Dissolution behaviour of magnetite film formed over carbon steel in dilute organic acid media

Prince, A.A.M; Velmurugan, S.; Narasimhan, S.V.; Ramesh, C.; Murugesan, N.; Raghavan, Pandalgudi Seshan; Gopalan, R.

doi:10.1016/s0022-3115(01)00425-1

Cited by 34 publications

(23 citation statements)

References 7 publications

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“…The Ni 2p peak can be separated into three constituent peaks, representing the metallic state (Ni (M)), nickel oxide (NiO), and nickel hydroxide (Ni(OH) 2 ). The Cr 2p peak can be separated into three constituent peaks, representing the metallic state (Cr (M)), chromium(III) oxide (Cr 2 O 3 ), and chromium hydroxide (Cr(OH) 3 ). The Fe 2p spectra can be separated into four constituent peaks representing the metallic state (Fe (M)), iron(II, III) oxide (Fe 3 O 4 ), iron(II) oxide (FeO) and, iron(III) hydroxide (FeOOH).…”

Section: Corrosion Behavior Of Alloy 600 Coupled With the Magnetitementioning

confidence: 99%

Corrosion Behavior of Alloy 600 Coupled with Electrodeposited Magnetite in Simulated Secondary Water of PWRs

2015

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Section: Corrosion Behavior Of Alloy 600 Coupled With the Magnetitementioning

confidence: 99%

Corrosion Behavior of Alloy 600 Coupled with Electrodeposited Magnetite in Simulated Secondary Water of PWRs

2015

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“…These corrosion products reduce the efficiency of the SG by deterioration of the heat transfer and accelerate the corrosion of SG tubes [10][11][12]. Magnetite deposited on the Ni-based alloy tube in operating SGs has a porous structure [13,14].…”

Section: Open Accessmentioning

confidence: 99%

Galvanic Corrosion between Alloy 690 and Magnetite in Alkaline Aqueous Solutions

Jeon

Song

Hur

2015

Metals

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Abstract:The galvanic corrosion behavior of Alloy 690 coupled with magnetite has been investigated in an alkaline solution at 30 °C and 60 °C using a potentiodynamic polarization method and a zero resistance ammeter. The positive current values were recorded in the galvanic couple and the corrosion potential of Alloy 690 was relatively lower. These results indicate that Alloy 690 behaves as the anode of the pair. The galvanic coupling between Alloy 690 and magnetite increased the corrosion rate of Alloy 690. The temperature increase led to an increase in the extent of galvanic effect and a decrease in the stability of passive film. Galvanic effect between Alloy 690 and magnetite is proposed as an additional factor accelerating the corrosion rate of Alloy 690 steam generator tubing in secondary water.

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“…[3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The review identified the following cleaning agents as candidates.…”

Section: Approachmentioning

confidence: 99%

“…• hydrochloric acid 7,14,15 • nitriloacetic acid 8,9 • ascorbic acid 9,11 • EDTA 8,9,12,16,17 • pyridine dicarboxylic acid 9 • catechol 8,13 • tributyl phosphate (TBP) 14 • pyrophosphate 16 • sodium hydroxide and Pluronic L62 at 100 °C • mercaptocarboxylic acid 17 • cysteine 17,18 • phenolics 17,19 • thioglycolic acid 17,20 We eliminated hydrochloric acid from consideration because of its corrosivity. We eliminated triethanolamine because of concerns about adding ammonia compounds to the high level waste system.…”

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Investigation of Alternative Approaches for Cleaning Mott Porous Metal Filters

Poirier

2003

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SummaryThe Department of Energy selected Caustic Side Solvent Extraction (CSSX) as the preferred cesium removal technology for Savannah River Site (SRS) waste. As a pretreatment step for the CSSX flowsheet, the incoming salt solution that contains entrained sludge is contacted with monosodium titanate (MST) to adsorb strontium and select actinides. The resulting slurry is filtered to remove the sludge and MST. Filter fouling occurs during this process. At times, personnel can increase the filtrate rate by backpulsing or scouring. At other times, the filtrate rate drops significantly and only chemical cleaning will restore filter performance. The current baseline technology for filter cleaning uses 0.5 M oxalic acid. The Salt Processing Project (SPP) at SRS, through the Tanks Focus Area, requested an evaluation of other cleaning agents to determine their effectiveness at removing trapped sludge and MST solids compared with the baseline oxalic acid method.A review of the technical literature identified compounds that appear effective at dissolving solid compounds. Consultation with the SPP management team, engineering personnel, and researchers led to a selection of oxalic acid, nitric acid, citric acid, and ascorbic acid for testing. Tests used simulated waste and actual waste as follows. Personnel placed simulated or actual SRS High Level Waste sludge and MST in a beaker. They added the selected cleaning agents, stirred the beakers, and collected supernate samples periodically analyzing for dissolved metals.The conclusions from this work follow.• 0.5 M oxalic acid and 4.0 M nitric acid proved most effective at dissolving iron, aluminum, and titanium. The 0.5 M oxalic acid solution dissolved 23 -44 % of the iron, 11 -41 % of the aluminum, and 98 -100 % of the titanium calculated to be present in the solids used in the tests. The 4 M nitric acid solution dissolved 15 -32 % of the iron, 13 -47 % of the aluminum, and 67 -100% of the titanium calculated to be present in the solids used in the tests. The citric acid solution dissolved 1 % of the iron, 7 % of the aluminum, and 17 % of the titanium. The ascorbic acid solution dissolved 8 % of the iron, 5 % of the aluminum, and 2 % of the titanium.• 0.5 M oxalic acid proved more effective at dissolving iron, titanium, and silicon.• 4 M nitric acid proved more effective at dissolving aluminum.• Decreasing the concentration of oxalic acid or nitric acid decreased the amount of solids dissolved. Decreasing the oxalic acid concentration to 0.25 M reduced the amount of iron (from 23 to 10 %), aluminum (from 15 to 10 %), and titanium (from 100 to 56 %) dissolved. Decreasing the nitric acid concentration from 4 M to 0.5 M decreased the amount of iron (from 18 to 3 %), aluminum (from 19 to 9 %), and titanium (from 89 to 7 %) dissolved.Based on these studies, the SPP should maintain 0.5 M oxalic acid as the baseline cleaning technology for the Salt Waste Processing Facility, and the Alpha Removal Project should use 0.5 M oxalic acid as their baseline cleaning solution.

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Dissolution behaviour of magnetite film formed over carbon steel in dilute organic acid media

Cited by 34 publications

References 7 publications

Corrosion Behavior of Alloy 600 Coupled with Electrodeposited Magnetite in Simulated Secondary Water of PWRs

Corrosion Behavior of Alloy 600 Coupled with Electrodeposited Magnetite in Simulated Secondary Water of PWRs

Galvanic Corrosion between Alloy 690 and Magnetite in Alkaline Aqueous Solutions

Investigation of Alternative Approaches for Cleaning Mott Porous Metal Filters

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