Corrosion Behavior of Carbon Steel Under Environment Simulated inside of Concrete Containing Chloride Ion

Purpose This paper aims to study the effect of chloride ions concentration on the corrosion behavior of carbon steel in methyldiethanolamine (MDEA) aqueous solution in the sight of different process parameters of purification plant. Design/methodology/approach Due to the decrease of filtration efficiency and separation efficiency, the chloride ion in the desulfurization solution is enriched. The corrosion behavior of carbon steel under chloride ion enrichment environment was studied by weight-loss method, electrochemical impedance spectroscopy, cyclic polarization curve, X-ray photoelectron spectroscopy and scanning electron microscopy. Findings The results show that temperature and hydrogen sulfide loads are the main factors of corrosion in CO2-MDEA-H2O-H2S environment. The enrichment of chloride ions reduces the corrosion rate at low temperature but promotes the corrosion rate at high temperature. The chloride concentration should be controlled below 3000 mg/L, and no pitting corrosion was found under the experimental conditions. Originality/value The effect of chloride ion enrichment on MDEA solution corrosion shows that at low temperature, the increase of chloride ion will reduce the acid gas load and increase the density of corrosion products, so as to reduce the corrosion; on the contrary, at high temperature, the density of corrosion products will decrease and the corrosion will be intensified as well. It is believed that the chloride ion should be controlled below 3000 mg/L according to the results of the tests.

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Erosive Ions in Industrial Boiler Water on the Corrosion Behavior of Water-Wall Tubes

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.328.877 ◽

2013 ◽

Vol 328 ◽

pp. 877-881

Author(s):

Mao Dong Li ◽

Bin Zeng ◽

Yu Hui Du ◽

Juan Liu ◽

Jun Ming Zhao ◽

...

Keyword(s):

Carbon Steel ◽

Corrosion Inhibition ◽

Corrosion Behavior ◽

Concentration Ratio ◽

Electrochemical Corrosion ◽

Chloride Ion ◽

Boiler Water ◽

Water Wall ◽

Electrochemical Corrosion Behavior ◽

Industrial Boiler

The maximum allowable content of chloride ion in industrial boiler water is closely related to the concentration ratio and operating conditions, the reasons for industrial boiler can not be operated under too high concentration ratio is due to the limit of Cl- content. There are many studies for the electrochemical corrosion behavior of carbon steel caused only by chloride ion, but few studies for calcium and bicarbonate ions on the electrochemical corrosion behavior of carbon steel. In order to study the corrosion of water-wall tubes for industrial boilers (20# carbon steel) caused by chloride ion, the erosive anion (Cl) and Ca2+, electrochemical impedance spectroscopy and Tafel polarization techniques were performed. Autoclave static experiments were performed to study the corrosion inhibition property of carbon steel with 1-hydroxyethylidene-1, 1-diphosphonic acid (HEDP) additive in industrial boiler water medium. The results showed that Cl- could promote the corrosion of carbon steel obviously, HEDP has a good corrosion inhibition effect on 20# carbon steel at a concentration of 25 mg/L; Lower concentration Ca2+ in industrial boiler water could promote the corrosion while addition of higher concentration Ca2+ could inhibit the corrosion. It can provide a reference for the safe operation of the industrial boiler.

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Effect of chloride ion on corrosion behavior of low carbon steel in 0.1 M NaHCO3 solution with different dissolved oxygen concentrations

Journal of Material Science and Technology ◽

10.1016/j.jmst.2018.10.001 ◽

2019 ◽

Vol 35 (4) ◽

pp. 596-603 ◽

Cited By ~ 8

Author(s):

Fang Xue ◽

Xin Wei ◽

Junhua Dong ◽

Changgang Wang ◽

Wei Ke

Keyword(s):

Carbon Steel ◽

Dissolved Oxygen ◽

Corrosion Behavior ◽

Low Carbon Steel ◽

Chloride Ion ◽

Low Carbon ◽

Oxygen Concentrations

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Atmospheric Corrosion Behavior of Carbon Steel and Galvanized Steel after Exposure in Eretan and Ciwaringin, West Java Province, Indonesia

Indonesian Journal of Chemistry ◽

10.22146/ijc.46755 ◽

2020 ◽

Vol 20 (5) ◽

pp. 1032

Author(s):

Gadang Priyotomo ◽

Lutviasari Nuraini ◽

Siska Prifiharni ◽

Ahmad Royani ◽

Sundjono Sundjono ◽

...

Keyword(s):

Carbon Steel ◽

Corrosion Rate ◽

Corrosion Behavior ◽

Chloride Ion ◽

Galvanized Steel ◽

Uniform Corrosion ◽

Corrosion Attack ◽

West Java ◽

Corrosion Rates ◽

Weight Loss Method

The investigation of corrosion for carbon steel and galvanized steel has been conducted in the marine atmosphere of Eretan and Ciwaringin Districts, West Java Province. The exposure time of the field test was up to 200 days, and their corrosion rates are determined according to weight loss method. The objective of the work is to elucidate the corrosion behavior of those alloys which is affected by distances from coastline and environmental condition. The magnitude of corrosion rate for carbon steel was 20 times as high as that for galvanized steel in both districts The distance from coastline has significantly affected for the magnitude of corrosion rate, where that both alloys in Ciwaringin is lower than that in Eretan. The deposition of chloride ion in Eretan and Ciwaringin Districts were 4.305 mg/m2 day and 1.863 mg/m2 day, respectively, where the higher chloride ion can tend to increase the corrosion rates. Relative humidity (RH) which is over 60% has essential role for corrosion process as well as rainfall. The uniform corrosion attack was observed both alloys after exposure. The corrosion product phases of galvanized steel exhibits as zincite, hydrozincite and simonkolleite in Eretan as the typical coastline atmosphere phases but not in Ciwaringin. The formation of rust product for both metals lead the decrease of further corrosion attack due to the barrier between metal and environment. The usage of galvanized steel is remarkable to minimize corrosion attack compared to that of carbon steel in tropical coastline.

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