Masters Theses

Keywords and Phrases

Cerium-based Conversion Coating; Corrosion; Electrical Connector; Hexavalent Chromium Conversion Coating; Trivalent Chromium Passivation; Zinc Nickel

Abstract

"This research focused on the corrosion response and electrochemical behavior of electroplated low hydrogen embrittlement alkaline γ-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 mΩ/cm2, after salt spray testing. Two versions of Trivalent chromium-based passivations, were able to meet military performance specifications after corrosion testing"--Abstract, page iv.

Advisor(s)

O'Keefe, Matthew
Fahrenholtz, William

Committee Member(s)

Schlesinger, Mark E.

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Materials Science and Engineering

Sponsor(s)

Strategic Environmental Research and Development Program (U.S.)

Comments

The Strategic Environmental Research and Development Program (SERDP) provided the support necessary to complete this project through project SEED WP-2527.

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2017

Journal article titles appearing in thesis/dissertation

  • Corrosion behavior and contact resistance of electroplated γ-ZnNi with passivation layers
  • Characterization of electroplated γ-ZnNi with passivation layers

Pagination

xii, 77 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2017 Steven Michael Volz

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 11125

Electronic OCLC #

992440764

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