Retraction Watch

Tracking retractions as a window into the scientific process

Nuclear fuel container material isn’t as novel as it appeared in now-retracted paper

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A layer of copper sprayed onto steel. (Figure 6 from “Structure and Mechanical Properties of Thick Copper Coating Made by Cold Spray“)

A paper describing the construction of a material that could be used in nuclear fuel containers has been retracted after the authors left out key details.

According to the editor, the omission made the authors’ method seem more novel than it was.

The material is described in “Structure and Mechanical Properties of Thick Copper Coating Made by Cold Spray.” It was published in the January 2016 issue of the Journal of Thermal Spray Technology.

According to the retraction notice, the authors did not specify in the paper how the first layer of copper was sprayed onto the steel:

This article has been retracted after further review by the JTST Editorial Board as the deposition of a sublayer was ignored; yet this layer was the primary focus of the paper. Also, the essential data concerning deposition of the sublayer were omitted as the sublayer was deposited using helium as the propellant gas, while the thick copper coating was deposited using nitrogen as the propellant gas.

We asked the journal’s editor in chief, Armelle Vardelle, why it was a problem that the authors used helium instead of nitrogen to spray the first layer of the material. She said:

The authors [didn’t] explain which propellant gas they used for the sublayer. Therefore, the readers could think that both the sub-layer and layer were deposited with the same propellant gas (nitrogen) which would be  much [more] favorable for industrial applications and  has not  been done before for cold-sprayed thick copper coatings on carbon steel substrates.

Once it was clear that the propellant gas was helium, the paper lacked technical significance and decision was taken to retract it.

She told us how she discovered the omission:

Other authors submitted later [a] paper in which they claimed to be the first to have deposited by cold spray a thick copper coating on steel by using the same propellant gas (nitrogen) both for the first layer and coating.

We asked why the omission wasn’t caught in peer review. She said:

I suppose because if the reviewers have not tried to deposit the same coating under the same spray coatings, it is not straightforward to find that there was an omission in the spray conditions.

All six authors are listed at the Institute for Diagnostic Imaging Research at the University of Windsor. First author Roman Maev is the director of the institute. We’ve reached out to Maev, to last author, Elena Maeva, and to corresponding author Volf Leshchynsky. (Maev and Maeva are married, according to this Windsor Star article.) We have not yet heard back.

Vardelle told us:

The authors acknowledged the omission and stated that the omission was inadvertent on their part.

The article has not been cited, according to Clarivate Analytics’ Web of Science, formerly part of Thomson Reuters.

Hat tip: Rolf Degen 

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