An Instrumented Field Corrosion Test Loop

1998 ◽  
Author(s):  
Alebachew Demoz ◽  
Kirk H. Michaelian ◽  
John Donini ◽  
Sankara Papavinasam ◽  
R. Winston Revie
Keyword(s):  
Weight Loss ◽  
Corrosion Rate ◽  
Corrosion Test ◽  
Visual Inspection ◽  
Electrochemical Methods ◽  
Corrosion Rates ◽  
Test Loop ◽  
The Media ◽  
Electrochemical Monitoring ◽  
Multi Phase

A multi-purpose instrumented loop in line with an oil producing well is described. The loop has several ports for coupons which were replaced periodically. Some of the coupons were used for electrochemical monitoring in addition to weight loss and visual inspection. Weight loss, pit rate and all the electrochemical methods used gave corrosion rates that were dependent on the positions of the coupons inside the loop. The corrosion rate of the coupons increased from top to bottom. This order reflected the media and flow to which the coupons were exposed in a multi-phase producing well.

Inhibition of Aloe in Corrosion Experimental Research

2011 ◽  
Vol 233-235 ◽  
pp. 648-651
Author(s):  
Ai Jun Wei ◽  
Bei Feng ◽  
Xin Zhang ◽  
Fu Yong Huo
Keyword(s):  
Weight Loss ◽  
Corrosion Rate ◽  
Work Environment ◽  
Corrosion Inhibition ◽  
Corrosion Test ◽  
Inhibition Effect ◽  
Corrosion Medium ◽  
Different Temperatures ◽  
Weight Loss Method ◽  
Loss Method

In this corrosion test, simulated brine is used as corrosion medium, added different concentrations of aloe juice. Static weight-loss method is employed, meanwhile, we calculated corrosion rate of Q235 steel and researched on the corrosion inhibition effect of aloe in different temperatures. Results show that aloe is a good inhibitor, rate of corrosion inhibition can reach 80% or more and suitable for the temperature of work environment is less than 60 °C.

The Validity of Electrochemical Methods for Measuring Corrosion Rates of Copper-Nickel Alloys in Sea Water

CORROSION ◽  
1979 ◽  
Vol 35 (11) ◽  
pp. 505-509 ◽  
Author(s):  
BARRY C. SYRETT ◽  
DIGBY D. MACDONALD
Keyword(s):  
Weight Loss ◽  
Linear Polarization ◽  
Polarization Resistance ◽  
Nickel Alloys ◽  
Sea Water ◽  
Ac Impedance ◽  
Electrochemical Methods ◽  
Potential Step ◽  
Corrosion Rates ◽  
Copper Nickel

Abstract This work was stimulated by reports that electrochemical methods for measuring the polarization resistance of copper, nickel, or copper-nickel alloys in aqueous systems may lead to appreciable errors in the estimates of the corrosion rate. In the present work, the polarization resistance (Rp) of two copper-nickel alloys (90:10 Cu:Ni and 70:30 Cu:Ni) was monitored as a function of time in flowing sea water that contained 0.045, 0.85, 6.6, or 26.3 mg/dm3 dissolved oxygen. Rp values were obtained using the linear polarization, potential step, and AC impedance techniques. The total weight loss during the test period was calculated from the area under the 1/Rp versus time curve and compared with the measured weight loss. The experimental data support the validity of electrochemical methods for measuring corrosion rates of copper-nickel alloys in sea water, provided that a sufficient number of Rp measurements are made during the first 24 hours, and provided that proper consideration is given to the capacitive elements of the metal/solution interfacial impedance. Previous reports that electrochemical measurements may lead to underestimates of the corrosion rates are thought to have resulted primarily from undetected (and very high) corrosion rates at short exposure times. Reported overestimates of the corrosion rates are thought to have resulted from the use of a potential sweep rate that was too high (linear polarization technique), a time for current decay that was too short (potential step technique), or excitation frequencies that were insufficiently low (AC impedance technique).

scholarly journals Evaluation of the Corrosion Rate of Aluminum 6063 in Petrol, Kerosene and Water

2018 ◽  
Vol 2 (1) ◽  
pp. 19-27
Author(s):  
N. O. Adekunle ◽  
P. O. Aiyedun ◽  
S. I. Kuye ◽  
R. O. Adetunji
Keyword(s):  
Weight Loss ◽  
Corrosion Rate ◽  
Optical Microscope ◽  
Distilled Water ◽  
Metallic Materials ◽  
Three Samples ◽  
Weight Loss Method ◽  
The Media ◽  
Average Corrosion Rate ◽  
Loss Method

The unparalleled combinations of properties of aluminum and its alloy makes aluminum one of the most versatile, economical, and attractive metallic materials for a broad range of uses. This study was carried out to evaluate the influence of kerosene, petrol and water on the corrosion performance of three samples of aluminum 6063 alloy (A and B sourced locally while sample C is an imported material). The corrosion rate was determined both by weight loss and Potentiostatics method, and the microstructure of the samples after five weeks of immersion also was examined with the aid of an optical microscope. Samples A, B and C were immersed in the media for five (5) weeks duration. The cumulative corrosion rate was measured at the end of each week. The average corrosion rates using the weight loss method for A in petrol, kerosene and distilled water were 3.100E-4, 4.905 E-4 and 6.205 E-4; for B were 4.367 E-4, 2.703 E-4 and 2.147 E-4; and those of C were 4.550 E-4, 2.257 E-4 and 1.633 E-4 respectively. Similarly, the average corrosion rate using Potentiostatics method of A in petrol, kerosene and distilled water were 0.586E-3, 0.643E-3 and 0.454E-3; for B were 0.206E-3, 0.197E-3 and 0.298E-3; and those of C were 0.183E-3, 0.232E-3 and 0.407E-3 respectively. The average result showed that Sample A had the highest corrosion rate. The media which corroded the samples the most was petrol.

The Effect of FeSO4 Containing Solution on Microbiological Influenced Corrosion by Desulfovibrio Baculatus Bacteria on API 5L X65 Steel

2013 ◽  
Vol 858 ◽  
pp. 177-183
Author(s):  
Bambang Widyanto ◽  
Altur Tambun
Keyword(s):  
Weight Loss ◽  
Corrosion Rate ◽  
Corrosion Test ◽  
Iron Sulfide ◽  
Oil And Gas Industry ◽  
Bacteria Growth ◽  
Immersion Period ◽  
Wide Range ◽  
X65 Steel ◽  
Api 5L X65 Steel

Microbiological Influenced Corrosion (MIC) is a common cause of metallic failure and currently known as one of the important case in pipeline failure. Otherwise it was often found also in cooling water system, in the equipment of pulp and paper, and oil and gas industry. Certain bacteria have a wide range of life condition and can be found anywhere. Sulfate Reducing Bacteria (SRB) is a bacteria that was frequently found as a cause of corrosion in steel surface by creating pits. In this research, the corrosion test was done by using one species of SRB which is Desulfovibrio Baculatus. The water that contains bacteria growth medium (API Sulfate Broth) is used as a media for API 5L X65 steel corrosion test. Sulfate for the growing of SRB was added in the solution in 8.56 , 17.12 , 42.8 and 85.64 ppm concentration, and the immersion test was done during 1,7,14,21 days. The source of sulfate is FeSO4.7H2O, and this compound was considered also as a source of Iron (II). The result shows that the weight loss is increase with increasing of immersion period. Between 7-14 days of immersion time, the increase of weight loss that present a corrosion rate attains the highest condition and decrease again after a longer time of immersion period. Morphologic observation reveals that the corrosion product consists of Iron Oxide and biological deposits that were formed at the beginning of corrosion test, and continuing with the formation of Iron Sulfide at a longer period of immersion. The formation of Iron Sulfide was associated with the increase of corrosion rate. Keywords: MIC, SRB, Desulfovibrio Baculatus, Immersion, FeSO4 content.

Corrosion of 434 Stainless Fibres in Hydrochloric Acid

2013 ◽  
Vol 318 ◽  
pp. 312-315
Author(s):  
Xiong Yang ◽  
Jian Tong ◽  
Xiao Ming Li
Keyword(s):  
Weight Loss ◽  
Stainless Steel ◽  
Hydrochloric Acid ◽  
Corrosion Rate ◽  
Etching Time ◽  
Direct Part ◽  
Steel Fibres ◽  
Corrosion Rates ◽  
Weight Loss Method ◽  
Loss Method

The effects of concentration and temperature of hydrochloric acid and etching time on the corrosion rates of 434 stainless steel fibres are investigated by using weight loss method,The results show that with the concentration of hydrochloric acid increase,the temperature of hydrochloric acid rise, etching time prolonging, the corrosion rate of 434 stainless steel fibres is increased, and the corrosion rate of smalldimension of 434 stainless steel fibres faster.Though Cl- of hydrochloric acid doesn’t take direct part in the reaction,the corrosion rate is significantly accelerated.

scholarly journals Investigating the Inhibitive Characteristics of Moringa Oleifera on the Corrosion of Mild Steel

2021 ◽  
Vol 9 (9) ◽  
pp. 595-602
Author(s):  
Okpaga D. M
Keyword(s):  
Weight Loss ◽  
Corrosion Rate ◽  
Mild Steel ◽  
Immersion Time ◽  
Moringa Oleifera ◽  
Inhibition Efficiency ◽  
Sodium Hydroxide Solution ◽  
Total Surface Area ◽  
Corrosion Rates ◽  
Very High

Abstract: This work deals with the inhibitive characteristics of Moringa oleifera fruits and leaves extracts in Hydrochloric Acid solution and Sodium Hydroxide solution respectively on the corrosion of mild steel. This was carried out using weight loss and polarization techniques. The effects of immersion time, the effect of acid and alkaline concentration on the corrosion behavior of mild steel in 1.0M HCl and 1.0 NaOH with addiction of extracts were deduced. The fruits which were dried and grounded to powder of 10g and the leaves which range from 25cm3 to 100cm3 were used for this study. The corrosion rate was very high in the absence of inhibitors (Moringa oleifera fruits and the leaves extracts). The mild steel was cut into coupon averaging a total surface area of 4.262cm2 . The sample was weighed and immersed into a beaker containing 1.0M NaOH with different volumes of moringa leaves and 1.0M HCl with 10g dried concentrated powdered moringa fruits with coupons removed every 7 days for weight loss measurements till 4 weeks. The corrosion rates were found to be decreased by 83% in 1.0M HCl and 78% in 1.0M NaOH respectively, values of inhibition efficiency (ࣁ (%were calculated from weight loss. The results obtained showed that the Moringa oleifera fruits and leaves extracts could serve as effective inhibitors on the corrosion of mild steel in HCl and NaOH respectively. Keywords: Moringa oleifera, Corrosion rate, Weight loss, Mild steel, Inhibitor.

An Innovative Specimen for Mg Corrosion Studies

2011 ◽  
Vol 690 ◽  
pp. 365-368 ◽  
Author(s):  
Zhi Ming Shi ◽  
Andrej Atrens
Keyword(s):  
Weight Loss ◽  
Corrosion Rate ◽  
High Purity ◽  
Crevice Corrosion ◽  
Corrosion Current Density ◽  
Cathodic Polarization ◽  
Corrosion Current ◽  
Polarization Curves ◽  
Corrosion Rates ◽  
Corrosion Studies

Plug-in specimens enable measurement of reliable Mg polarization curves. Cathodic polarization curves were measured for high purity Mg in 3.5% NaCl saturated with Mg(OH)2using (i) mounted specimens and (ii) plug-in specimens. Polarization curves yielded the corrosion current densityicorrand the corresponding corrosion ratePi, which was compared with corrosion rates evaluated from hydrogen evolution,PH, and weight loss,PW. Mounted specimens producePivalues three times larger than plug-in specimens, due to crevice corrosion in the mounted specimens. Plug-in specimens had no crevice and allow simultaneous measurement ofPHandPi. Piwas less thanPHand indicated an apparent valence of 1.45 in support of the existence of the uni-positive Mg+ion.

Under-Deposit Corrosion Rate Evaluation in Cooling Water System by Weight Loss, Profilometric and Electrical Resistance Methods

2014 ◽  
Vol 548-549 ◽  
pp. 242-246 ◽  
Author(s):  
K. Rithdang ◽  
P. Wongbunyakul ◽  
P. Jamawatr ◽  
P. Lortrakul ◽  
G. Lothongkum
Keyword(s):  
Weight Loss ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Electrical Resistance ◽  
Water System ◽  
Cooling Water ◽  
Corrosion Rates ◽  
Cooling Water System ◽  
Rate Evaluation

Under-deposit corrosion in cooling water system is often found in industries. The under-deposit corrosion rate in cooling water system is rarely found in a literature. The mechanism depends on the metal, types of deposit and corrosive species in the cooling water system. In this study, the under-deposit corrosion rates of carbon steel in cooling water at various times were determined by weight loss, profilometric and electrical resistance methods at 40C. From this experiment, these three methods showed the consistent results. The under-deposit corrosion rates of carbon steel were about 0.1-0.2 mm/y.

scholarly journals Effects of Alloying Elements on the Corrosion Behavior of Sputter–deposited Zr–(12–21)Cr–W Alloys in 0.5 M NaCl Solution

1970 ◽  
Vol 25 ◽  
pp. 75-82
Author(s):  
Basu Ram Aryal ◽  
Jagadeesh Bhattarai
Keyword(s):  
Corrosion Test ◽  
Open Circuit Potential ◽  
Chemical Society ◽  
Open Circuit ◽  
Sputter Deposition ◽  
Nacl Solution ◽  
Corrosion Rates ◽  
Sputter Deposited ◽  
Stable Passivity ◽  
Zirconium Metal

The synergistic effect of the simultaneous additions of tungsten and zirconium in thesputter-deposited amorphous or nanocrystalline Zr-(12-21)Cr-W alloys is studied in 0.5 MNaCl solution open to air at 25°C using corrosion tests and open circuit potentialmeasurements. Corrosion rates of the sputter-deposited Zr-(12-21)Cr-W alloys containing10-80 at % tungsten (that is, 0.95-1.85 x 10-2 mm.y-1) are more than one order of magnitudelower than that of the sputter-deposited tungsten and even lower than those of zirconium aswell as chromium in 0.5 M NaCl solution. The addition of 8-73 at % zirconium content inthe sputter-deposited binary W-(12-21)Cr alloys seems to be more effective to improve thecorrosion-resistant properties of the sputter-deposited ternary Zr-Cr-W alloys containing12-21 at % chromium in 0.5 M NaCl solution. The sputter-deposited Zr-(17-21)Cr-W alloyscontaining an adequate amounts of zirconium metal showed the more stable passivity andshowed higher corrosion resistance than those of alloy-constituting elements in 0.5 M NaClsolution open to air at 25°C.Keywords: Zr-(12-21)Cr-W alloys, sputter deposition, corrosion test, open circuit potential,0.5 M NaCl.DOI:  10.3126/jncs.v25i0.3305Journal of Nepal Chemical Society Volume 25, 2010 pp 75-82

Determination of the corrosion rate of powder materials by electrochemical methods

2011 ◽  
Vol 47 (7) ◽  
pp. 921-925 ◽  
Author(s):  
V. I. Kichigin ◽  
O. M. Perel’man ◽  
A. I. Rabinovich ◽  
N. V. Bezmaternykh ◽  
O. P. Koshcheev
Keyword(s):  
Corrosion Rate ◽  
Electrochemical Methods ◽  
Powder Materials
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