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Pilling–Bedworth ratio
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Pilling–Bedworth ratio : ウィキペディア英語版
Pilling–Bedworth ratio
The Pilling–Bedworth ratio (P–B ratio), in corrosion of metals, is the ratio of the volume of the elementary cell of a metal oxide to the volume of the elementary cell of the corresponding metal (from which the oxide is created).
On the basis of the P–B ratio, it can be judged if the metal is likely to passivate in dry air by creation of a protective oxide layer.
==Definition==
The P–B ratio is defined as:
: \mathrm} \cdot \rho_} } }
where:
* RPB is the Pilling–Bedworth ratio,
* M – the atomic or molecular mass,
* n – number of atoms of metal per one molecule of the oxide
* ρ – density, and
* V – the molar volume.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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