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A hot-dip process was used to produce a hydrogen permeation barrier on MANET II steel. The hot-dip aluminizing method produced an intermetallic layer of Al(3)Fe by immersing the specimens in molten aluminium at 1023 K for either 5 or 2 minutes. Subsequent heat-treatment of the samples at 1023 K for 15 h and 30 h respectively in air should transform the brittle Al(3)Fe layer in a more softer phase and additionally produce alumina on the surface.

All processes were carried out at temperatures below 1053 K in order to avoid the repetition of the whole heat-treatment of MANET to produce a fully martensitic delta-ferritic free structure (1348 K, 30 min fast cool; 1023 K, 2 h). The maximum obtained reduction in permeation, compared to the bare MANET II steel, has been obtained for the specimens oxidizing 15 h in air: around 260 times at 743 K and 1000 at 573 K.

Additional information

Authors: SERRA E, JRC Ispra (IT);PERUJO A, JRC Ispra (IT);GLASBRENNER H, Forschungszentrum Karlsruhe GmbH (DE)
Bibliographic Reference: Paper presented: ISFNT-4, Tokyo (JP), April 6-11, 1997
Availability: Available from (1) as Paper EN 40471 ORA
Record Number: 199710533 / Last updated on: 1997-05-09
Original language: en
Available languages: en
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