Corrosion Susceptibility of a 0.35%C Steel in Seawater Electrolyte Using the Electrochemical Method

2016 ◽  
Vol 27 ◽  
pp. 20-26
Author(s):  
Ayodele Samuel Adeniyi ◽  
Mary Ajimegoh Awotunde
Keyword(s):  
Corrosion Rate ◽  
Linear Polarization ◽  
Electrode Potential ◽  
Electrochemical Method ◽  
Sea Water ◽  
Anodic Current ◽  
Potential Value ◽  
Heat Treated ◽  
Seawater Environment ◽  
Corrosion Susceptibility

The Tafel extrapolation and linear polarization methods were used as effective measures for determining the corrosion susceptibility of a spheroidized 0.35%C steel with sea water as the electrolyte. Eight pieces of steel were machined to length 5mm by 10mm in diameter. Two pieces each were heat treated at 600°C, 700°C and 800°C respectively and two pieces left as control. Electro-chemical experiments were carried out to obtain the best potential and anodic current of samples immersed in an electrolyte (seawater) at varying anodic potential of-0.7mv, -0.6mv, -0.5mv and-0.4mv respectively. The results showed that the sample with the least corrosion rate were the samples spheroidized at 700°C. They appeared to have the highest electrode potential value of-0.6mv and 800°C spheroidized samples had the least electrode potential value of-0.65mv at the end of 2000seconds respectively. From the results obtained, the samples spheroidized at 700°C appeared to be most suitable for seawater environment.

Contribution of electrolysis current to growth of SrTiO3 thin film by the hydrothermal-electrochemical method

1994 ◽  
Vol 9 (8) ◽  
pp. 2109-2117 ◽  
Author(s):  
Koji Kajiyoshi ◽  
Kunisaburo Tomono ◽  
Yukio Hamaji ◽  
Toru Kasanami ◽  
Masahiro Yoshimura
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Current Efficiency ◽  
Electrode Potential ◽  
Electrochemical Method ◽  
Film Growth ◽  
Reaction Model ◽  
Total Current ◽  
Anodic Current ◽  
Hydrothermal Electrochemical Method

The electrolysis treatment of the hydrothermal-electrochemical method has been modified so that it permits SrTiO3 thin films to be grown on Ti electrodes being oxidized anodically in Sr(OH)2 solutions far beyond a thickness limit of several tens of nanometers hitherto attained. The relation between the total current passed through the Ti anode and the amount of the resulting SrTiO3 film was analyzed on the basis of a reaction model that interprets the anodic current to be compensated with electrons generated partly by oxidation of Ti and partly by decomposition of H2O. Current efficiency for the film growth was estimated to be in the range from 0.8 to 3% depending on the Ti electrode potential.

Microbial Effects on Heat Treated 316L Weldments in Marine Water

2013 ◽  
Vol 794 ◽  
pp. 606-617
Author(s):  
Kripa Suvarna ◽  
K. Rajendra Udupa ◽  
A.O. Surendranathan
Keyword(s):  
Corrosion Rate ◽  
Weld Metal ◽  
Sea Water ◽  
Corrosion Behaviour ◽  
Electrochemical Behaviour ◽  
Austenitic Stainless Steels ◽  
Microbiologically Influenced Corrosion ◽  
Localized Corrosion ◽  
Material Surface ◽  
Heat Treated

Austenitic stainless steels are susceptible to microbiologically influenced corrosion (MIC) when they are in contact with sea water. This is due to the changes in the chemistry of the environment at the metal surface because of the settlement and activities of microorganisms. The thrust of our work was in understanding the changes in the electrochemical behaviour of a type 316L stainless steel in the presence of a natural biofilm as well as the influence of metallurgical characteristics on microbial adhesion and MIC. The presence of a biofilm on material surface can influence the corrosion behaviour since the value of a given parameter such as temperature, pressure, concentration of a solute and pH at the water /substrate interface under the biofilm may be different from that in the bulk environment. The non-uniform nature of biofilm thus helps in generating heterogeneity in the environment at the surface. Thus, biofilms are known to aid in the initiation of corrosion, change the mode of corrosion or cause changes in the corrosion rate. Bacteria Arthobacter nicotinae (An) and algae Chlorella pyrenoidosa (Cp) were used for the study and bio film formed due to these showed pit initiation and increase in corrosion rate as time proceeds. 316L base metal (BM) and weld metal (WM) as received and after heat treated at 450°C for 10000 hours were studied and corrosion evaluation was done. Heat treated WM showed severe response to corrosion compared to as received WM. Key Words: MIC, AISI 316L SS, biofilm, weld metal, localized corrosion.

scholarly journals Efficiency of Ketapang (Terminalia catappa L.) Leaves Tannin Extract as Organic Inhibitor Against Corrosion Rate of Iron Metal in Seawater

2020 ◽  
Vol 2 (1) ◽  
pp. 63-69
Author(s):  
Eddy Marlianto
Keyword(s):  
Corrosion Rate ◽  
Immersion Time ◽  
Leaf Extract ◽  
Sea Water ◽  
Corrosive Media ◽  
Terminalia Catappa ◽  
Iron Metal ◽  
Ferrous Metals ◽  
Seawater Environment ◽  
Organic Inhibitor

The research is about effect of immersion time and mechanical properties on the rate of corrosion of ferrous metals by the addition of Ketapang (Terminalia catappa L.) leaf extract as an organic inhibitor in the seawater environment. In this study, ketapang leaf extract was used as a natural inhibitor to inhibit the rate of corrosion of ferrous metals. This inhibitor is used on iron metal plates which are immersed in corrosive media, namely sea water with variations in the composition of the inhibitors used at 0; 10% V; 20% V, and 40% V, with immersion time of 3 and 6 days. The characterizations tested included measurement of density, corrosion rate, inhibitor efficiency, and hardness testing using the Vickers method. From the measurement results, the density value decreases with the addition of the concentration of the inhibitor both on immersion 3 days and 6 days. The value of hardness increases with increasing composition of the inhibitor. The optimum hardness value is 165.03 N/m2 with immersion time of 6 days at an inhibitor concentration of 40% and a minimum hardness value of 145.603 N/m2 on immersion 6 days with no inhibitor. The smallest corrosion rate was obtained by samples with a composition of 40% inhibitor of 2.77 mpy with immersion time of 3 days and 1.33 mpy with immersion time of 6 days. And the efficiency value of Ketapang leaf extract inhibitors reached 47.01 % in the composition of 40% in the seawater environment with immersion time of 6 daysketapang leaves

Effect of Sn, Zn and Bi Addition on Corrosion Characteristics of Magnesium Alloys Sintered by Spark Plasma Sintering

2018 ◽  
Vol 941 ◽  
pp. 1760-1765
Author(s):  
Satoshi Sunada ◽  
Yoshitaka Matsui ◽  
Syogo Takeuchi ◽  
Taku Iwaoka ◽  
Koichi Sato ◽  
...  
Keyword(s):  
Melting Point ◽  
Corrosion Rate ◽  
Spark Plasma Sintering ◽  
Magnesium Alloys ◽  
Electrochemical Method ◽  
Corrosion Potential ◽  
Elemental Mapping ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Metallic Compounds

Sintered magnesium alloys, which were fabricated by Spark Plasma Sintering (SPS) method, were examined to study corrosion characteristics by electrochemical method, XRD and EPMA. The binary mixtures alloys of a low-melting-point metal powder (Sn, Bi, Sb) of1.0 vol.% and the pure magnesium powder were prepared. In the Mg-1.0vol.%Bi and Mg-1.0vol.%Sn, Mg3Bi2 and Mg2Sn precipitates was recognized by XRD, respectively. In addition, formation of oxide along powder particle boundaries was observed by EPMA elemental mapping in all specimens. In the case of Mg-1.0vol.%Zn, precipitation of metallic compounds was not recognized by these experiments. According to the results of polarization curve measurements, the Mg-1.0vol.%Bi shows highest corrosion potential. However, corrosion rate which was estimated by Tafel method is relatively larger than other alloys due to Mg3Bi2 precipitation. This result suggests that Mg3Bi2 acts as cathode site. The Mg-1.0vol.%Sn shows superior corrosion rale in these alloys.

scholarly journals THE EFFECT OF BEACH ENVIRONMENT AND SEA WATER ON NICKEL CORROSION RATE AS A COLLIMATOR MATERIAL FOR THE APPLICATION OF BORON NEUTRON CAPTURE THERAPY

2019 ◽  
Vol 21 (3) ◽  
pp. 127
Author(s):  
Hardi Hidayat ◽  
Budi Setyahandana ◽  
Yohannes Sardjono ◽  
Yulwido Adi
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Boron Neutron Capture Therapy ◽  
Neutron Capture ◽  
Sea Water ◽  
Base Material ◽  
Coastal Environment ◽  
Corrosion Testing ◽  
Neutron Capture Therapy ◽  
Boron Neutron Capture

The purpose of this study is to determine the value of corrosion rate influenced by coastal environment and seawater to nickel as a collimator base material for the application of boron neutron capture therapy (BNCT). In this research, the authors used 99.9% pure nickel as the reference material. Corrosion testing was carried out to determine the rate of corrosion of nickel as a base material for BNCT. After the specimens were formed, the test specimens were then corroded for 12 weeks, with various conditions such as indoor, outdoor environment, static seawater, and moving seawater. The results of this study indicated that in corrosion testing with indoor condition, the corrosion rate values are 0.61-1.00 mpy. For outdoor condition, the corrosion rate is 0.89-1.34 mpy. Meanwhile, at static seawater conditions, the corrosion rate is 0.97-1.24 mpy. Lastly, for moving seawater condition, the corrosion rate is 1.64-1.91 mpy. The results showed that corrosion resistance was relatively the same for all nickel exposed to corrosion in the coastal environment. Therefore, in regards to corrosion resistance, using nickel as a collimator base material for BNCT applications is considered as safe.Keywords: BNCT, Nickel, Corrosion, Coastal Environtment, Sea Water

scholarly journals Effect Use of Two Chemical Compounds Sodium Nitrate and Sodium Silicate as Corrosion Inhibitor to Steel Reinforcement

2019 ◽  
Vol 14 (2) ◽  
pp. 123-128
Author(s):  
Sarah Kareem Mohammed
Keyword(s):  
Corrosion Rate ◽  
Sodium Silicate ◽  
Electrolyte Solution ◽  
Sodium Nitrite ◽  
Corrosion Inhibitors ◽  
Sea Water ◽  
Chemical Compounds ◽  
Steel Sample ◽  
Steel Reinforcement ◽  
Corrosion Of Steel

Corrosion of steel reinforcement is one of the biggest problems facing all countries in the world like bridges in the beach area and marine constructions which lead to study these problems and apply some economical solutions. According to the high cost of repair for these constructions, were studied the effect of using kind of chemical compounds sodium nitrite(NaNO2) and sodium silicate(Na2SiO3) as corrosion inhibitors admixture for steel bars that immersed partially in electrolyte solution (water + sodium chloride in 3% conc.) (Approximately similar to the concentration of salt in sea water). The two inhibitors above added each one to the electrolyte solution at concentrations (0.5%, 1% and 2%) for both of them.      The results were  corrosion rate for steel sample that's immersed partially in salt solution was higher than corrosion rate of steel bar that's immersed partially in electrolyte solution with inhibitors  also the two corrosion inhibitors (sodium nitrite and sodium silicate) that added to the electrolyte solution were working successfully to prevent and inhibit the corrosion by using weight loss technique with best percent of 0.5% sodium nitrite ( efficiency 94.1% ) and best percent of 2% sodium silicate ( efficiency 92.5%).

Influence of Mineral Admixtures on Corrosion Rate of Reinforced Steel in Concrete

2014 ◽  
Vol 711 ◽  
pp. 430-433
Author(s):  
Hai Hong Li ◽  
Zhi Hong Fan ◽  
Peng Ping Li
Keyword(s):  
Corrosion Rate ◽  
Linear Polarization ◽  
Mineral Admixtures ◽  
Reinforcing Steel ◽  
Polarization Method ◽  
Reinforced Steel ◽  
The Relationship

A linear polarization method was applied to measure corrosion rate of reinforced steel in concrete. The relationship between corrosion rate and mineral admixtures was discussed. The results show that changes of mineral admixtures material will affect the corrosion rate of reinforcing steel in concrete, of which slag is the most obvious.

Study on the Flow- Induced Corrosion of P110 Oil Tube with an Electrochemical Method

2013 ◽  
Vol 683 ◽  
pp. 396-399
Author(s):  
Zhi Guo Wang ◽  
Zhen Li ◽  
Xiao Yan Liu ◽  
Yi Hua Dou
Keyword(s):  
Corrosion Rate ◽  
Flow Velocity ◽  
Electrochemical Method ◽  
Fluid Velocity ◽  
Impact Angle ◽  
Nacl Solution ◽  
Cathode Reaction ◽  
Flow Induced Corrosion ◽  
P110 Steel ◽  
The Impact

P110 Steel Flow-induced corrosion Electrochemical Method Abstract. Electrochemical measurements have been used to investigate the flow-induced corrosion behaviors of P110 oil tube in 3.5wt% NaCl solution. The corrosion rates were calculated by linear polarization resistance method and weak polarization method respectively. The results demonstrated that corrosion rate of P110 steel increases sharply with the flow velocity increase when the impact angle is 30°, but it reach the first plateau when the fluid velocity changes from 5.6 m/s to 7.8 m/s and the corrosion rate increases sharply again when the velocity beyond 7.8 m/s. After that, corrosion rate decrease when the velocity is more than 10.0m/s. It is demonstrated that the corrosion rate of steel P110 is controlled by cathode reaction of oxygen diffusion in the 3.5 wt % NaCl solution when the flow velocity is over 10.0m/s.

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