Mechanical and tribological properties of anodic Al coatings as a function of anodizing conditions

Dervishi-Whetham, Enkeleda; McBride, Michael; Edwards, Randall; Gutierrez, Moraya; Li, Nan; Buntyn, Raven; Hooks, Daniel Edwin

doi:10.1016/j.surfcoat.2022.128652

Title: Mechanical and tribological properties of anodic Al coatings as a function of anodizing conditions

Journal Article · Wed Jun 29 00:00:00 EDT 2022 · Surface and Coatings Technology

DOI:https://doi.org/10.1016/j.surfcoat.2022.128652· OSTI ID:1881816

^[1]; McBride, Michael ^[1]; Edwards, Randall ^[1]; Gutierrez, Moraya ^[1]; Li, Nan ^[1]; Buntyn, Raven ^[1];

^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Enhanced wear and corrosion resistance properties are vital for numerous functional and decorative applications. Anodizing is a process frequently used to generate stable oxide coatings on metal surfaces, including aluminium (Al). In this work, we present an evaluation of process variables for optimized anodized coating properties using existing methods and as a baseline for novel coating development. A representative relatively pure Al alloy was chosen as a model system with a goal of finding conditions to achieve high wear coatings with retained ductility. AA5052 alloy coupons were anodized in two different electrolytes (sulfuric and phosphoric acid) to study the effects of anodizing conditions on the mechanical and tribological properties of the anodic coatings. Porosity was evaluated with microscopy, coating hardness was determined via nanoindentation, and tribological properties were characterized using a pin-on-disk tribometer. These measurements were correlated and a loading evaluation was performed to assess the optimum nanoindentation parameters for the use of representative coupons without the need for special processing prior to anodizing. The porosity and coating thickness were found to depend on the anodizing time and the type of electrolyte. Thicker and harder anodic coatings were generated in sulfuric acid compared to phosphoric acid. Porosity studies of the anodic coatings generated in phosphoric acid revealed that coating porosity decreased as the anodizing time increased. Both electrolytes generated anodic coatings with improved tribological properties (friction coefficient and dimensional wear rate), and an optimum processing time was identified for best wear properties.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1881816

Alternate ID(s):: OSTI ID: 1961024

Report Number(s):: LA-UR-21-32123

Journal Information:: Surface and Coatings Technology, Vol. 444; ISSN 0257-8972

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Material science
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Title: Mechanical and tribological properties of anodic Al coatings as a function of anodizing conditions

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