Modeling the Effect of Piperazine on Carbon Steel Corrosion Rate in Carbonated Activated MDEA Solutions

Abstract Models for predicting top-of-line corrosion (TLC) rates on carbon steels are important tools for cost-effectively designing and operating natural gas transportation pipelines. The work presented in this paper is aimed to investigate how the corrosion rates on carbon steel is affected by acids typically present in the transported pipeline fluids. This investigation may contribute to the development of improved models. In a series of experiments, the corrosion rate differences for pure CO2 (carbonic acid) corrosion and pure organic acid corrosion (acetic acid and formic acid) on X65 carbon steel were investigated at starting pH values; 4.5, 5.3, or 6.3. The experiments were conducted in deaerated low-salinity aqueous solutions at atmospheric pressure and temperature of 65 °C. The corrosion rates were evaluated from linear polarization resistance data as well as mass loss and released iron concentration. A correlation between lower pH values and increased corrosion rates was found for the organic acid experiments. However, the pH was not the most critical factor for the rates of carbon steel corrosion in these experiments. The experimental results showed that the type of acid species involved and the concentration of the undissociated acid in the solution influenced the corrosion rates considerably.

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Corrosion Characteristics of Carbon Steel upon Exposure to Biodiesel Synthesized from Used Frying Oil

REAKTOR ◽

10.14710/reaktor.17.4.177-184 ◽

2017 ◽

Vol 17 (4) ◽

pp. 177

Author(s):

Adhi Setiawan ◽

Nora Amelia Novitrie ◽

Agung Nugroho ◽

W Widiyastuti

Keyword(s):

Carbon Steel ◽

Corrosion Rate ◽

Contact Time ◽

Steel Surface ◽

Steel Corrosion ◽

Frying Oil ◽

Effect Of Temperature ◽

Used Frying Oil ◽

Carbon Steel Surface ◽

Rate Maximum

The use of biodiesel leads to corrosion of automotive material, which can potentially shorten engine lifetime. The study aims to investigate the effect of temperature and contact time on the corrosion characteristics of carbon steel upon exposure to biodiesel synthesized from used frying oil. The corrosion rate of carbon steel was analyzed based on weight loss measurement according to the standard of ASTM G31 as affected by temperature and contact time. The immersion temperatures used in this study were 30oC, 40oC, and 70o, respectively. The contact times studied were 30 days, 40 days, and 50 days respectively. The results show that the increase of temperature and contact time of biodiesel on carbon steel surface speeds up the corrosion rate. Maximum corrosion rate (0.083 mmy) was observed on the carbon steel contacted to biodiesel at 70oC for 50 days. The SEM results showed an irregular shape of the corroded carbon steel surface. XRD / FTIR analysis of carbon steel samples show the presence of peaks, detected as Fe2O3, FeO(OH) and Fe2O2CO3, as the corrosion products. Keywords: biodiesel; carbon steel; corrosion; FAME; used frying oil

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Prediction of Carbon Steel Corrosion Rate Based on an Alternating Conditional Expectation (Ace) Algorithm

Chemistry and Technology of Fuels and Oils ◽

10.1007/s10553-016-0664-7 ◽

2016 ◽

Vol 51 (6) ◽

pp. 728-739 ◽

Cited By ~ 1

Author(s):

Xing-yi Chen ◽

Zong-ming Yuan ◽

Yun-ping Zheng ◽

Wei Liu

Keyword(s):

Carbon Steel ◽

Corrosion Rate ◽

Conditional Expectation ◽

Steel Corrosion ◽

Alternating Conditional Expectation ◽

Ace Algorithm

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ELECTROCHEMICAL, GRAVIMETRIC AND X-RAY CHARACTERIZATION OF LOW CARBON STEEL CORROSION RATE AND PRODUCTS AFTER ATMOSPHERIC EXPOSURE IN THE CARIBBEAN AREA

Corrosion Reviews ◽

10.1515/corrrev.2001.19.5-6.435 ◽

2001 ◽

Vol 19 (5-6) ◽

pp. 435-452 ◽

Cited By ~ 1

Author(s):

L. Maldonado, ◽

L. Veleva, ◽

P. Quintana, ◽

O.T. de Rincón, ◽

A. Rincón, ◽

...

Keyword(s):

Carbon Steel ◽

Corrosion Rate ◽

Low Carbon Steel ◽

Steel Corrosion ◽

Low Carbon ◽

X Ray ◽

Atmospheric Exposure ◽

Caribbean Area ◽

The Caribbean

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Corrosion behaviors of steels under supercritical CO2 conditions

Corrosion Reviews ◽

10.1515/corrrev-2014-0067 ◽

2015 ◽

Vol 33 (3-4) ◽

pp. 151-174 ◽

Cited By ~ 10

Author(s):

Liang Wei ◽

Yucheng Zhang ◽

Xiaolu Pang ◽

Kewei Gao

Keyword(s):

Carbon Steel ◽

Corrosion Rate ◽

Stainless Steels ◽

Steel Corrosion ◽

Carbon Steels ◽

Corrosion Mechanism ◽

Electrochemical Behaviors ◽

Structure Morphology ◽

Corrosion Behaviors ◽

Corrosion Scales

AbstractCarbon dioxide (CO2) corrosion at low partial pressure has been widely recognized, but research on supercritical CO2 (SC CO2) corrosion is very limited. By far, investigations on steel corrosion under SC CO2 conditions have mainly focused on the corrosion rate, structure, morphology, and composition of the corrosion scales as well as the electrochemical behaviors. It was found in aqueous SC CO2 environment, that the corrosion rate of carbon steel was very high, and even stainless steels (13Cr and high-alloy CrNi steels) were subjected to some corrosion. Inhibitor could reduce the corrosion rate of carbon steels and stainless steels, but none of the tested inhibitors could reduce the corrosion rate of carbon steel to an acceptable value. Impurities such as O2, SO2, and NO2 and their mixtures in SC CO2 increased the corrosion rate of carbon steel. However, the existing studies so far were very limited on the corrosion mechanism of steels in SC CO2 conditions. Thus, this paper first reviews the finding on the corrosion behaviors of steels under SC CO2 conditions, points out the shortcomings in the present investigations and finally looks forward to the research prospects on SC CO2 corrosion.

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Kinerja kalium metavanadat sebagai inhibitor korosi baja karbon rendah dalam lingkungan klorida dan sulfida

Jurnal Teknik Kimia Indonesia ◽

10.5614/jtki.2008.7.3.3 ◽

2018 ◽

Vol 7 (3) ◽

pp. 828

Author(s):

Isdiriayani Nurdin ◽

R Asri Pratiwi ◽

Aditya Farhan A ◽

Fikri Anggara P ◽

Rennie Sari

Keyword(s):

Carbon Steel ◽

Corrosion Rate ◽

Corrosion Inhibitor ◽

Low Carbon Steel ◽

Chloride Concentration ◽

Steel Corrosion ◽

Low Carbon ◽

Cyclic Voltammetry Method ◽

The Common ◽

Chloride Environment

Inhibitor addition is one of the common corrosion control methods. Potassium metavanadate (KVO3) is the common corrosion inhibitor for Benfield solution in CO2 absorber. Former research shows that KVO3 is also able to inhibit the corrosion in seawater containing Sulphate Reducing Bacteria (SRB) due to its capacity as biocide. Chloride and Sulfide are common corrosive ions found in process fluids in industries. Therefore, this research is carried out to study the performance of KVO3 as a corrosion inhibitor for low- carbon steel in chloride and sulfide contaminated environment. The objective of this research was achieved by measuring low-carbon steel corrosion rate in various concentrations of contaminants. The corrosion rate was measured by Tafel method. The corrosion inhibition mechanisms were studied using cyclic voltammetry method. Meanwhile the corrosion products were identified by X - ray diffraction spectrometry (XRD). This research results that KVO3 is an effective corrosion inhibitor in chloride environment when the chloride concentration ranges between 20 g/L and 30 g/L. In this range of concentration, KVO3 performs more than 99% efficiency. While in sulfide environment, KVO3 is an ineffective corrosion inhibitor. On the other hand, the addition of KVO3 reduces the corrosion rate of carbon steel in seawater containing sulfide, although its performance does not meet the effective inhibitor criteria. Higher concentration of sulfide results the higher inhibition efficiency of KVO3.Keywords: Potassium metavanadate, low - carbon steel, corrosion inhibitor AbstrakPenambahan inhibitor merupakan salah satu metode pengendalian korosi. Kalium metavanadat (KVO3) sering digunakan sebagai inhibitor korosi pada absorber CO2 yang menggunakan larutan Benfield. Hasil penelitian sebelumnya menunjukkan bahwa KVO3 mampu menginhibisi korosi baja karbon rendah dalam air laut yang mengandung bakteri pereduksi sulfat (SRB) dengan bertindak sebagai biosida. Klorida dan sulfida merupakan ion-ion korosif yang umum ditemui dalam fluida proses di industri. Penelitian ini dilakukan untuk mempelajari kinerja KVO3 sebagai inhibitor korosi baja karbon rendah dalam lingkungan akuatik yang terkontaminasi klorida, ataupun sulfida. Untuk mencapai tujuan tersebut dilakukan pengukuran laju korosi baja karbon rendah dengan jenis dan konsentrasi kontaminan bervariasi. Pengukuran laju korosi dilakukan dengan metode Tafel. Mekanisme inhibisi diprediksi dengan metode voltametri siklik. Sedangkan produk korosi diidentifikasi dengan menggunakan spektrometri difraksi sinar X (XRD). Dari penelitian ini, diperoleh hasil bahwa KVO3 efektif sebagai inhibitor korosi baja karbon rendah pada lingkungan klorida berkonsentrasi antara 20 g/L hingga 30 g/L dengan efisiensi di atas 99%. Pada lingkungan sulfida, KVO3 kurang efektif menginhibisi korosi baja karbon rendah. Sedangkan pada air laut sintetik yang mengandung sulfida, walaupun belum termasuk kategori inhibitor efektif, namun KVO3 dapat menurunkan laju korosi baja karbon dengan efisiensi inhibisi yang meningkat seiring dengan kenaikan konsentrasi sulfida.Kata kunci: kalium metavanadat, baja karbon rendah, inhibitor korosi

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Application of Frumkin Isotherm for Carbon Steel Corrosion in Soil Media

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.652-654.963 ◽

2013 ◽

Vol 652-654 ◽

pp. 963-966

Author(s):

Amy Wahida Mohamad Sa'adan ◽

Madzlan Aziz ◽

Rita Sundari

Keyword(s):

Carbon Steel ◽

Thermodynamic Properties ◽

Corrosion Rate ◽

Surface Coverage ◽

Steel Corrosion ◽

Heat Of Reaction ◽

Frumkin Isotherm ◽

Corrosion Study ◽

Soil Media ◽

Steel Coupon

This study investigated carbon steel corrosion in three types of soil media (laterite, yellow soil and kaolin). The Frumkin isotherm was used to study the mechanism of the corrosion process. A good linear correlation (y = 3.4x + 3.3) in terms of soil concentration vs. surface coverage was obtained with the value of R2 = 0.996 for carbon steel corrosion in laterite solution at 30oC. A standard weight loss method was used to determine the degree of surface coverage. Investigation on corrosion rate was also carried out on the basis of immersion time and temperature effects. The results showed that yellow soil solution yielded the highest corrosion rate on carbon steel coupon for 5 consecutive days and at various temperatures (30 – 90oC). The thermodynamic properties in terms of heat of reaction and entropy were also investigated in this corrosion study. The results showed that carbon steel coupon was least corroded in the environment of kaolin solution as indicated by its highest endothermic value and lowest entropy. The study showed that the findings are consistent in relation to thermodynamic properties. This work is beneficial for the corrosion study of carbon steel in soil media corresponding to lifetime of buried pipelines and cost safety.

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Research on Carbon Steel Test Conducted by Means of Steady-Damp Heat Periodic Immersion Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.511.78 ◽

2012 ◽

Vol 511 ◽

pp. 78-82

Author(s):

Dong Hao Li ◽

Jun Hu ◽

Ling Xia Li

Keyword(s):

Carbon Steel ◽

Corrosion Rate ◽

Linear Correlation ◽

Corrosion Test ◽

Steel Corrosion ◽

Accelerated Test ◽

Immersion Method ◽

Corrosion Of Steel ◽

Corrosion Time

After analyzing the hazards of steel corrosion, the accelerated steel corrosion test conducted by means of steady-damp heat periodic immersion method (artificial accelerated test) is briefly introduced, and the result of the test is analyzed. It is indicated by the test that, the steady-damp heat periodic immersion method could significantly accelerate the corrosion of steel, and there is a linear correlation shown between the corrosion rate and corrosion time of steel.

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Corrosion rate of carbon steel under synergistic effect of seawater parameters including pH, temperature, and salinity in turbulent condition

Corrosion Reviews ◽

10.1515/corrrev-2013-0032 ◽

2013 ◽

Vol 31 (3-6) ◽

pp. 135-144 ◽

Cited By ~ 3

Author(s):

Alisina Toloei ◽

Sanam Atashin ◽

Mahmood Pakshir

Keyword(s):

Carbon Steel ◽

Corrosion Rate ◽

Fluid Velocity ◽

Steel Corrosion ◽

Affecting Factors ◽

Effective Parameters ◽

Simultaneous Effect ◽

Experimental Media ◽

Aisi 1045 ◽

Combined Action

AbstractThe variation of AISI 1045 carbon steel corrosion rate in seawater is investigated under the simultaneous effect of marine parameters in both stagnant and turbulent conditions. The combined effect of salinity, velocity, pH, and temperature is studied using two-by-two graphical curves, while each parameter is applied at three levels. The possible influence of simultaneously acting factors on each considering parameter is experimentally studied and explained using theoretical basis. This paper offers an advantage of considering the simultaneous effect of parameters instead of individual ones, which simulate the experimental media close to the real in-site marine environment where all the affecting factors act in a combined manner. The most innovation of this study is two-by-two investigation of combined action of effective parameters on corrosion rate, which is much more comprehensive and detailed compared to previous researches. Every parameter is considered at three ranges and all the possible interactions with other factors are taken into account. It is proven that the effect of considered parameters on the rate of corrosion is the function of other simultaneously acting factors. The role of fluid velocity condition and also the reaction polarization status is found to be pronounced.

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