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Effects of Chlorate on the Hot Corrosion Behaviors of Cr0.82Al0.18N Coating Deposited on a Ti3Al Based Alloy
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Effects of Chlorate on the Hot Corrosion Behaviors of Cr0.82Al0.18N Coating Deposited on a Ti3Al Based Alloy
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National Natural Science Foundation of China (51201131); Natural Science Basic Research Plan of Education Ministry of Shaanxi Province of China (11JK0811)

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    摘要:

    為了研究氯化物熔鹽對Cr-Al-N涂層熱腐蝕性能的影響，采用反應磁控濺射的方法在Ti3Al合金表面制備了Cr0.82Al0.18N涂層，研究了涂層在Na2SO4 + 25% K2SO4和Na2SO4 + 25% NaCl (質(zhì)量分數(shù)) 2 種熔鹽中的熱腐蝕行為，采用XRD和SEM分析了涂層熱腐蝕產(chǎn)物的相組成和形貌。結(jié)果表明：涂層在含有氯化物鹽的熔鹽中腐蝕時表現(xiàn)為失重而在硫酸鹽中腐蝕時表現(xiàn)為增重；Cr0.82Al0.18N涂層在 2 種熔鹽中的腐蝕都主要由Cr2O3和q-Al2O3組成。氯化物熔鹽和腐蝕產(chǎn)物的揮發(fā)導致了在含有氯化物熔鹽中腐蝕時的失重現(xiàn)象。當含有氯化物鹽時會增加熔鹽中氧離子的活度，從而加速Cr2O3在熔鹽中的溶解。此外，熱腐蝕過程中產(chǎn)生的氯氣也會參與腐蝕反應，從而加速涂層的消耗。

    Abstract:

    Cr0.82Al0.18N coating was deposited on the surface of a Ti3Al base alloy by a reactive magnetron sputtering method and the hot corrosion behaviors of this coating in Na2SO4 +25 wt% K2SO4 and Na2SO4 +25 wt% NaCl molten salt were investigated. XRD and SEM were used to analyze the phase constituents and the morphologies of the corrosion products. The results show that the sample loses its mass when corroded in sulfate and chlorate mixture molten salts while the mass increases when corroded in sulfate molten salt and the corrosion products formed in both two kinds of molten salts are mainly composed of Cr2O3 and q-Al2O3. The mass loss of the sample tested in sulfate and chlorate mixture molten salts can be explained by the easy evaporation of the chlorate molten salt and the corrosion products. The accelerated dissolution of Cr2O3 oxide scale will occur in the chlorate containing molten salt owing to the increase of the oxygen ion activity by the reaction between water vapor in the air and gas chlorine formed during the hot corrosion process. The gas chlorine will also react with the coating to form volatility metal chlorides to increase the consumption of the coating.

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朱 明,馬宏芳,王明靜. Effects of Chlorate on the Hot Corrosion Behaviors of Cr0.82Al0.18N Coating Deposited on a Ti3Al Based Alloy[J].稀有金屬材料與工程,2014,43(12):2953~2957.[Zhu Ming, Ma Hongfang, Wang Mingjing. Effects of Chlorate on the Hot Corrosion Behaviors of Cr0.82Al0.18N Coating Deposited on a Ti3Al Based Alloy[J]. Rare Metal Materials and Engineering,2014,43(12):2953~2957.]
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  • 收稿日期:2013-12-16
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  • 在線發(fā)布日期: 2015-04-16
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