Electrochemical corrosion of Zircaloy-2 under PWR water chemistry but at room temperature

Waheed, A. F.; Kandil, A.; Hamed, Hani M.

doi:10.1016/j.anucene.2016.02.030

Cited by 8 publications

(3 citation statements)

References 4 publications

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“…Using equation (18), the corrosion rate of Zry-2 at a cladding gap of 0.08 mm is 2.405•10 −1 mm•py (mm per year) for both counter-electrodes. e C R value obtained in this work is high compared to the result of [28] that recorded a corrosion rate of 1.693•10 −3 mm•py. e difference is due to the water chemistry condition in the latter work (temperature = 298 K, pH = 6.8, and current density = 1.473•10 −3 A/ m 2 ), which is different from those in this work (temperature = 561 K, pH = 5.5, and current density = 2.1•10 −1 A/ m 2 ).…”

Section: Corrosion Rate Predictioncontrasting

confidence: 42%

Investigation of Oxidation and Counter-Oxidation in a One-Quarter Circular Geometry due to Shadow Corrosion

Enivweru

Wang

Ayodeji

2022

Science and Technology of Nuclear Installations

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To optimize fission fuel and protect cladding integrity, this work investigates shadow corrosion in a one-fourth circular electrode geometry. The anodic corrosion of Zircaloy-2 (Zry-2) was investigated in a circular geometry electrode configuration under reactor operating conditions. The impact of gamma and neutron radiations on water conductivity and shadow corrosion was examined under two different cathodes. This work also investigates the effect of current exchange density and the cathodic Tafel coefficient on the cathodic current. Using COMSOL Multiphysics 5.2, the Laplace equation was solved to obtain the electrostatic potential and current density distributions in the studied domain. When the distance d between the anode (Zry-2) and cathode (platinum/nickel) is ≤0.5 mm, it was observed that a uniform oxide layer of thickness 20 µm grew on the smooth internal surface of Zry-2 for corrosion lasting 1166 h. When d > 0.5 mm, the oxide thickness falls in a manner dictated by the degree of dissociation α of the electrolyte. At a cladding gap of 0.08 mm, a radiation-enhanced uniform corrosion rate of 2.405 10−1 mmpy was obtained for Zry-2. This value is 142 times greater than that obtained at room temperature in the absence of radiation. It was also observed that the corrosion rate falls at higher cladding gaps, and the rate of change depends on the degree of dissociation. Other phenomena such as the dynamics of shadow corrosion under varying electrode separation and electrolyte conductivities, as well as extensive evaluation of critical fuel cladding parameters, are presented in this work.

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Section: Corrosion Rate Predictioncontrasting

confidence: 42%

Investigation of Oxidation and Counter-Oxidation in a One-Quarter Circular Geometry due to Shadow Corrosion

Enivweru

Wang

Ayodeji

2022

Science and Technology of Nuclear Installations

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“…Namun belum dilakukan secara langsung di laboratorium. Selain itu telah dilakukan penelitian pengaruh penambahan Asam borat dengan rentang 50 -4000 ppm terhadap korosi Zr-2 dengan hasil semakin tinggi konsentrasi asam borat maka akan semakin meningkatkan laju korosi Zr-2 pada temperatur 25 ºC [11,13]. Namun penelitian tersebut belum menambahkan kombinasi dengan penambahan lithium hidroksida sesuai dengan rentang yang ada di kimia air PHWR.…”

Section: Pendahuluanunclassified

PENGARUH PENAMBAHAN LARUTAN H3BO3 DAN LiOH TERHADAP PERILAKU KOROSI MATERIAL KELONGSONG ZIRCALOY-2 DALAM MEDIA AIR BEBAS MINERAL

Afghani¹,

Hermawan²,

Putri³

et al. 2022

urania

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PENGARUH PENAMBAHAN LARUTAN H3BO3 DAN LiOH TERHADAP PERILAKU KOROSI MATERIAL KELONGSONG ZIRCALOY-2 DALAM MEDIA AIR BEBAS MINERAL. Pendingin primer pada reaktor tipe PHWR dikendalikan secara kimia dengan penambahan asam borat dan LiOH untuk mengantisipasi korosi pada kelongsong bahan bakar yang menggunakan material zircaloy-2 (Zr-2.) Penelitian ini bertujuan untuk menganalisis pengaruh penambahan larutan H3BO3 dan LiOH terhadap jenis dan laju korosi material kelongsong bahan bakar Zr-2 dalam media air bebas mineral. Penambahan bahan H3BO3 dan LiOH pada pendingin reaktor PHWR adalah untuk pengendalian secara kimia. Uji korosi dilakukan pada temperatur kamar untuk menghilangkan pengaruh temperatur tinggi dan tekanan pada proses elektrokimia. Pada penelitian ini dilakukan pengamatan laju korosi material Zr-2 di dalam media air bebas mineral dengan penambahan H3BO3 dan LiOH dengan variasi konsentrasi. Hasil pengamatan, laju korosi Zr-2 menggunakan metode Tafel pada dalam media air bebas mineral dengan penambahan H3BO3 pada konsentrasi 10 ppm, 100 ppm, 500 ppm, 1000 ppm dan 2000 ppm diperoleh laju korosi masing masing 17,29 x 10-3 mpy, 18,51 x 10-3 mpy, 20,82 x 10-3 mpy, 22,71 x 10-3 mpy dan 23,29 x 10-3 mpy. Setelah air bebas mineral, kemudian ditambahkan H3BO3 sebesar 2000 ppm dan LiOH dengan konsentrasi 1 ppm, 2 ppm, 3 ppm, 4 ppm. Hasil analisis menunjukkan bahwa dengan penambahan H3BO3 dan LiOH diperoleh laju korosi semakin menurun secara berurutan yaitu 22,71 x 10-3 mpy, 21,88 x 10-3 mpy, 21.41 x 10-3 mpy, 21,39 x 10-3 mpy, dan penambahan LiOH 5 ppm menyebabkan laju korosi meningkat menjadi 21,45 x 10-3 mpy. Hasil penelitian ini dapat disimpulkan bahwa penambahan LiOH dan H3BO3 berpengaruh terhadap laju korosi material zircaloy-2 dalam media air bebas mineral. Semakin tinggi konsentrasi H3BO3 yang ditambahkan menyebabkan laju korosi semakin meningkat, sedangkan dengan penambahan LiOH menyebabkan laju korosi semakin menurun hingga konsentrasi 4 ppm Namun dengan penambahan LiOH pada konsentrasi 5 ppm menyebabkan laju korosi meningkat sehingga dapat disimpulkan bahwa konsentrasi optimum penambahan LiOH adalah 4 ppm.Kata kunci: zircaloy-2, laju korosi, H3BO3, LiOH, kelongsong

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“…Compare with autoclave test, it is possible to produce oxide films in short times [12]. The experiments device and the electrochemical parameters are described elsewhere [15][16][17]. The surface of the formed oxide on specimen was examined by SEM, JEOL JSM 5400.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Effect of Acidic and Alkaline Solutions on Electrochemical Corrosion of Zircaloy-2

Waheed¹,

Kame²,

Hamed³

2018

IJASTR

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Electrochemical corrosion of zircalloy-2 in solution containing B-ion as boric acid was tested at room temperature. The results show that the presence of boron has a small effect on the corrosion rates of Zircaloy-2. The tests were conducted in boric concentrations ranged from 50 to 1100 ppm. The effect of boric acid is due to a reduction of PH. Electrochemical corrosion of zicaloy-2 was tested also, in sodium hydroxide (NaOH) and potassium hydroxide (KOH) solutions, to compare the results with that of (LiOH) from previous work. The concentrations of these alkaline media ranged from 0.5M to 1M. Both NaOH and KOH have a slight effect on corrosion rate, while LiOH of 1M led to significant increase in corrosion rate. The surface of the specimens was tested by SEM.

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Electrochemical corrosion of Zircaloy-2 under PWR water chemistry but at room temperature

Cited by 8 publications

References 4 publications

Investigation of Oxidation and Counter-Oxidation in a One-Quarter Circular Geometry due to Shadow Corrosion

Investigation of Oxidation and Counter-Oxidation in a One-Quarter Circular Geometry due to Shadow Corrosion

PENGARUH PENAMBAHAN LARUTAN H3BO3 DAN LiOH TERHADAP PERILAKU KOROSI MATERIAL KELONGSONG ZIRCALOY-2 DALAM MEDIA AIR BEBAS MINERAL

Effect of Acidic and Alkaline Solutions on Electrochemical Corrosion of Zircaloy-2

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