; the combined action of SRB and V.natriegens influences the matrix surface reunion phenomenon seriously and prone to pitting corrosion. Furthermore, this investigation indicates that the affectability of microbial corrosion of the base metal can be shown as follows: SRB > Mixed bacteria > V.natriegens > Sterile.

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