Efektivitas Ekstrak Kulit Buah Maja Sebagai Inhibitor pada Baja Karbon Aisi 1020 dalam Medium Korosif Nacl 3% dengan Variasi Waktu Perendaman

Research has been conducted on the effectiveness of maja fruit skin extract as an inhibitor of carbon steel AISI 1020 in a corrosive medium NaCl 3% with variations in immersion time. The samples carbon steel AISI 1020 were immersed in corrosive medium NaCl 3% without being given and given the inhibitor of maja skin extract with a concentration of 0.8% for 5, 15, 25, 35, and 45 days. Calculation of reduction in corrosion rate is carried out by the method of weight loss. The results showed that the addition of the maja fruit skin extract inhibitor was effective in reducing the corrosion rate of the sample with the greatest efficiency at 35 days immersion, which was equal to 72.35%. The results of XRD characterization show that the phase formed is pure Fe and Fe3O4 phase which is a corrosion product is immersed without inhibitor. The results of SEM characterization showed that the microstructure of the surface of the sample after immersion was there were cracks, holes, and lumps which indicated that the sample had been corroded. The results of EDS characterization show that in the soaked sample there were corrosion products in the form of FeO compounds whose magnitude increased every time immersion.

Download Full-text

Pemanfaatan Biomassa Sebagai Inhibitor Organik Pada Baja Aisi 1020 Di Universitas Lampung

Jurnal Teori dan Aplikasi Fisika ◽

10.23960/jtaf.v7i2.2055 ◽

2019 ◽

Vol 7 (2) ◽

pp. 197-206

Author(s):

Rizky Damayanti ◽

◽

Pulung Karo Karo ◽

Agus Riyanto ◽

◽

...

Keyword(s):

Weight Loss ◽

Carbon Steel ◽

Corrosion Rate ◽

Corrosive Medium ◽

Leaf Extract ◽

Corrosion Products ◽

Thin Layers ◽

Steel Aisi ◽

Organic Inhibitor

Research has been conducted on. The utilization of biomassa as an organic inhibitor in AISI 1020 steel at Lampung University. Samples of carbon steel AISI 1020 were immersed in 3% corrosive medium HCl without being given and given inhibitors of leaf extract jengkol, salam, ketapang and mango 0.8% for 4 and 7 days. inhibitors of leaf extract jengkol, salam, ketapang and mango 0.8% for 4 and 7 days. Calculation of reduction in corrosion rate is carried out by the method of weight loss. The results showed that the addition of Biomasaa inhibitors was effective in reducing the corrosion rate of the samples with the greatest efficiency in the soaking of 7 days of ketapang leaves, which was equal to 74.22%. The results of XRD characterization showed that the phases formed were Fe and Fe2O3 in samples coated with inhibitors and in samples soaked without phase inhibitors Fe2O3 which were corrosion products. The results of SEM characterization showed that the microstructure of the surface of the sample after immersion in the inhibitor contained thin layers overlaying the steel in the sample not coated with the inhibitor, clearly visible cracks and holes indicating that the sample had undergone corrosion.

Download Full-text

CORROSION BEHAVIOR OF CARBON STEEL WITH HMTA INHIBITOR IN PICKLING PROCESS

Surface Review and Letters ◽

10.1142/s0218625x07010834 ◽

2007 ◽

Vol 14 (06) ◽

pp. 1067-1071 ◽

Cited By ~ 3

Author(s):

D. LIU ◽

L. P. HUANG

Keyword(s):

Surface Roughness ◽

Weight Loss ◽

Carbon Steel ◽

Corrosion Rate ◽

Immersion Time ◽

Inhibition Efficiency ◽

Adsorption Process ◽

Free Energies ◽

Pickling Process ◽

Hydrogen Evolution Reactions

In this investigation, attempts have been made to study the inhibitive effect of hexamethylenetetramine (HMTA) on carbon steel in 10% HCl (mass%) by weight loss, potentiodynamic polarization, EIS, and AFM. Results indicate that inhibition efficiency (IE) of HMTA increases with the increase in pickling immersion time from 10 to 60 min, and IE also increases with the increase in temperature. At higher temperatures (80°C), the IE values are higher and almost independent of pickling time. HMTA can be adsorbed on the surface of metal and reduce the corrosion rate of metal. HMTA is a kind of mixed inhibitor and can retard both the anodic dissolution and cathodic hydrogen evolution reactions independently. IE increases with the concentration of HMTA. Electrochemistry measurement shows that adsorption follows the Langmuir isotherm and the value of free energies of adsorption (ΔG ads ) is < 0, so the adsorption process can occur automatically. AFM analyses show HMTA can affect the surface roughness and protect metal.

Download Full-text

Influence of temperature on corrosion rate and porosity of corrosion products of carbon steel in anoxic bentonite environment

Journal of Nuclear Materials ◽

10.1016/j.jnucmat.2013.06.031 ◽

2013 ◽

Vol 443 (1-3) ◽

pp. 20-25 ◽

Cited By ~ 12

Author(s):

J. Stoulil ◽

J. Kaňok ◽

M. Kouřil ◽

H. Parschová ◽

P. Novák

Keyword(s):

Carbon Steel ◽

Corrosion Rate ◽

Corrosion Products ◽

Influence Of Temperature ◽

Influence Of Temperature On

Download Full-text

Diffusion of Corrosion Products of Iron in Compacted Bentonite.

MRS Proceedings ◽

10.1557/proc-294-467 ◽

1992 ◽

Vol 294 ◽

Cited By ~ 2

Author(s):

K. Idemitsu ◽

H. Furuya ◽

Y. Inagaki

Keyword(s):

Carbon Steel ◽

Corrosion Product ◽

Hydrogen Generation ◽

Ferric Hydroxide ◽

Corrosion Products ◽

Ferrous Ion ◽

Silica Sand ◽

High Level Waste ◽

Buffer Material ◽

The Difference

ABSTRACTCarbon steel is one of the candidate overpack materials for high-level waste disposal. The corrosion rate of carbon steel is reduced by the presence of buffer materials such as bentonite and seems to be affected by the diffusion of corrosive materials and corrosion products through the buffer material.The apparent diffusivities of corrosion product of iron were measured in some bentonite specimens in contact with carbon steel. The apparent diffusivities of iron were also measured without carbon steel for comparison. The apparent diffusivities of corrosion product were on the order of 10−12 m2/s and showed a tendency to decrease with increasing density of the bentonite specimen. There was no significant effect of silica sand on the apparent diffusivities. The apparent diffusivities of iron in the system without carbon steel were in the range of 10−14 m2/s and showed a tendency to increase with increasing silica sand content. The difference of the diffusivities between corrosion product and iron without carbon steel seems to be due to the difference of diffusing species. The color of the corrosion product was dark-green during contact with bentonite specimens and became red on exposure to air in a few minutes. Gas bubbles were also observed in the corrosion product. This suggests hydrogen generation during corrosion of the carbon steel. Thus the diffusing species seems to be in a reduced state, probably ferrous ion. On the other hand, the diffusing species of iron without carbon steel was probably a ferric hydroxide complex that was negatively charged. This suggests that ferrous ion could diffuse in the surface water adsorbed on bentonite, while ferric complex was excluded.

Download Full-text

Microbial Corrosion of API 5L X-70 Carbon Steel by ATCC 7757 and Consortium of Sulfate-Reducing Bacteria

Journal of Chemistry ◽

10.1155/2014/130345 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7 ◽

Cited By ~ 11

Author(s):

Arman Abdullah ◽

Nordin Yahaya ◽

Norhazilan Md Noor ◽

Rosilawati Mohd Rasol

Keyword(s):

Weight Loss ◽

Carbon Steel ◽

Corrosion Rate ◽

Sulfate Reducing Bacteria ◽

Desulfovibrio Vulgaris ◽

Corrosion Morphology ◽

Sulfate Reducing ◽

Weight Loss Method ◽

Loss Method ◽

Reducing Bacteria

Various cases of accidents involving microbiology influenced corrosion (MIC) were reported by the oil and gas industry. Sulfate reducing bacteria (SRB) have always been linked to MIC mechanisms as one of the major causes of localized corrosion problems. In this study, SRB colonies were isolated from the soil in suspected areas near the natural gas transmission pipeline in Malaysia. The effects of ATCC 7757 and consortium of isolated SRB upon corrosion on API 5L X-70 carbon steel coupon were investigated using a weight loss method, an open circuit potential method (OCP), and a potentiodynamic polarization curves method in anaerobic conditions. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were then used to determine the corrosion morphology in verifying the SRB activity and corrosion products formation. Results from the study show that the corrosion rate (CR) of weight loss method for the isolated SRB is recorded as 0.2017 mm/yr compared to 0.2530 mm/yr for ATCC 7757. The Tafel plot recorded the corrosion rate of 0.3290 mm/yr for Sg. Ular SRB and 0.2500 mm/yr forDesulfovibrio vulgaris. The results showed that the consortia of isolated SRB were of comparable effects and features with the single ATCC 7757 strain.

Download Full-text

PENGARUH BASIC SEDIMENT AND WATER TERHADAP LAJU KOROSI PIPA X52 DAN A53 PADA MEDIA OIL SLUDGE.

ROTOR ◽

10.19184/rotor.v10i1.5141 ◽

2017 ◽

Vol 10 (1) ◽

pp. 13

Author(s):

Naufan Arviansyah ◽

Sumarji Sumarji ◽

Digdo Listyadi Setyawan

Keyword(s):

Weight Loss ◽

Carbon Steel ◽

Corrosion Rate ◽

Low Carbon Steel ◽

Measuring Method ◽

Oil Sludge ◽

Uniform Corrosion ◽

Low Carbon ◽

Weight Loss Method ◽

Loss Method

This research have a purpuse to know corrosion rate in pipe X52 and A53 at oil sludge media caused BS and W. Corrosion is a damage of metal that occurs because reaction between metal with environtment and produce unwanted of corrosion product. Pipe X52 and A53 is a type of low carbon steel that use for fluid transportation system in industry. Oil sludge is a sediment of crude oil from main gathering storage and containing variouses elements. Oil sludge have a one of element is Basic Sediment and Water that is can make corrosion happen to distribution pipes. Measuring Method used in this research is weight loss method. The result of corrosion rate in Oil Sludge media containing 30,17% BS and W for pipe A53 is 1,64 x 10-2 mmpy and the result for pipa X52 is 2,47 x 10-2 mmpy. The result of corrosion rate in Oil Sludge media containing 60,67% BS and W for pipe A53 is 2,12 x 10-2 mmpy and for pipe X52 the result is 3,13 x 10-2 mmpy. The result of this research showed pipe A53 have more resistance than pipe X52. The corrosion is classified as uniform corrosion. Keywords : A53, Weight Loss, Oil Sludge, X52.

Download Full-text

LPR Corrosion Rate, Weight Loss Measurements and SEM Studies of the Effect of the Some Novel Surfactants as Corrosion Inhibitors for Carbon Steel in CO2-Saturated 1% NaCl Solutions

Journal of Surfaces and Interfaces of Materials ◽

10.1166/jsim.2013.1012 ◽

2013 ◽

Vol 1 (1) ◽

pp. 4-14

Author(s):

Hany M. Abd El-Lateef ◽

V. M. Abbasov ◽

L. I. Aliyeva ◽

E. E. Qasimov ◽

I. T. Ismayilov

Keyword(s):

Weight Loss ◽

Carbon Steel ◽

Corrosion Rate ◽

Corrosion Inhibitors ◽

Sem Studies

Download Full-text

Effect of Biodiesel Concentration on Corrosion of Carbon Steel by Serratia marcescens

MATEC Web of Conferences ◽

10.1051/matecconf/201815601008 ◽

2018 ◽

Vol 156 ◽

pp. 01008 ◽

Cited By ~ 2

Author(s):

Yustina M Pusparizkita ◽

Tjandra Setiadi ◽

Ardiyan Harimawan

Keyword(s):

Carbon Steel ◽

Corrosion Rate ◽

Serratia Marcescens ◽

Corrosion Product ◽

Diesel Oil ◽

Corrosion Process ◽

Alternative Source ◽

Petroleum Reserves ◽

Growth Of Bacteria

Biodiesel come into being used as an alternative source of energy as the diminishing of petroleum reserves. This fuel is typically stored in tanks that are commonly made from carbon steel, which is easily corroded by microorganisms. Recent studies have shown that bacteria aside from SRB may also be involved in corrosion. Therefore, this research was aimed to evaluate the effect of biodiesel concentration (15%, 20% and 30% v/v) mixed in diesel oil on the corrosion of carbon steel by S. marcescens that dominate biocorrosion on hydrocarbon products. In this study, the corrosion process was investigated by evaluation of biofilm morphology and composition, the rate of corrosion and the corrosion product of carbon steel which was exposed in the mixture of hydrocarbons and the presence of S. marcescens. It can be concluded that higher concentration of biodiesel in diesel oil leads to higher growth of bacteria in the biofilm and higher corrosion rate.

Download Full-text

Localized Electrochemical Corrosion Characteristics of Carbon Steel in Seawater

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.842.104 ◽

2013 ◽

Vol 842 ◽

pp. 104-109

Author(s):

Yan Zou ◽

Qiang Bai ◽

Jia Wang ◽

Wei Wang ◽

Xiang Feng Kong

Keyword(s):

Carbon Steel ◽

Water Surface ◽

Immersion Time ◽

Electrochemical Corrosion ◽

Corrosion Products ◽

Local Corrosion ◽

Immersion Period ◽

Wire Beam Electrode

The galvanic and potential distributions of carbon steel immersed in seawater were studied by wire beam electrode (WBE) technique. Results indicated that the corrosion of carbon steel in seawater tended to local corrosion. With immersion time increasing, local corrosion was more and more serious. During the initial immersion period, the top of the coupon near the water surface was main cathode. With the corrosion extended, corrosion products gradually gathered on the surface of the carbon steel. Potential differences between cathode and anode gradually became small. Cathode and anode redistributed on the surface of carbon steel. At last, the top and the bottom were cathode while the middle was anode. The areas of anode first increased and then decreased. The areas of cathode were in contrast.

Download Full-text