scholarly journals Comparative Study on the Corrosion Behaviour of welded and un-welded Mild Steel in Agitated Media of Distilled Water 0.5mol, 0.3mol of Sodium Sulphate (Na2SO4) Solution

2020 ◽  
Vol 4 (2) ◽  
Keyword(s):  
Comparative Study ◽  
Mild Steel ◽  
Corrosion Behaviour ◽  
Research Work ◽  
Sodium Sulphate ◽  
General Corrosion ◽  
Distilled Water ◽  
Experimental Conditions ◽  
Analytical Instruments ◽  
Materials Used

The research work was based on the comparative study of the corrosion bebaviour of the mild steel using agitated distilled water with 0.5 mol and 0.3 mol of Na2SO4 solution. The materials used for the research work are welded and un-welded mild steel. The mild steel materials were obtained at the Foundry shop of the Ajaokuta Steel Company Limited. The mild steel materials were analyzed using the SPECTRO Analytical Instruments at the Foundry shop of the company. These experiments were performed using 0.5mol and 0.3mol of Na2SO4 in different agitated media of distilled water .The samples used for general corrosion studies were 10mm and 4mm mild steel thickness. These materials were cut into specimen sizes to 2cm by 2cm). Twenty -eight (28) specimens each were prepared for the 10mm and 4mm mild steel materials the samples were ground and polished on the emery papers which removed rust particles on the test materials. The specimens were exposed for days for over fifty –four (54) days, with an interval of 3days. It was observed that welded materials have higher corrosion rate than the un-welded materials when subjected to experimental conditions. The corrosion rates values were used to plot graphs against time of exposure.

Studies Concerning the Corrosion Behaviour of the Cast Stainless Steel Used for Chemical Industry

2013 ◽  
Vol 371 ◽  
pp. 338-342
Author(s):  
Gheorghe Simionescu ◽  
Mirela Gheorghian
Keyword(s):  
Chemical Industry ◽  
Room Temperature ◽  
Corrosion Behaviour ◽  
Research Work ◽  
Experimental Tests ◽  
Hot Environment ◽  
Chemical Agents ◽  
The Subject ◽  
Materials Used ◽  
Cast Stainless Steel

The current work deals with experimental tests concerning the behaviour of different materials used in chemical industry when are exposed to diverse corrosions environments. During the research work four different metals have been tested, namely T15NiCr180, T15MoNiCr180, W4027 and W4059. The presented work is trying to classify the tested materials function to different chemical environment, different concentration of the environment, different temperature of the environment, and different expose time. Some of the substances which were considered as corrosion environment are: HNO3, H3PO4, NaCl, NH4Cl, C2H5OH, Petrol, NH4NO3, KNO3, K2CO3, Na2CO3, KMnO4, KOH and Ca (OH)2. The concentration of the corrosion solutions varies between 1% and 96%. Tests have been done at room temperature and hot environment of 100°C. Time is playing an important role on evolution of the corrosion. For this reason the samples have been analyzed after 48, 336, 720 and 2160 hours of exposes to chemical agents. To understand the comportment of the subject metals when are used in industry, samples have been tested for longer period of time, respectively 1, 3, 6 and 12 months. After each selected period of time the metallic samples were analyzed and measured to quantify the effect of the environment on the corrosion speed.

Effects of Selected Media on Corrosion Behaviour of Mild Steel

2009 ◽  
Vol 62-64 ◽  
pp. 305-310
Author(s):  
B. Kareem
Keyword(s):  
Sodium Chloride ◽  
Mild Steel ◽  
Corrosion Behaviour ◽  
Low Carbon Steel ◽  
Lubricating Oil ◽  
Distilled Water ◽  
Low Carbon ◽  
Atmospheric Air ◽  
Test Pieces

In this study, investigations were carried out on the corrosion behaviour of low carbon steel (mild steel) in the selected media which are cassava extracts, sodium chloride solution (brine), lubricating oil, distilled water and atmospheric air. The test pieces, after chemical analysis were machined to similar dimensions. Each of the specimens was immersed into equal volumes of the selected media except one for the atmospheric air which was placed in the open air. The weight and hardness measurements were carried out every five days for a period of twenty-five days and loss in weight and hardness of the specimens were determined in succession. The results obtained showed that mild steel was more susceptible to corrosion in cassava extracts, sodium chloride and distilled water, than in lubricating oil and atmospheric air. Follow up statistical test results showed that loss in weight is significant for cassava extracts when compared with other media.

scholarly journals Corrosion Behaviour of Silver-Cobalt Oxide-Titanium Dioxide Nanocomposites Coated Mild Steel in Sea water

2020 ◽  
Vol 5 (2) ◽  
Author(s):  
Mohammed Ibrahim ◽  
Joseph B Agboola ◽  
Ambali S Abdulkareem ◽  
Oye Adedipe ◽  
Jimoh O Tijani
Keyword(s):  
Corrosion Resistance ◽  
Mild Steel ◽  
Cobalt Oxide ◽  
Sea Water ◽  
Corrosion Behaviour ◽  
Steel Substrate ◽  
Research Work ◽  
Cell System ◽  
Coated Sample ◽  
Positive Direction

The research work investigates the corrosion resistance of Silver-Cobalt Oxide-Titanium Dioxode (Ag/Co3O4/TiO2) nanocomposites coated mild steel (AISI 1020) in seawater environment. The coatings were carried out by dipping method. The nanoparticles were individually produced by mixing the salt precursors with extract of Piptadeniastrum africana leaf under the optimized synthesis conditions. The Ag/Co3O4/TiO2 nanocomposite was produced by mixing Ag, Co3O4 and TiO2 NPs in equal proportions to constitute 75 wt% of the composite. 10 wt % epoxy resin and its hardener in the ratio (1:1) were added to serve as the binder, while 15 wt% of CNT was introduced to serve as support. Phase and Microstructural examination of the coatings was carried out by XRD and HRSEM. The corrosion protection properties were determined by using computer- controlled EGG 273A Potentiostat with three- electrode cell system under static laboratory conditions using the linear potentiodynamic polarization method.  The coated sample was dried at temperatures of 100oC to enhance adherence of the coating on the steel substrate. The result of Tafel polarization plots revealed improved corrosion resistance of the coated specimen as compared to as-received sample. Corrosion rate and corrosion resistance of 0.201 m/y and 195.12 Ω were recorded against the coated sample while 0.261 m/y and 71.42 Ω were recorded for the as-received sample respectively. The coated sample exhibited higher potential shift in the positive direction and showed better corrosion resistance properties.Keywords- Nanocomposite, Mild steel, Corrosion, Potentio-Dynamic polarization, Seawater.

scholarly journals Hermann's phenomenon

1915 ◽  
Vol 91 (625) ◽  
pp. 134-147
Keyword(s):  
Electric Current ◽  
Sodium Sulphate ◽  
Boundary Effects ◽  
Distilled Water ◽  
Dilute Solution ◽  
Free Swimming ◽  
Experimental Conditions ◽  
Two Fluids ◽  
Physico Chemical ◽  
Striking Contrast

In 1887, Hermann published an account of some experiments from which he drew the conclusion that when an electric current passed from a dilute solution of a salt, such as sodium sulphate, to one more concentrated, a liberation of acid took place at the boundary layer between the two fluids; also, that when the current passed in the opposite direction alkali was liberated at the same place. This experimental difficulties were considerable, but the facts were firmly established, though it is only to he expected that their repetition and amplification to-day should suggest another interpretation to that put for ward 27 years ago. Strangely enough, although these phenomena were cited by early physiologist as affording an explanation of the "electrical taste," they have quite escaped all the later text-hoofs and articles on physico-chemical subjects. Rosenthal's experiments, which showed that the "electrical taste" was not to be attributed directly to electrolytic phenomena, may have led to a general but mistaken impression that Hermann's observations were faulty. In explaining the habits of certain free-swimming protocoa, however, vale has attributed the directive stimuli to these boundary effects. The cogency of these speculations is in striking contrast to the earlier applications of Hermann's experiments to physiological problems. In a paper on the cataphoresis of ferments, too, V. Henri has alluded to the liberation of alkali and acid at the boundaries of the ferment solution and distilled water when an electric current is passed. This, as he remarks, cannot he avoided by the use of non-polarisable electrodes, but may he overcome by dialysing the enzyme solution until it has the same conductivity as the distilled water employed. It may be pointed out, in passing, that this undesirable restriction to the experimental conditions is not necessary; it is only essential that the specific conductivities of the two solutions should be the same. But, since the published work in which this precaution has not been taken would otherwise he not properly understood, it was decided to investigate the significance of these boundary complications in their relationship to transport experiments generally.

An experimental investigation of Top of Line Corrosion in a static CO<sub>2</sub> environment

CORROSION ◽  
10.5006/3548 ◽  
2021 ◽  
Author(s):  
Sheyla de Carvalho ◽  
Richard Barker ◽  
MARIANA FOLENA ◽  
Mohaamed Al-Khateeb ◽  
JOSE ANTONIO PONCIANO GOMES ◽  
...  
Keyword(s):  
Mass Loss ◽  
Gas Flow ◽  
Corrosion Behaviour ◽  
General Corrosion ◽  
Condensation Rate ◽  
Experimental Conditions ◽  
Corrosion Rates ◽  
Water Condensation ◽  
Surface Temperatures

&lt;i&gt;This paper presents an experimental and theoretical investigation into water condensation and corrosion under non-corrosion product forming conditions at the top of line in a static, CO&lt;sub&gt;2 &lt;/sub&gt;environment. An experimental test cell is developed to measure droplet lifetimes, condensation rates, as well as in situ and integrated corrosion rates (using miniature electrodes and mass loss specimens, respectively), as a function of the surface and gas temperatures, when the gas flow is dominated by natural convection. Experimental results show clearly that that water condensation rate (WCR) is not very influential on corrosion rate at low surface temperatures (T&lt;sub&gt;s&lt;/sub&gt;) (particularly below 25&lt;sup&gt;o&lt;/sup&gt;C) but becomes much more important at higher surface temperatures (&gt;40&lt;sup&gt;o&lt;/sup&gt;C). These findings are summarised in a new empirical correlation for TLC rate as a function of the condensation rate and surface temperature. A model for condensation at the top of the line for static, buoyancy-driven conditions is also presented and is shown to predict dropwise condensation rates accurately for a range of experimental conditions. The developed miniature electrodes for in situ electrochemical measurement are shown to provide an accurate interpretation of the transient response in general corrosion behaviour by giving real-time corrosion rates to complement the mass loss measurement.&lt;/i&gt;

The Effects of Carbonate-Bicarbonate Concentration on Empirical Corrosion Diagram of Mild Steel as a Material of Geological Disposal Package for High Level Nuclear Wastes

1996 ◽  
Vol 451 ◽  
Author(s):  
Guen Nakayama ◽  
Yuichi Fukaya ◽  
Masatsune Akashi
Keyword(s):  
Mild Steel ◽  
Human Life ◽  
General Corrosion ◽  
Nuclear Wastes ◽  
Bicarbonate Concentration ◽  
Sulfate Ions ◽  
Geological Disposal ◽  
Groundwater Environment ◽  
High Level ◽  
Corrosion Diagram

ABSTRACTIn the scheme for geological disposal of high level radioactive nuclear wastes, the burial pit is to be isolated from the sphere of human life by a multiple-barrier system, which consists of an artificial barrier, composed of a canister, an overpack and a bentonite cushioning layer, and a natural barrier, which is essentially the bedrock. As the greatest as well as essentially the sole detriment to its integrity would be corrosion by groundwater. The groundwater comes to it seeping through the bentonite zone, thereby attaining conceivably the pH of transition from general corrosion to passivity, pHd, the behaviors of mild steel in such a groundwater environment have been examined. It has been shown that the pHd is lowered (enlargement of the passivity domain) with rising temperature and carbonate-bicarbonate concentration, while it is raised (enlargement of the general corrosion region) with increasing concentrations of chloride and sulfate ions.

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