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首页> 外文期刊>Materials at High Temperatures >Corrosion behavior of ferritic steels on the air sides of boiler tubes in a steam/air dual environment
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Corrosion behavior of ferritic steels on the air sides of boiler tubes in a steam/air dual environment

机译：蒸汽/空气双重环境中铁素体钢在锅炉管空气侧的腐蚀行为

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摘要

The corrosion behavior of heat resistant ferritic steels for boiler tubes in a steam/air dual environment simulating the non heated areas at 600 deg C has been investigated. Corrosion rates of the ferritic steels on the air sides under a condition of steam/air dual environments were increased more significantly than those in simple air conditions because of the permeation hydrogen from the steam side. Amounts of hydrogen permeated through the test tubes were measured electrochemically using a proton conductive solid electrolyte (5mol percent Y_2O_3-SrCeO_3) The results of hydrogen permeation current measurements show that the amount of permeated hydrogen from the steam sides decreased parabolically with time and decreased with increasing Cr content in the steels. The corrosion attack of the outer surfaces saturated under a certain permeated hydrogen level and the marginal hydrogen content needed to accelerate the corrosion of the air side depended on the Cr content in the steel. Therefore, a part of the permeated hydrogen react with oxygen to form H_2O at the metal/oxide interface on the air sides. That is, the corrosion mechanism may be the same as that of steam oxidation.
机译：研究了用于蒸汽管/空气双重环境的耐热铁素体钢在模拟600摄氏度非加热区域时的腐蚀行为。在蒸汽/空气双重环境下，铁素体钢在空气侧的腐蚀速率比在简单的空气条件下显着提高，这是因为氢从蒸汽侧渗透。使用质子传导性固体电解质（5％（摩尔）Y_2O_3-SrCeO_3）以电化学方式测量通过试管的氢的渗透量。氢渗透电流的测量结果表明，蒸汽侧的氢渗透量随时间呈抛物线型下降，并随时间的增加而下降。钢中的Cr含量。在一定的渗透氢水平下饱和的外表面的腐蚀攻击以及加速空气侧腐蚀所需的边际氢含量取决于钢中的Cr含量。因此，一部分渗透的氢与氧反应，在空气侧的金属/氧化物界面形成H_2O。即，腐蚀机理可以与蒸汽氧化的腐蚀机理相同。

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