English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Micro-arc oxidation (MAO) is an anodizing technique applied to valve metals. With MAO, a crystalline aluminum oxide layer can be grown on aluminum alloys. This paper examines MAO as a surface treatment for metals for vacuum use. A 17.6 μm-thick MAO layer was grown on an A5052 aluminum alloy surface employing 50 Hz AC and a maximum of 450 V. This oxide layer contained α-alumina and γ-alumina crystalline aluminum oxide, and actually consisted of two distinct layers: first, a dense layer about 500 nm thick directly on the substrate, and, second, a 17 μm-thick layer on the dense layer which included numerous voids, each about 10 μm in size. Neither layer had the fine pores - 20-30 nm-structures - exhibited by alumite film. The outgassing rate of a MAO-treated A5052 sample after 10 hours of evacuation was 1.0×10-5 Pa•m3•s-1•m-2, i.e., 1/30 that of alumite with sulfuric acid. The most dominant gas species was water. The MAO sample's corrosion resistance to hydrochloric acid was the same as that of an alumite sample.

Outgassing Properties of Micro-ark Oxidized Aluminum Alloys