scholarly journals Characterization of Corrosive Bacterial Consortia Isolated from Water in a Cooling Tower

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Rajasekar Aruliah ◽  
Yen-Peng Ting
Keyword(s):  
Metal Surface ◽  
Pitting Corrosion ◽  
Cooling Tower ◽  
Bacterial Species ◽  
Rrna Gene ◽  
Copper Metal ◽  
Bacterial Consortia ◽  
Weight Loss Method ◽  
Loss Method ◽  
Cultivation Techniques

An analysis of a culturable corrosive bacterial community in water samples from a cooling tower was performed using traditional cultivation techniques and its identification based on 16S rRNA gene sequence. Seven aerobic bacterial species were identified: Pseudomonas putida ARTYP1, Pseudomonas aeruginosa ARTYP2, Massilia timonae ARTYP3, Massilia albidiflava ARTYP4, Pseudomonas mosselii ARTYP5, Massilia sp. ARTYP6, and Pseudomonas sp. ARTYP7. Although some of these species have commonly been observed and reported in biocorrosion studies, the genus Massilia is identified for the first time in water from a cooling tower. The biocorrosion behaviour of copper metal by the new species Massilia timonae ARTYP3 was selected for further investigation using a weight loss method, as well as electrochemical and surface analysis techniques (SEM, AFM, and FTIR). In contrast with an uninoculated system, thin bacterial biofilms and pitting corrosion were observed on the copper metal surface in the presence of M. timonae. The use of a biocide, bronopol, inhibited the formation of biofilm and pitting corrosion on the copper metal surface.

Current state of knowledge: the canine gastrointestinal microbiome

2012 ◽  
Vol 13 (1) ◽  
pp. 78-88 ◽  
Author(s):  
Seema Hooda ◽  
Yasushi Minamoto ◽  
Jan S. Suchodolski ◽  
Kelly S. Swanson
Keyword(s):  
Bacterial Species ◽  
Rrna Gene ◽  
Dietary Interventions ◽  
Health Indices ◽  
Recent Emergence ◽  
Spatial Differences ◽  
Bowel Diseases ◽  
Health And Disease ◽  
Cultivation Techniques

AbstractGastrointestinal (GI) microbes have important roles in the nutritional, immunological, and physiologic processes of the host. Traditional cultivation techniques have revealed bacterial density ranges from 104to 105colony forming units (CFU)/g in the stomach, from 105to 107CFU/g in the small intestine, and from 109to 1011CFU/g in the colon of healthy dogs. As a small number of bacterial species can be grown and studied in culture, however, progress was limited until the recent emergence of DNA-based techniques. In recent years, DNA sequencing technology and bioinformatics have allowed for better phylogenetic and functional/metabolic characterization of the canine gut microbiome. Predominant phyla include Firmicutes, Bacteroidetes, Fusobacteria, Proteobacteria, and Actinobacteria. Studies using 16S ribosomal RNA (rRNA) gene pyrosequencing have demonstrated spatial differences along the GI tract and among microbes adhered to the GI mucosa compared to those in intestinal contents or feces. Similar to humans, GI microbiome dysbiosis is common in canine GI diseases such as chronic diarrhea and inflammatory bowel diseases. DNA-based assays have also identified key pathogens contributing to such conditions, including variousClostridium,Campylobacter,Salmonella, andEscherichiaspp. Moreover, nutritionists have applied DNA-based techniques to study the effects of dietary interventions such as dietary fiber, prebiotics, and probiotics on the canine GI microbiome and associated health indices. Despite recent advances in the field, the canine GI microbiome is far from being fully characterized and a deeper characterization of the phylogenetic and functional/metabolic capacity of the GI microbiome in health and disease is needed. This paper provides an overview of recent studies performed to characterize the canine GI microbiome.

scholarly journals Surface Protection of Carbon Steel by Hexanesulphonic Acid-Zinc Ion System

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
C. Mary Anbarasi ◽  
Susai Rajendran
Keyword(s):  
Weight Loss ◽  
Carbon Steel ◽  
Metal Surface ◽  
Zinc Ion ◽  
Protective Film ◽  
Bivalent Cation ◽  
Surface Protection ◽  
Weight Loss Method ◽  
Loss Method ◽  
Ac Impedance Spectra

Inhibition of corrosion of carbon steel in dam water by hexanesulphonic acid as its sodium salt C6H13SO3Na (SHXS) in the absence and presence of a bivalent cation zinc ion (Zn2þ) has been investigated using weight loss method. Results of weight loss method indicate that inhibition efficiency (IE) increased with increase of inhibitor concentration. Polarization study reveals that SHXS-Zn2+ system controls the cathodic reaction predominantly. AC impedance spectra reveal that a protective film is formed on the metal surface. The nature of the metal surface has been analysed by Fourier Transform Infrared Spectroscopy (FTIR) and Atomic Force Microscopy (AFM).

scholarly journals Inhibition of corrosion of SS 18/8 alloy is sea water by Thiourea-Zn2+ system

2021 ◽  
Vol 62 (3) ◽  
pp. 191-203
Author(s):  
Josephath Praveena ◽  
Somasundaram Gowri ◽  
Gunasekaran Nethravathi ◽  
Vincent Varsha ◽  
Arockiasamy Vieyana ◽  
...  
Keyword(s):  
Weight Loss ◽  
Corrosion Resistance ◽  
Metal Surface ◽  
Sea Water ◽  
Ac Impedance ◽  
Protective Film ◽  
Impedance Spectra ◽  
Weight Loss Method ◽  
Loss Method ◽  
Ac Impedance Spectra

The corrosion resistance of SS 18/8 in natural sea water, in presence of an inhibitor named Thiourea-Zn2+ has been evaluated. Weight loss method, polarization study and AC impedance spectra have been employed to evaluate the corrosion resistance of SS 18/8 alloy in natural sea water, in presence of an inhibitor named Thiourea-Zn2+ system. Weight loss method reveals that Thiourea-Zn2+ system offers a maximum corrosion inhibition efficiency of 95% in controlling corrosion of SS 18/8 alloy in natural sea water. Synergism parameters are found to be greater than 1, confirming the synergistic effect existing between Thiourea-Zn2+. Adsorption of inhibitor molecules on the metal surface obey Langmuir adsorption isotherm. Polarisation study reveals that the inhibitors named Thiourea-Zn2+ system functions as mixed type of inhibitor. AC impedance spectra confirm the formation of a protective film on the metal surface. This formulation of Thiourea-Zn2+ may be used in cooling water systems where SS 18/8 alloy pipelines are used to carry sea water which is used as coolant. Also, Thiourea-Zn2+ coating can be given on SS 18/8 alloy to protect it from corrosion by sea water when SS 18/8 alloy is used as hull plates in ship industry.

Corrosion of 16Mn in High Pressure Carbon Dioxide Saturated NACE Solutions with Hydrogen Sulfide

2007 ◽  
Vol 353-358 ◽  
pp. 2615-2618
Author(s):  
Qi Zhou ◽  
Jian Jun Liu ◽  
Qin Ma ◽  
Gen Shun Ji ◽  
Tie Ming Guo ◽  
...  
Keyword(s):  
Pitting Corrosion ◽  
Co2 Corrosion ◽  
Experimental Conditions ◽  
Hydrogen Damage ◽  
H2s Corrosion ◽  
Partial Pressure Of Co2 ◽  
Weight Loss Method ◽  
Loss Method ◽  
Micro Analysis ◽  
16Mn Steel

The paper deals mainly with the corrosion of 16Mn steel under the condition of three different high temperatures and in NACE solution saturated with H2S at 1MPa partial pressure of CO2, by means of autoclave, SEM, XRD, weight loss method and electron-probe micro-analysis. The result showed: under the experimental conditions, the serious CO2/H2S corrosion happened to 16Mn steel ,so that the main corrosion films, ferrous sulfide, could be clearly found on both sides of the samples; at 60°C, characteristics of pitting corrosion manifested centered chiefly around CO2 corrosion ; at 90°Cand 120°C, around H2S ones . It was the cooperating effects of both the hydrogen damage and pitting corrosion caused by CO2/H2S corrosion that formed the special corrosion features on the surface of steel to a certain degree. It was indicated that the corrosion of CO2/H2S was the result of interaction of multi-factors.

scholarly journals Corrosion Inhibition Effect of Carbon Steel in Sea Water by L-Arginine-Zn2+System

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
S. Gowri ◽  
J. Sathiyabama ◽  
S. Rajendran
Keyword(s):  
Carbon Steel ◽  
Metal Surface ◽  
Sea Water ◽  
Protective Film ◽  
Anodic Reaction ◽  
Polarization Study ◽  
Afm Analysis ◽  
Weight Loss Method ◽  
Loss Method ◽  
Ac Impedance Spectra

The inhibition efficiency of L-Arginine-Zn2+system in controlling corrosion of carbon steel in sea water has been evaluated by the weight-loss method. The formulation consisting of 250 ppm of L-Arginine and 25 ppm of Zn2+has 91% IE. A synergistic effect exists between L-Arginine and Zn2+. Polarization study reveals that the L-Arginine-Zn2+system functions as an anodic inhibitor and the formulation controls the anodic reaction predominantly. AC impedance spectra reveal that protective film is formed on the metal surface. Cyclic voltammetry study reveals that the protective film is more compact and stable even in a 3.5% NaCl environment. The nature of the protective film on a metal surface has been analyzed by FTIR, SEM, and AFM analysis.

Selection of Material with High Salt Concentration in Preheating Section of Supercritical Water Oxidation System

2013 ◽  
Vol 788 ◽  
pp. 440-443 ◽  
Author(s):  
Xing Ying Tang ◽  
Shu Zong Wang ◽  
Li Li Qian ◽  
Jia Ming Lu
Keyword(s):  
Supercritical Water ◽  
Pitting Corrosion ◽  
Water Oxidation ◽  
Dual Phase Steel ◽  
Dual Phase ◽  
Supercritical Water Oxidation ◽  
Weight Loss Method ◽  
Loss Method ◽  
Oxidation System ◽  
Selection Of

The corrosion behavior of Incoloy800, Incoloy825 and dual-phase steel2205 were studied on preheating section (275°C, 25MPa and [Cl1] 5500ppm) of supercritical water oxidation system. The results were investigated by means of scanning electron microscopy and energy dispersive spectroscopy. Incoloy800 presented pitting corrosion and corrosion on the surface of Incoloy825 and dual-phase steel2205 is not significant. Molybdenum can improve resistance to pitting corrosion and dual-phase steel shows a good corrosion resistance under the preheating section. Corrosion rates of Incoloy800, Incoloy825 and dual-phase steel2205 were 7.6mm/s, 2.6mm/s and 1.8mm/s, respectively, which were investigated by weight loss method.

scholarly journals Inhibition of corrosion of mild steel in well water by an aqueous extract of soapnut (Sapindus Trifoliatus)

2021 ◽  
Vol 62 (4) ◽  
pp. 277-290
Author(s):  
Josephath Praveena ◽  
Jeyaraj Clara ◽  
Susai Rajendran ◽  
Antony Amalraj
Keyword(s):  
Mild Steel ◽  
Metal Surface ◽  
Inhibition Efficiency ◽  
Well Water ◽  
Impedance Spectra ◽  
Polarization Study ◽  
Weight Loss Method ◽  
Inhibitor System ◽  
Loss Method ◽  
Ac Impedance Spectra

Inhibition efficiency of an aqueous extract of soapnut (Sapindus Trifoliatus) and Zn2+in controlling corrosion of mild steel in well water at room temperature has been evaluated by using weight loss method, polarization study and AC impedance spectra. Dynamic light scattering and Vickers hardness have also been employed. Weight loss method reveals that the formulation consisting of 10 ml soapnut extract and 50 ppm Zn2+ has 97 % inhibition efficiency in controlling corrosion of mild steel immersed in well water. Synergism parameters suggest that a synergistic effect exists between soapnut extract and Zn2+. Adsorption isotherm of metal surface obeys Langmuir adsorption isotherm. Polarization study reveals that the inhibitor system functions as anodic type of inhibitor. AC impedance spectra confirm the protective film formed on the metal surface. Dynamic light scattering (DLS) study reveals surface is in nano meter scale. The Vickers hardness of metal surface was increases in inhibitor system.

scholarly journals Inhibition of corrosion of mild steel by an alcoholic extract of a seaweed Sargassum muticum

2021 ◽  
Vol 62 (4) ◽  
pp. 304-315
Author(s):  
Mallika Arockiaraj ◽  
Suyambulingam Kirubavathy ◽  
Abdulhameed Al-Hashem ◽  
Rajendran Santhammal ◽  
R.M. Joany ◽  
...  
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Metal Surface ◽  
Sargassum Muticum ◽  
Alcoholic Extract ◽  
Protective Film ◽  
Polarization Study ◽  
Weight Loss Method ◽  
Loss Method ◽  
Ac Impedance Spectra

An alcoholic extract of a sea weed Sargassum muticum has been used to control corrosion of mild steel in 0.5 N HCl. Weight loss method and Electrochemical studies have been used in this study. Weight loss study reveals that 500 ppm of the inhibitor offers 99.25 % inhibition efficiency. Polarization study reveals that the inhibitor functions as an anodic inhibitor at higher concentration. The AC impedance spectra confirm the formation of a protective film on the metal surface. Adsorption of inhibitor molecules on the metal surface follows Langmuir adsorption isotherm.

scholarly journals CORROSION STUDY OF SS316L IN ENVIRONMENT SULPHUR ACID USING WEIGHT LOSS METHOD

SINERGI ◽  
2018 ◽  
Vol 22 (1) ◽  
pp. 24
Author(s):  
Ayu Arwati ◽  
Samsul Sianipar
Keyword(s):  
Mechanical Properties ◽  
Weight Loss ◽  
Electron Microscope ◽  
Corrosion Rate ◽  
Pitting Corrosion ◽  
Corrosion Resistant ◽  
Weight Loss Method ◽  
Acid Environment ◽  
Average Corrosion Rate ◽  
Loss Method

Application of SS 316 metal is commonly used as a building material in the chemical industry. This material is commonly used because it has good mechanical properties, corrosion resistant, but in reality, the SS 316 L metal can corrosive its acid environment, making it easy to solve the problem. corrosion. Therefore, this study is aimed to study SS316L corrosion level in H2SO4 acid by using weight loss method with 1 day, 3 days and 5 days immersion in H2SO4 environment with concentration 0,1 M, 0,3 M and 0,5 M The results showed that the corrosion rate increased with increasing concentration of H2SO4 and yield up to 5 days with average corrosion rate (CR) 2.729078 x 10-6 mpy. Morphological damage SS 316 L is demonstrated by SEM (Electron Microscope Scanning) there is a pitting corrosion on the metal surface

scholarly journals INVESTIGATION OF THE INHIBITIVE EFFECT OF AQUEOUS EXTRACT OF EUCALYPTUS LEAVES ON MILD STEEL IN ACIDIC MEDIA

2020 ◽  
Vol 45 (5) ◽  
Author(s):  
Ali Bilar ◽  
Benedict Christopher
Keyword(s):  
Weight Loss ◽  
Adsorption Isotherm ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Metal Surface ◽  
Physical Adsorption ◽  
Acidic Media ◽  
Eucalyptus Leaves ◽  
Weight Loss Method ◽  
Loss Method

The corrosion inhibition of mild steel in 0.5M H2SO4 and 1M HCl by leave extract of eucalyptus was studied using gravimetric (weight loss) method at various temperature. The results obtained showed that the efficiency of inhibition increases with increase in the extract concentrations and decreases with rise in temperature. The adsorption of plant extract on the mild steels was found to obey Longmuir adsorption isotherm. This could be due to physical adsorption of cation species on the metal surface.

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