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鹽霧條件下NiCrAl涂層的耐腐蝕性研究
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教育部新世紀(jì)優(yōu)秀人才計(jì)劃(NCET2006)


Preparation of Sn-Doped RuO2 Film Electrode for Supercapacitor
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國(guó)家“863”高技術(shù)項(xiàng)目(2007AA03Z240)

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    摘要:

    采用大氣等離子噴涂工藝在Ni基高溫合金上制備NiCrAl涂層，并研究了該涂層在鹽霧腐蝕和氧化條件下的耐腐蝕性能。通過對(duì)NiCrAl涂層鹽霧腐蝕前后的極化曲線分析，可知NiCrAl涂層鹽霧腐蝕后的腐蝕電位變得更負(fù)，腐蝕電流密度變得更大，說明經(jīng)過鹽霧腐蝕后的NiCrAl涂層的耐腐蝕性明顯下降。由SEM觀察可知，NiCrAl涂層經(jīng)過鹽霧腐蝕后表面和內(nèi)部都出現(xiàn)了大量的裂紋，組織變得疏松，遭到嚴(yán)重腐蝕，涂層失去保護(hù)能力。經(jīng)EDX分析可知，腐蝕產(chǎn)物的化學(xué)通式為MexOyClz。經(jīng)過預(yù)氧化的NiCrAl涂層由于形成了θ-Al2O3膜，耐腐蝕性能增強(qiáng)

    Abstract:

    NiCrAl coatings were prepared on Ni-based superalloy through Atmospheric Plasma Spray (ASP), and the corrosion resistance of the coatings under the conditions of salt spray test and high-temperature oxidation was investigated. From the Tafel polarization curve of NiCrAl coatings before and after the salt spray test, it is shown that the corrosion potential of NiCrAl coatings becomes smaller while the corrosion current density becomes larger, indicating that the corrosion resistance of NiCrAl coatings after the salt spray test is decreased obviously. SEM images show that after the salt spray test, the corrosion of surface of the NiCrAl coatings is serious resulting from the appearance of many cracks and the loose microstructure, so the coatings have no protective capability. EDX analyses reveal that corrosion products are MexOyClz. After the thermal treatment at 1000 oC for 15 h, the corrosion resistance of NiCrAl coatings is enhanced because of the formation of θ-Al2O3 film

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李 垚,馬 彬,趙九蓬,魏慶元,蘇 柯.鹽霧條件下NiCrAl涂層的耐腐蝕性研究[J].稀有金屬材料與工程,2010,39(12):2181~2184.[Li Yao, Ma Bin, Zhao Jiupeng, Wei Qingyuan, Su Ke. Preparation of Sn-Doped RuO2 Film Electrode for Supercapacitor[J]. Rare Metal Materials and Engineering,2010,39(12):2181~2184.]
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  • 收稿日期:2009-12-15
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