Oxygen and Water Vapour Oxidation of 15Cr Ferritic Stainless Steels with Different Silicon Contents
Oxygen and Water Vapour Oxidation of 15Cr Ferritic Stainless Steels with Different Silicon Contents
复制标题
不同硅含量15Cr铁素体不锈钢的氧气和水蒸气氧化
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
J. Petit
中科院分区：
文献类型：
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作者：
Y. Wouters;G. Bamba;A. Galerie;M. Mermoux;J. Petit
用作汽车排气部件(歧管、管子)的稳定铁素体不锈钢在有水蒸气存在的情况下，当较大的含铁氧化物结瘤迅速生长以取代薄的铬化物保护层时，通过分离氧化可大大缩短其使用寿命。这种现象发生在一定的孕育时间之后，并被证明受到不锈钢的成分，特别是其硅含量的影响。本文对剥离前的氧化膜进行了详细的光电化学表征，研究了氧化膜中铬含量的变化规律。在900°C的热氧化过程中，与钢接触形成的富硅氧化物在氧气或水蒸气(150mbar)中形成时，显示出不同的PEC特征。
The life time of stabilized ferritic stainless steels used as car exhaust parts (manifolds, tubes) can be largely reduced in the presence of water vapour, by breakaway oxidation when big iron-containing oxides nodules rapidly grow in place of the thin chromiarich protective scale. This phenomenon occurs after a certain incubation time and was shown to be influenced by the composition of the stainless steel, particularly by its silicon content. In this paper, a detailed photoelectrochemical characterization of the oxide scales prior to breakaway is presented in function of the chromium content. The silicon-rich oxide formed in contact with the steel during thermal oxidation at 900°C is shown to exhibit a different PEC signature when formed in oxygen or in water vapour (150 mbar).