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Evaluation of Non-Chromate Passivations on Electroplated gamma-Phase Zinc Nickel.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Evaluation of Non-Chromate Passivations on Electroplated gamma-Phase Zinc Nickel./
Author:	Volz, Steven Michael.
Description:	1 online resource (91 pages)
Notes:	Source: Masters Abstracts International, Volume: 56-05.
Subject:	Materials science. -
Online resource:	click for full text (PQDT)
ISBN:	9780355087888

Evaluation of Non-Chromate Passivations on Electroplated gamma-Phase Zinc Nickel.
Volz, Steven Michael.

Evaluation of Non-Chromate Passivations on Electroplated gamma-Phase Zinc Nickel. - 1 online resource (91 pages)

Source: Masters Abstracts International, Volume: 56-05.

Thesis (M.S.)--Missouri University of Science and Technology, 2017.

Includes bibliographical references

This research focused on the corrosion response and electrochemical behavior of electroplated low hydrogen embrittlement alkaline gamma-phase zinc nickel with passivation layers. The motivation was the need to replace hexavalent chromium conversion coatings in military grade electrical systems with a more environment friendly alternative. The passivation layers were employed for the purpose of mitigating corrosion attack while maintaining low contact resistance. Trivalent chromium-based passivations and cerium-based passivations were compared against the currently used hexavalent chromium conversion coating. The coating systems were compared using electrochemical impedance spectroscopy, cyclic potentiodymanic scans, salt spray exposure testing, electrical resistance measurements, microstructure analysis, and compositional analysis. Coating systems with lower open circuit had a lower corrosion current and performed better during salt spray testing. All of the systems evaluated had corrosion products consistent with oxidized zinc compounds but the morphology of the passivation was dependent on the passivation. The electrical contact resistance ranged from 1 to 108 mO/cm 2, after salt spray testing. Two versions of Trivalent chromium-based passivations, were able to meet military performance specifications after corrosion testing.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355087888Subjects--Topical Terms:

557839
Materials science.
Index Terms--Genre/Form:

554714
Electronic books.

Evaluation of Non-Chromate Passivations on Electroplated gamma-Phase Zinc Nickel.
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245 1 0 $a Evaluation of Non-Chromate Passivations on Electroplated gamma-Phase Zinc Nickel.
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300 $a 1 online resource (91 pages)
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500 $a Source: Masters Abstracts International, Volume: 56-05.
500 $a Advisers: Matthew J. O'Keefe; William G. Fahrenholtz.
502 $a Thesis (M.S.)--Missouri University of Science and Technology, 2017.
504 $a Includes bibliographical references
520 $a This research focused on the corrosion response and electrochemical behavior of electroplated low hydrogen embrittlement alkaline gamma-phase zinc nickel with passivation layers. The motivation was the need to replace hexavalent chromium conversion coatings in military grade electrical systems with a more environment friendly alternative. The passivation layers were employed for the purpose of mitigating corrosion attack while maintaining low contact resistance. Trivalent chromium-based passivations and cerium-based passivations were compared against the currently used hexavalent chromium conversion coating. The coating systems were compared using electrochemical impedance spectroscopy, cyclic potentiodymanic scans, salt spray exposure testing, electrical resistance measurements, microstructure analysis, and compositional analysis. Coating systems with lower open circuit had a lower corrosion current and performed better during salt spray testing. All of the systems evaluated had corrosion products consistent with oxidized zinc compounds but the morphology of the passivation was dependent on the passivation. The electrical contact resistance ranged from 1 to 108 mO/cm 2, after salt spray testing. Two versions of Trivalent chromium-based passivations, were able to meet military performance specifications after corrosion testing.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Materials science. $3 557839
655 7 $a Electronic books. $2 local $3 554714
690 $a 0794
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Missouri University of Science and Technology. $b Materials Science and Engineering. $3 1185115
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