Hydrogen Permeation Test Analysis (HPT)

Hydrogen permeation is a process in which hydrogen penetrates and accumulates into the bulk of high tensile stress stainless steel alloys that introduces a cracking hazard. The ASTM G148 procedure explains the use of the hydrogen permeation test using a Devanathan-Stachurski Cell.
Electrochemically controlled hydrogen permeation is measured using two electrolytic cells that are separated by a membrane made from the metal being investigated. Hydrogen is generated electrochemically at the cathode, whereas the hydrogen that has diffused through the metal membrane is oxidized at a constant potential at the anode. The oxidation current is directly proportional to the amount of hydrogen diffusing through the metal membrane.

Application: Hydrogen permeation experiments with PGSTAT302F (Download)

Application Note: (PGSTAT 302F) x 2