Corrosion degradation behavior of alumina ceramics in hot sulfuric acid

Tetsuo Asano, Akira Okada, Satoshi Iio, Masahiro Yoshimura

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Corrosion behavior of 93 wt% alumina ceramics was investigated. The weight, the bending strength and the thickness of corroded layer were measured after exposed in sulfuric acid at temperatures of boiling point and 90°C. The weight decreased with time, but the weight loss rate became small. On the contrary, the thickness of corroded layer, which was determined by a porous zone depth formed on the surface of specimens as a result of dissolution of grain boundary phase, increased linearly with time. The bending strength decreased with an increase in the corroded layer depth. However, the morphology of fracture was inconsistent with the assumption that the corroded layer depth corresponds to a flaw dimension causing the failure. As large numbers of pore were observed on the fracture surface of the specimens, it was suggested that a combined flaw of the pore and the corrosion layer governs the strength of corroded alumina.

Original languageEnglish
Pages (from-to)589-592
Number of pages4
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume101
Issue number1173
DOIs
Publication statusPublished - 1993 Jan 1

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Aluminum Oxide
sulfuric acid
Sulfuric acid
Bending strength
corrosion
Alumina
aluminum oxides
ceramics
Corrosion
degradation
Degradation
Defects
Boiling point
flexural strength
Dissolution
Grain boundaries
porosity
defects
boiling
dissolving

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

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title = "Corrosion degradation behavior of alumina ceramics in hot sulfuric acid",
abstract = "Corrosion behavior of 93 wt{\%} alumina ceramics was investigated. The weight, the bending strength and the thickness of corroded layer were measured after exposed in sulfuric acid at temperatures of boiling point and 90°C. The weight decreased with time, but the weight loss rate became small. On the contrary, the thickness of corroded layer, which was determined by a porous zone depth formed on the surface of specimens as a result of dissolution of grain boundary phase, increased linearly with time. The bending strength decreased with an increase in the corroded layer depth. However, the morphology of fracture was inconsistent with the assumption that the corroded layer depth corresponds to a flaw dimension causing the failure. As large numbers of pore were observed on the fracture surface of the specimens, it was suggested that a combined flaw of the pore and the corrosion layer governs the strength of corroded alumina.",
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Corrosion degradation behavior of alumina ceramics in hot sulfuric acid. / Asano, Tetsuo; Okada, Akira; Iio, Satoshi; Yoshimura, Masahiro.

In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Vol. 101, No. 1173, 01.01.1993, p. 589-592.

Research output: Contribution to journalArticle

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