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首页> 外文期刊>High temperature materials and processes >High Temperature Sulphidation of Composite Coatings on Cast Iron
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High Temperature Sulphidation of Composite Coatings on Cast Iron

机译：铸铁复合涂层的高温硫化

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摘要

A cast iron retort used for producing carbon disulphide in the Charcoal-Sulphur process usually has a lifespan of less than one year due to high-temperature corrosion. In order to improve the lifespan, two thermal-sprayed coating systems were investigated. One was an inner coating of a Fe-Cr-Al alloy surmounted by a top coating of aluminum, and the other was a single aluminum coating. After 576 hours exposure under the operating conditions, the specimens with arc-sprayed composite coatings showed a good resistance to sulphur attack. On the other hand, the results of the specimens with a single aluminum coating were found not to be satisfactory. The coatings and the coating/substrate interface were characterized by SEM, EPMA and X-ray diffraction. The results showed the existence of a reliable bonding between the composite coatings and the substrate with formation of the intermetallic compound AlCrFe_2 which was beneficial against the sulphur attack.
机译：在木炭-硫工艺中用于生产二硫化碳的铸铁干馏罐由于高温腐蚀通常寿命不到一年。为了提高使用寿命，研究了两种热喷涂涂层系统。一个是Fe-Cr-Al合金的内部涂层，上面覆盖着铝的顶部涂层，另一个是单层铝涂层。在操作条件下暴露576小时后，带有电弧喷涂复合涂层的样品显示出良好的抗硫侵蚀能力。另一方面，发现具有单个铝涂层的样品的结果不令人满意。通过SEM，EPMA和X射线衍射对涂层和涂层/基材界面进行表征。结果表明，随着金属间化合物AlCrFe_2的形成，复合涂层与基材之间存在可靠的结合，这有利于硫的侵蚀。

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