Electrochemical Investigations of Microbiologically Influenced Corrosion on 316L-Cu Stainless Steel by Pseudoalteromonas lipolytica

2020 ◽  
Vol 12 (2) ◽  
pp. 191-199 ◽  
Author(s):  
Phuri Kalnaowakul ◽  
Trinet Yingsamphancharoen ◽  
Ke Yang ◽  
Dake Xu ◽  
Aphichart Rodchanarowan
Keyword(s):  
Corrosion Current Density ◽  
Marine Bacterium ◽  
Induction Furnace ◽  
Cooling Water ◽  
Corrosion Current ◽  
Water Systems ◽  
Electrochemical Analysis ◽  
Microbiologically Influenced Corrosion ◽  
Vacuum Induction Furnace ◽  
Corrosion Resistant

Microbiologically influenced corrosion (MIC) is becoming more often a risk factor in several industries, such as offshore, cooling water systems and construction. The Pseudoalteromonas lipolytica (P. lipolytica) is a highly corrosive aerobic marine bacterium. In this work, the 316L-Cu SS was investigated the corrosion behavior under the abiotic medium and biotic medium of P. lipolytica. Based on the electrochemical analysis, the corrosion current density (icorr) under the biotic medium is higher than that under the abiotic medium. The presence of P. lipolytica has led to the dissolution of the passive film of 316L-Cu SS, which initiates the localized pitting corrosion. However, the addition of Cu in 316L SS by melting in the vacuum induction furnace improved more corrosion-resistant than without the addition of Cu.

Characterizing biofilms for biofouling and microbial corrosion control in cooling water systems

2016 ◽  
Vol 63 (6) ◽  
pp. 477-489 ◽  
Author(s):  
R.P. George ◽  
U. Kamachi Mudali ◽  
Baldev Raj
Keyword(s):  
Biofilm Formation ◽  
Corrosion Behaviour ◽  
Control Strategies ◽  
Bacterial Species ◽  
Cooling Water ◽  
Water Systems ◽  
Microbiologically Influenced Corrosion ◽  
Mitigation Measures ◽  
Content Type ◽  
Physiological Diversity

Purpose The purpose of this paper is to study the metal-Microbe interaction playing a crucial role in microbiologically influenced corrosion (MIC) and biofouling of materials in cooling water systems. Treatment regimens should be planned based on this understanding. Design/methodology/approach Attempts were made in the past decades to characterize and understand biofilm formation on important power plant structural materials such as carbon steel (CS), stainless steel (SS) and titanium in fresh water and in seawater to achieve better control of biofouling and minimize MIC problems. Findings This report presents the results of detailed studies on tuberculation-formed CS because of the action of iron-oxidizing bacteria and the effects of algae- and bacteria-dominated biofilms on the passivity of SS. The preferential adhesion of different bacterial species on SS under the influence of inclusions and sensitization was studied in the context of preferential corrosion of SS weldments due to microbial action. Detailed characterization of biofilms formed on titanium (the likely condenser material for fast breeder reactors) after exposure for two years in Kalpakkam coastal waters revealed intense biofouling and biomineralization of manganese even in chlorinated seawater. Studies on the effectiveness of conventional fouling control strategies were also evaluated. Originality/value The detailed studies of different metal/biofilm/microbe interactions demonstrated the physiological diversity of microbes in the biofilms that were formed on different materials, coupling their cooperative metabolic activities with consequent corrosion behaviour. These interactions could enhance either anodic or cathodic reactions and exploit metallurgical features that enhance biofilm formation and/or the capacity of microbes to mutate and overcome mitigation measures.

The Electrochemical Analysis of Trace Titanium Addition to the High Pure Zinc Electrode in Seawater

2013 ◽  
Vol 662 ◽  
pp. 379-382
Author(s):  
Li Juan Sun ◽  
Hu Yuan Sun ◽  
Kun Cao ◽  
Rui Hua Yan
Keyword(s):  
Corrosion Current Density ◽  
Corrosion Current ◽  
Titanium Content ◽  
Electrochemical Analysis ◽  
Zinc Electrode ◽  
Electrochemical Characteristic ◽  
Characteristic Difference ◽  
Titanium Addition ◽  
Pure Zinc ◽  
Potential Stability

High pure zinc with trace titanium of various contents was prepared by the method of master alloy preparation, and electrochemical characteristic difference in seawater was discussed. The result reveals that there is a minimum of self corrosion current density at 0.04% titanium content in high pure zinc in seawater of Qingdao seashore, and trace addition of titanium may increases the potential stability but not change the corrosion behavior of high pure zinc in seawater.

Fluorescent-tagged no phosphate and nitrogen free calcium phosphate scale inhibitor for cooling water systems

2009 ◽  
Vol 113 (3) ◽  
pp. 1966-1974 ◽  
Author(s):  
Kun Du ◽  
Yuming Zhou ◽  
Liuqian Wang ◽  
Yingying Wang
Keyword(s):  
Calcium Phosphate ◽  
Cooling Water ◽  
Water Systems ◽  
Free Calcium ◽  
Scale Inhibitor

scholarly journals An electrochemical method to investigate the effects of compound composition on gold dissolution in thiosulfate solution

2020 ◽  
Vol 9 (1) ◽  
pp. 496-502 ◽  
Author(s):  
Zhaohui Zhang ◽  
Bailong Liu ◽  
Mei Wu ◽  
Longxin Sun
Keyword(s):  
Dissolution Rate ◽  
Current Density ◽  
Polarization Resistance ◽  
Electrochemical Method ◽  
Corrosion Current Density ◽  
Corrosion Potential ◽  
Corrosion Current ◽  
Gold Dissolution ◽  
Tafel Polarization ◽  
Edta Solution

AbstractThe electrochemical behavior of gold dissolution in the Cu2+–NH3–S2O32−–EDTA solution has been investigated in detail by deriving and analyzing the Tafel polarization curve, as this method is currently widely implemented for the electrode corrosion analysis. The dissolution rate of gold in Cu2+–NH3–S2O32−–EDTA solution was determined based on the Tafel polarization curves, and the effects of various compound compositions in a Cu2+–NH3–S2O32−–EDTA mixture on the corrosion potential and corrosion current density were analyzed. The results showed that the corrosion potential and polarization resistance decreased, whereas the corrosion current density increased for certain concentrations of S2O32−–NH3–Cu2+ and EDTA, indicating that the dissolution rate of gold had changed. The reason for promoting the dissolution of gold is also discussed.

scholarly journals Corrosion Behavior and Osteogenic Activity of a Biodegradable Orthopedic Implant Mg–Si Alloy with a Gradient Structure

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 781
Author(s):  
Weiyan Jiang ◽  
Wenzhou Yu
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Polarization Resistance ◽  
Corrosion Current Density ◽  
Corrosion Current ◽  
Gradient Structure ◽  
Orthopedic Implant ◽  
Biological Functions ◽  
Alloy Matrix ◽  
Osteogenic Activity

A gradient Mg-8 wt % Si alloy, which was composed of the agglomerated Mg2Si crystals coating (GMS8-1) and the eutectic Mg–Si alloy matrix (GMS8-2), was designed for biodegradable orthopedic implant materials. The bio-corrosion behavior was evaluated by the electrochemical measurements and the immersion tests. The results show that a significant improvement of bio-corrosion resistance was achieved by using the gradient Mg–Si alloy, as compared with the traditional Mg-8 wt % Si alloy (MS8), which should be attributed to the compact and insoluble Mg2Si phase distributed on the surface of the material. Especially, GMS8-1 exhibits the highest polarization resistance of 1610 Ω, the lowest corrosion current density of 1.7 × 10−6 A.cm−2, and the slowest corrosion rate of 0.10 mm/year. In addition, GMS8-1 and GMS8-2 show better osteogenic activity than MS8, with no cytotoxicity to MC3T3-E1 cells. This work provides a new way to design a gradient biodegradable Mg alloys with some certain biological functions.

scholarly journals Microstructure of Al-5Cu-1Li-0.6Mg-0.5Ag-0.5Mn Alloys

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 37
Author(s):  
Wenzheng Chen ◽  
Wenlong Zhang ◽  
Dongyan Ding ◽  
Daihong Xiao
Keyword(s):  
Mechanical Properties ◽  
Corrosion Current Density ◽  
Corrosion Potential ◽  
Aging Treatment ◽  
Corrosion Current ◽  
Homogenization Temperature ◽  
Tafel Polarization ◽  
Al2cu Phase ◽  
Different Temperatures ◽  
Microstructural Optimization

Microstructural optimization of Al-Li alloys plays a key role in the adjustment of mechanical properties as well as corrosion behavior. In this work, Al-5Cu-1Li-0.6Mg-0.5Ag-0.5Mn alloy was homogenized at different temperatures and holding times, followed by aging treatment. The microstructure and composition of the homogenized alloys and aged alloys were investigated. There were Al7Cu4Li phase, Al3Li phase, and Al2CuLi phases in the homogenized alloys. The Al7Cu4Li phase was dissolved with an increase in homogenization temperature and holding time. Al2Cu phase and Al2CuLi phase coarsened during the homogenization process. The alloy homogenized at 515 °C for 20 h was subjected to a two-stage aging treatment. Peak-age alloy, which had gone through age treatment at 120 °C for 4 h and 180 °C for 6 h, was mainly composed of α-Al, Al20Cu2Mn3, Al2CuLi, Al2Cu, and Al3Li phases. Tafel polarization of the peak-age alloys revealed the corrosion potential and corrosion current density to be −779 mV and 2.979 μA/cm2, respectively. The over-age alloy had a more positive corrosion potential of −658 mV but presented a higher corrosion current of 6.929 μA/cm2.

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