scholarly journals Corrosion behavior of austempered ductile iron (ADI) in iron ore slurry

1970 ◽  
Vol 8 (3) ◽  
pp. 7-12
Author(s):  
M. Pooja ◽  
V. Vijeesh ◽  
A. O. Surendranathan ◽  
K. R. Udupa ◽  
K. G. Samuel
Keyword(s):  
Weight Loss ◽  
Corrosion Behavior ◽  
Ductile Iron ◽  
Iron Ore ◽  
Austempered Ductile Iron ◽  
Complex Nature ◽  
Weight Loss Method ◽  
Higher Temperature ◽  
Loss Method ◽  
Lower Temperature

Corrosion behavior of austempered ductile iron (ADI) in iron ore slurry was studied as a function of the microstructure developed by austempering at 380 and 300°C for different exposure time in the slurry. The corrosion rates of the ADI balls immersed in the iron ore slurry was determined using weight loss method. It was found that the pH of the iron ore slurry increased with time and the corrosion behavior is also influenced by the pH of the slurry and the austempering treatment. The ADI austempered at higher temperature showed better corrosion resistance than the ones austempered at lower temperature. The complex nature of corrosion of ADI is influenced by contents of retained austenite, ferrite and the carbon content in a collective way.Keywords: Austempered ductile iron, iron ore slurry, weight-loss method

Investigation on the Corrosion Behavior of Zn27Al3Cu Alloy in 3.5 wt.% NaCl Solution

2012 ◽  
Vol 482-484 ◽  
pp. 537-540
Author(s):  
Yong Tan ◽  
Cheng Gang Hao ◽  
De Zhi Li ◽  
Zhi Liu Hu ◽  
Jian Min Zeng
Keyword(s):  
Weight Loss ◽  
Corrosion Behavior ◽  
Corrosion Products ◽  
Corrosion Mechanism ◽  
Attenuation Relationship ◽  
Nacl Solution ◽  
Cu Alloy ◽  
Weight Loss Method ◽  
Loss Method ◽  
Scanning Electron

The corrosion behavior of Zn27Al3Cu in 3.5 Wt.% NaCl solution is investigated through weight loss method. The morphology of corrosion products were observed and analyzed with optical microscopy (OM), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The experimental results indicate that weight loss of the alloy with time follows the exponential attenuation relationship. Corrosion mechanism of Zn27Al3Cu alloy are intergranular corrosion and preferential corrosion in 3.5 Wt.% NaCl solution, the main corrosion products are compound oxide and chloride.

scholarly journals Corrosion Behavior of a Nickel-Base Dental Casting Alloy in Artificial Saliva Studied by Weight Loss and Polarization Techniques

2019 ◽  
Author(s):  
Elnaz Moslehifard ◽  
Mahsa Moslehifard ◽  
Sanaz Ghasemzadeh ◽  
Farzad Nasirpouri
Keyword(s):  
Weight Loss ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Base Alloy ◽  
Artificial Saliva ◽  
Ph Values ◽  
Significant Difference ◽  
Weight Loss Method ◽  
Loss Method ◽  
Nickel Base

Objectives: Nickel-chromium (Ni-Cr) base dental alloys with desirable properties have been employed in prosthodontics for years. Corrosion behavior of a Ni-Cr base alloy in artificial saliva with different pH values is determined in this work. Materials and Methods: Corrosion behavior of Ni-Cr alloy was studied using weight loss described by corrosion rate (CR) in mils per year (mpy) and potentiodynamic polarization described by corrosion potential (CP) in mV and current density (CD) in mA/cm2 in artificial saliva with different pH. Surface morphology was studied using scanning electron microscopy (SEM). Statistical difference was assessed using one-way ANOVA and post-hoc Tukey's honestly significant difference (HSD) test with a difference significance of 95%. Results: In weight loss method, CR was 71.95±3.40, 17.26±1.03, 8.92±0.35, and 6.93±0.54 mpy at pH values of 2.5, 5, 7, and 9, respectively. CR obtained at pH of 2.5 was significantly different than that in other groups, but those obtained at pH of 5, 7, and 9 were not significantly different. In the polarization method, CP values were significantly different. CD measured at pH of 2.5 and 5 was significantly different than the rest of pH values (P<0.05). CRs at pH of 7 and 9 were not significantly different. SEM exhibited the formation of preferential sites of corrosion attacks influenced by pH. Conclusions: Both techniques revealed consistent results. Corrosion resistance increases as pH increases towards less acidic conditions. In more acidic saliva, the corrosion rate is greater. The less acidic saliva leads to formation of a more stable passive film on Ni, and the dissolution of Ni decreases, leading to lower CRs.

Corrosion Behavior of AZ91/AZ91-0.4%Nd Alloys in 3.5wt.% NaCl

2013 ◽  
Vol 291-294 ◽  
pp. 699-702
Author(s):  
Ju Mei Zhang ◽  
Zhi Hu Wang ◽  
Hui Cai ◽  
Ming Zhu ◽  
Li Bin Niu
Keyword(s):  
Weight Loss ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Immersion Test ◽  
Grain Refining ◽  
Az91 Magnesium Alloy ◽  
Weight Loss Method ◽  
Az91 Magnesium ◽  
Loss Method

The microstructure and corrosion behavior of commercial AZ91/AZ91-0.4%Nd alloys were investigated by OM, immersion test and weight-loss method. It was found that the number of Nd element in the AZ91 magnesium alloy has effect on the grain refining efficiency, the coarse β-Mg17Al12phase distributed along the grain boundaries transformed into granular, and the granular or acicular Al3Nd phase precipitated in matrix. The addition of Nd element significantly reduces the corrosion rate of AZ91-0.4%Nd magnesium alloy, as a result the corrosion resistance of alloy was improved obviously.

scholarly journals Corrosion behavior of austempered ductile iron (ADI) in iron ore slurry

2016 ◽  
Vol 8 (3) ◽  
pp. 7 ◽  
Author(s):  
M. Pooja ◽  
V. Vijeesh ◽  
A. O. Surendranathan ◽  
K. R. Udupa ◽  
K. G. Samuel
Keyword(s):  
Corrosion Behavior ◽  
Ductile Iron ◽  
Iron Ore ◽  
Austempered Ductile Iron

Influence of Magnetic Field on the Mechanical Properties of Austempered Ductile Iron (ADI)

2007 ◽  
Vol 539-543 ◽  
pp. 4657-4662
Author(s):  
Susil K. Putatunda
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
High Magnetic Field ◽  
Ductile Iron ◽  
Austempered Ductile Iron ◽  
Quenching Media ◽  
Fine Grain ◽  
Higher Temperature ◽  
Lower Temperature ◽  
Novel Concept

A novel concept of two-step austempering in a magnetic field has been conceived by this investigator. This twostep process involves first quenching the alloy to a lower temperature after austenitizing and then immediately rising the temperature of the quenching media to a higher temperature and the whole austempering process is carried out in the presence of a high magnetic field. In this investigation, Austempered Ductile Iron (ADI) was processed by this novel two-step austempering process in a high magnetic field of 20 Tesla. The microstructure and the mechanical properties of the ADI processed in a magnetic field has been characterized and compared with ADI processed by conventional process. The results of this investigation indicate significant improvement in the mechanical properties of ADI when Austempered in a high magnetic field. Both yield and tensile strengths were higher in the samples processed in the presence of a magnetic field. Very fine grain ferrite and austenite was obtained in the microstructure. The ferrite content was also significantly higher.

Corrosion Behavior of High and Low Temperature Austempered Ductile Iron (ADI) in Iron Ore Slurry

2017 ◽  
Vol 6 (1) ◽  
pp. 20160070 ◽  
Author(s):  
Pooja M. Aithal ◽  
Vijeesh Vijayan ◽  
A. O. Surendranathan ◽  
K. R. Udupa ◽  
K. G. Samuel
Keyword(s):  
Low Temperature ◽  
Corrosion Behavior ◽  
Ductile Iron ◽  
Iron Ore ◽  
Austempered Ductile Iron

scholarly journals Effect of Piperidin-4-ones on the Corrosion Inhibition of Mild Steel in 1 N H2SO4

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Glory Tharial Xavier ◽  
Brindha Thirumalairaj ◽  
Mallika Jaganathan
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Steel Specimen ◽  
Sulphuric Acid Solution ◽  
Effect Of Temperature ◽  
Weight Loss Method ◽  
Loss Method

The corrosion inhibition of mild steel in 1 N sulphuric acid solution by 2,6-diphenylpiperidin-4-ones with various substituents at 3- and 3,5-positions (01–06) has been tested by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopic methods, and FTIR and UV absorption spectra. The surface morphology of the mild steel specimen has been analyzed by SEM. The effect of temperature (300 to 323 ± 1 K) on the corrosion behavior of mild steel in the presence of the inhibitors (01–06) was studied using weight loss techniques. The effect of anions (Cl−, Br−, and I−) on the corrosion behavior of mild steel in the presence of the same inhibitors was also studied by weight loss method and the synergism parameters were calculated. The adsorption characteristics of the inhibitors have been determined from the results.

A Note on Groove Depth Changes Without Wear

1980 ◽  
Vol 8 (1) ◽  
pp. 10-12
Author(s):  
F. C. Brenner
Keyword(s):  
Weight Loss ◽  
Wear Test ◽  
Groove Depth ◽  
High Rate ◽  
Weight Changes ◽  
Wear Rates ◽  
Weight Loss Method ◽  
Loss Method ◽  
And Storage ◽  
Low Rate

Abstract Tread wear rates during first wear measured by groove depth and weight changes do not always agree. Sometimes, the groove depth method shows a high rate and the weight loss method a low rate. Reported here are experiments designed to determine if grooves show depth changes without wear. Four tires were measured before mounting on a wheel, after mounting and inflation, and after inflation and storage. The mounted and inflated tires showed shallower shoulder grooves and deeper center grooves than the unmounted tires. In a second experiment, tires were measured immediately after a tread wear test and then stored mounted for two weeks before remeasuring. Each groove became deeper, and there was no change in the crown radius of any tire.

scholarly journals Synergistic and Antagonistic Effects of Sodium Molybdate-Zn2+System

2012 ◽  
Vol 9 (4) ◽  
pp. 1746-1752 ◽  
Author(s):  
J. Wilson Sahayaraj ◽  
A. John Amalraj ◽  
Susai Rajendran ◽  
N. Vijaya
Keyword(s):  
Aqueous Solution ◽  
Weight Loss ◽  
Inhibition Efficiency ◽  
Sodium Molybdate ◽  
Antagonistic Effect ◽  
Protective Film ◽  
Antagonistic Effects ◽  
Polarization Study ◽  
Weight Loss Method ◽  
Loss Method

The inhibition efficiency (IE) of sodium molybdate (SM) in controlling corrosion of carbon steel in an aqueous solution containing 120 ppm of Cl-, in the absence and presence of Zn2+has been evaluated by weight-loss method. A synergistic effect exists between SM and Zn2+when the concentration of Zn2+is 25 ppm and above. Inhibition efficiencies obtained are greater than 85%. Antagonistic effect exists between SM and Zn2+when the concentration of Zn2+is 10 ppm and below. The SM-Zn2+system shows excellent IE up to third day. Above third day IE decreases. Acceleration of corrosion takes place. Excellent IE is shown at pH 5,7 and 12. At pH 9, IE decreases since Zn2+is precipitated as Zn(OH)2in the bulk of the solution. Polarization study reveals that SM-Zn2+system functions as a mixed inhibitor. FTIR spectra reveal that the protective film consists of Fe2+-SM complex and Zn(OH)2.

Experimental Research on Erosion of P110 Tubing during Perforating

2014 ◽  
Vol 1073-1076 ◽  
pp. 2244-2247
Author(s):  
Hu Sun ◽  
Zhi Jun Ning ◽  
Zu Wen Wang ◽  
Zhen Li ◽  
Zhi Guo Wang
Keyword(s):  
Weight Loss ◽  
Erosion Rate ◽  
Large Scale ◽  
Guar Gum ◽  
Electrochemical Corrosion ◽  
Low Velocity ◽  
Gas Field ◽  
Weight Loss Method ◽  
Loss Method ◽  
Gas Fields

Erosion is a main failure of tubings and downhole tools in Changqing gas field. It is necessary to evaluate the erosion rate for the safety of tubing and strings. In this paper, the erosion of P110 steel, in the 0.2%wt guar gum fracturing fluid which contains sands, is investigated by weight loss method in the self-made jet experiment device. It is indicated that the erosion rate increases with the increment of slurry velocity exponentially. When the slurry velocity is in low velocity area, the electrochemical corrosion of dissolved oxygen dominates in erosion mechanism; when slurry velocity increases into middle velocity area, the weight loss is controlled by the synergism of corrosion-erosion; and when the slurry velocity increases into high velocity area, the weight loss rate is dominantly depended on erosion of particles. The results can provide guidelines for large-scale fracturing work of Changqing gas fields.

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