GDOES analysis of niobium de-hydrogenation after electropolishing processes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27350%2F18%3A10239150" target="_blank" >RIV/61989100:27350/18:10239150 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0167577X18302234" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0167577X18302234</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.matlet.2018.02.027" target="_blank" >10.1016/j.matlet.2018.02.027</a>

Jazyk výsledku

angličtina

Název v původním jazyce

GDOES analysis of niobium de-hydrogenation after electropolishing processes

Popis výsledku v původním jazyce

Niobium, as pure metal and alloying element, is used in a variety of applications, among them in nuclear industries. Niobium is incorporated into nuclear fission reactors due to its enormous strength and relatively low density. Surface finishing of niobium is often performed in electrochemical polishing processes in view of improving its smoothness, corrosion resistance and its surface cleanability. However, the presently used electropolishing process (EP) is intrinsically linked to the subsurface hydrogenation of niobium, which measurably degrades its properties. The annealing operation, which is used to remove hydrogen from electropolished niobium, is quite a costly and time-consuming process. The traditional electrolyte consisting of a mixture of 96% H2SO4/49% HF acids by volume in a 9:1 ratio has been substituted for the new one, being a mixture of 70% methanesulfonic acid with 49% hydrofluoric acid by volume in a 3:1 ratio. The additional imposition of a magnetic field during the electropolishing process - magnetoelectropolishing (MEP) further increases hydrogen removal, when compared to the hydrogen content achieved by the electropolishing process (EP) alone. The aim of the study is to reveal a methodic approach and showing decreasing hydrogenation of niobium samples after consecutive steps of electrochemical polishing. Glow-Discharge Optical Emission Spectroscopy (GDOES) measurements were used to measure the hydrogen content in the surface layer of as-received (AR) niobium and in the samples after EP and MEP processes, and prove its close-to-zero content after MEP. (C) 2018 Elsevier B.V.

Název v anglickém jazyce

GDOES analysis of niobium de-hydrogenation after electropolishing processes

Popis výsledku anglicky

Niobium, as pure metal and alloying element, is used in a variety of applications, among them in nuclear industries. Niobium is incorporated into nuclear fission reactors due to its enormous strength and relatively low density. Surface finishing of niobium is often performed in electrochemical polishing processes in view of improving its smoothness, corrosion resistance and its surface cleanability. However, the presently used electropolishing process (EP) is intrinsically linked to the subsurface hydrogenation of niobium, which measurably degrades its properties. The annealing operation, which is used to remove hydrogen from electropolished niobium, is quite a costly and time-consuming process. The traditional electrolyte consisting of a mixture of 96% H2SO4/49% HF acids by volume in a 9:1 ratio has been substituted for the new one, being a mixture of 70% methanesulfonic acid with 49% hydrofluoric acid by volume in a 3:1 ratio. The additional imposition of a magnetic field during the electropolishing process - magnetoelectropolishing (MEP) further increases hydrogen removal, when compared to the hydrogen content achieved by the electropolishing process (EP) alone. The aim of the study is to reveal a methodic approach and showing decreasing hydrogenation of niobium samples after consecutive steps of electrochemical polishing. Glow-Discharge Optical Emission Spectroscopy (GDOES) measurements were used to measure the hydrogen content in the surface layer of as-received (AR) niobium and in the samples after EP and MEP processes, and prove its close-to-zero content after MEP. (C) 2018 Elsevier B.V.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materials letters

ISSN

0167-577X

e-ISSN

—

Svazek periodika

218

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

299-304

Kód UT WoS článku

000427452200074

EID výsledku v databázi Scopus

2-s2.0-85042058305