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Title: Mechanical properties of anodized coatings over molten aluminum alloy

Abstract

A method to measure interfacial mechanical properties at high temperatures and in a controlled atmosphere has been developed to study anodized aluminum surface coatings at temperatures where the interior aluminum alloy is molten. This is the first time that the coating strength has been studied under these conditions. In this study, we have investigated the effects of ambient atmosphere, temperature, and surface finish on coating strength for samples of aluminum alloy 7075. Surprisingly, the effective Young's modulus or strength of the coating when tested in air was twice as high as when samples were tested in an inert nitrogen or argon atmosphere. Additionally, the effective Young's modulus of the anodized coating increased with temperature in an air atmosphere but was independent of temperature in an inert atmosphere. The effect of surface finish was also examined. Sandblasting the surface prior to anodization was found to increase the strength of the anodized coating with the greatest enhancement noted for a nitrogen atmosphere. Lastly, machining marks were not found to significantly affect the strength.

Authors:
 [1];  [1];  [2];  [3];  [4];  [5];  [2]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Microscale Science and Technology
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Thermal, Fluid, and Aero Experimental Sciences
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Materials Characterization
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Thin Film, Vacuum, and Packaging
  5. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). MEMS Core Technologies
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1426942
Report Number(s):
SAND-2007-2775J
Journal ID: ISSN 0021-9797; 498630
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Colloid and Interface Science
Additional Journal Information:
Journal Volume: 317; Journal Issue: 1; Journal ID: ISSN 0021-9797
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Microindentation; Aluminum alloy; Anodization; Film strength; High temperature

Citation Formats

Grillet, Anne M., Gorby, Allen D., Trujillo, Steven M., Grant, Richard P., Hodges, V. Carter, Parson, Ted B., and Grasser, Thomas W. Mechanical properties of anodized coatings over molten aluminum alloy. United States: N. p., 2007. Web. doi:10.1016/j.jcis.2007.08.045.
Grillet, Anne M., Gorby, Allen D., Trujillo, Steven M., Grant, Richard P., Hodges, V. Carter, Parson, Ted B., & Grasser, Thomas W. Mechanical properties of anodized coatings over molten aluminum alloy. United States. doi:10.1016/j.jcis.2007.08.045.
Grillet, Anne M., Gorby, Allen D., Trujillo, Steven M., Grant, Richard P., Hodges, V. Carter, Parson, Ted B., and Grasser, Thomas W. Mon . "Mechanical properties of anodized coatings over molten aluminum alloy". United States. doi:10.1016/j.jcis.2007.08.045. https://www.osti.gov/servlets/purl/1426942.
@article{osti_1426942,
title = {Mechanical properties of anodized coatings over molten aluminum alloy},
author = {Grillet, Anne M. and Gorby, Allen D. and Trujillo, Steven M. and Grant, Richard P. and Hodges, V. Carter and Parson, Ted B. and Grasser, Thomas W.},
abstractNote = {A method to measure interfacial mechanical properties at high temperatures and in a controlled atmosphere has been developed to study anodized aluminum surface coatings at temperatures where the interior aluminum alloy is molten. This is the first time that the coating strength has been studied under these conditions. In this study, we have investigated the effects of ambient atmosphere, temperature, and surface finish on coating strength for samples of aluminum alloy 7075. Surprisingly, the effective Young's modulus or strength of the coating when tested in air was twice as high as when samples were tested in an inert nitrogen or argon atmosphere. Additionally, the effective Young's modulus of the anodized coating increased with temperature in an air atmosphere but was independent of temperature in an inert atmosphere. The effect of surface finish was also examined. Sandblasting the surface prior to anodization was found to increase the strength of the anodized coating with the greatest enhancement noted for a nitrogen atmosphere. Lastly, machining marks were not found to significantly affect the strength.},
doi = {10.1016/j.jcis.2007.08.045},
journal = {Journal of Colloid and Interface Science},
number = 1,
volume = 317,
place = {United States},
year = {2007},
month = {10}
}

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