Oxidation Resistance and Corrosion Resistance of Molybdenum-Chromium Nitride Layer

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  • Mo-Cr系窒化物皮膜の耐酸化性と耐食性
  • Mo Crケイ チッカブツ ヒマク ノ タイサンカセイ ト タイショクセイ

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For Mo-Cr nitride layer prepared by NH3 gas nitriding of pure Mo subjected to Cr-diffusion treatment, the oxidation behavior in air and corrosion behavior in boiling sulfuric acid were investigated. The surface nitride layer consisted of γ-Mo2N type solid solution of which Mo-Cr ratio was almost 1 : 1 on the surface. Although γ-Mo2N layer obtained by nitriding pure Mo was oxidized at temperatures above 773 K, Mo-Cr nitride layer exhibited superior oxidation resistance up to 1073 K. The corrosion resistance of Mo-Cr nitride layer in boiling sulfuric acid was as excellent as that of γ-Mo2N layer.

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