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含碲鈷基高溫合金熔鹽腐蝕行為探討
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蘭州理工大學(xué) 省部共建有色金屬先進(jìn)加工與再利用國(guó)家重點(diǎn)實(shí)驗(yàn)室,蘭州理工大學(xué) 材料科學(xué)與工程學(xué)院

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TG146.1+6

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Corrosion behavior of cobalt-based superalloys with tellurium in molten salt
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State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metal，Lanzhou Univ. of Technology,College of Materials Science and Engineering，Lanzhou Univ. of Technology

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    摘要:

    非真空環(huán)境下燒結(jié)不同Te含量的鈷基合金粉末，研究其在靜態(tài)800±5℃75%Na2SO4+25%NaCl下的高溫熔鹽腐蝕行為，采用OM、SED和 XRD衍射儀分析了合金金相組織、腐蝕產(chǎn)物形貌和物相組成。結(jié)果表明：隨著鈷基合金中含Te質(zhì)量分?jǐn)?shù)的增加，合金的高溫熔鹽腐蝕速率逐漸降低；當(dāng)Te含量為1.6wt%左右時(shí)，合金基體表面形成均勻、致密的Cr2O3氧化保護(hù)膜及彌散在基體中的新相（CoTeO3、Fe2TeO5）抑制Co原子向晶界擴(kuò)散，延緩合金基體元素溶解，平均腐蝕速率由不含Te的4.0483mg/(cm2*h)降低至0.216mg/(cm2*h) ，提高合金熱腐蝕性能。

    Abstract:

    the corrosion behavior of cobalt-based alloy powder with different Te content that was sintered under non-vacuum environment is researched high temperature molten salt in a static 800±5℃75% Na2SO4+25% NaCl high temperature molten salt. Making use of OM, SEM and XRD diffraction analyze the alloy microstructure, corrosion product morphology and phase composition, and the results show that: with the increase of Te mass fraction in cobalt-based alloy, high-temperature molten salt corrosion rate decreased gradually; when the Te content is about 1.6wt%, the alloy substrate surface form a kind of homogeneous and dense Cr2O3 protection oxide film and the new phase (CoTeO3, Fe2TeO5) dispersed in the matrix to inhibit Co atoms diffusing to grain boundaries, which retard alloy matrix element dissolution and improve the performance of the alloy hot corrosion. Corrosion rate of cobalt-based alloy decreases from free Te 4.0483mg/(cm2*h) to 0.216mg/(cm2*h).

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蘇義祥,劉解放.含碲鈷基高溫合金熔鹽腐蝕行為探討[J].稀有金屬材料與工程,2018,47(8):2446~2452.[Su Yi-xiang, Liu Jie-fang. Corrosion behavior of cobalt-based superalloys with tellurium in molten salt[J]. Rare Metal Materials and Engineering,2018,47(8):2446~2452.]
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  • 收稿日期:2016-08-12
  • 最后修改日期:2016-11-18
  • 錄用日期:2016-12-02
  • 在線發(fā)布日期: 2018-10-17
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