English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The diffusivity of hydrogen in cold-rolled pure iron is investigated usingpermeation and desorption methods. Electrochemical charging, electro-permeationand thermal desorption spectroscopy (TDS) experiments are conducted. Firstly,the relation between the charging current and the hydrogen concentration isestablished. Secondly, permeation experiments are conducted at 22, 40 and67{\deg}C to quantify the diffusivity dependence on temperature. Finally, thediffusivity is estimated by using two types of desorption experiments andFick's law: (i) a `rest time' method, by which we measure the hydrogen contentof samples held at room temperature for different times, and (ii) isothermaldesorption experiments at temperatures ranging from 22 to 80{\deg}C, fittingthe resulting desorption rate versus time curves. Good agreement is obtainedbetween the isothermal desorption and permeation approaches, with observeddifferences discussed and rationalised. Moreover, measured diffusivity valuesfor cold-rolled pure iron are also found to be comparable to those reported inthe literature. This work demonstrates that isothermal desorption experimentsare a convenient approach to determine hydrogen diffusivity over a wide rangeof temperatures, as facilitated by new TDS systems with fast heating rates.

Comparison of hydrogen diffusivities measured by electrochemical permeation and temperature-programmed desorption in cold-rolled pure iron