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@PHDTHESIS{Gommlich:713102,
author = {Gommlich, Tim},
othercontributors = {Bleck, Wolfgang Peter and Schmitt, Günter},
title = {{Z}ur {V}ermeidung von {W}asserstoffschäden am
höchstfesten {S}tahl 300{M} bei der galvanischen
{A}bscheidung von {Z}ink-{N}ickel-Überzügen},
volume = {1/2018},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Aachen},
publisher = {Shaker},
reportid = {RWTH-2018-00919},
isbn = {978-3-8440-5717-1},
series = {Berichte aus dem Institut für Eisenhüttenkunde},
pages = {1 Online-Ressource (III, 162 Seiten)},
year = {2017},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University; Dissertation, RWTH Aachen University, 2017},
abstract = {For corrosion protection of high strength steels
electroplated cadmium coatings are still applied in safety
relevant applications like in the military and aviation
sector because of their excellent characteristics. But
cadmium should be replaced due to its toxicity. The most
promising alternative are zinc-nickel alloy coatings with 10
- $14\%$ nickel. However, like cadmium deposition also ZnNi
plating implicates the risk of hydrogen embrittlement of
high strength steel base material. While for cadmium
electroplating this problem has been solved since decades, a
non-embrittling process for ZnNi electrodeposition has not
yet been developed. This was the aim of the present work
performed within a publicly funded joint industry project.
By in-situ hydrogen permeation measurements the parameters
of a commercial ZnNi deposition process were modified to
minimize the hydrogen uptake of the high strength steel
300M. By total hydrogen balancing it was determined for the
first time, which percentage of the total amount of hydrogen
produced was absorbed by the material and how this
percentage influences the embrittlement behaviour of the
steel. For successful prevention of hydrogen embrittlement
it was proved to be fundamental to choose process parameters
that yield an appropriate morphology of the ZnNi coating
which facilitates the effusion of the absorbed hydrogen
during thermal treatment. By measurements of hydrogen
effusion the critical hydrogen concentration range was
determined. Thus, it was found that ZnNi, Ni and Zn coatings
can store significant amounts of diffusible hydrogen which
can diffuse into the steel base material at a later time and
cause hydrogen embrittlement. In case of bright-Cd coatings
a differing behaviour was found indicating a separate
failure mechanism. The investigations performed resulted in
a non-embrittling galvanic ZnNi deposition process for high
strength steels which currently is in the industrialization
phase.},
cin = {520000 / 522110},
ddc = {620},
cid = {$I:(DE-82)520000_20140620$ / $I:(DE-82)522110_20140620$},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
doi = {10.18154/RWTH-2018-00919},
url = {https://publications.rwth-aachen.de/record/713102},
}
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