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Fe24Mn4Al5Cr合金高溫氧化誘發(fā)貧Mn層的耐蝕性
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國家自然科學(xué)基金 (59901003)


Corrosion Resistance of Oxidation-Induced Mn Depletion Layer on Austenitic Fe24Mn4Al5Cr Alloy
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    摘要:

    研究了Fe24Mn4Al5Cr合金在800和950 ℃空氣中的循環(huán)氧化動力學(xué)及氧化層形貌、成分和組織結(jié)構(gòu)。由于Mn元素的選擇性氧化，在氧化層與基體之間形成高耐蝕性的貧Mn鐵素體層。對貧Mn鐵素體層的耐腐蝕性能進(jìn)行了分析。結(jié)果表明，950 ℃氧化10 h后，氧化層與基體間形成形狀彎曲、厚度約6 μm、較基體貧Mn (5 at%)、富Fe (85 at%)的鐵素體層。降低氧化溫度至800 ℃、延長氧化時間至160 h，氧化層與基體之間形成連續(xù)平整、厚度約9 μm的貧Mn (6 at%~19 at%)、富Fe (83 at%~72 at%)和富Cr (8 at%)的鐵素體層。在1 mol/L Na2SO4溶液中于800 ℃氧化160 h后的鐵素體貧Mn層的陽極極化曲線呈自鈍化，自腐蝕電位Ecorr由原始合金的–710 mV提高至57 mV，維鈍電流密度ip從3.3 μA/cm2下降至0.7 μA/cm2，耐蝕性能提高

    Abstract:

    The oxidation kinetics of austenitic Fe24Mn4Al5Cr alloy oxidized at 800 °C for 160 h and 950 °C for 10 h in air, and the surface morphology, composition and the microstructure of the oxide scales were investigated in order to improve the corrosion resistance. An oxidation-induced Mn depletion layer between the alloy matrix and the oxide scales formed at the two oxidation temperatures by the selective oxidation of Mn. The results show that after oxidation at 800 °C for 160 h, the continueous and smooth ferrite layer about 9 μm thick near the scale-metal interface has an enrichment of Fe content of 83 at%~72 at% and Cr content of 8 at%, and a depletion Mn of 6 at%~19 at%. However, at 950 °C for 10 h, the ferrite layer about 6 μm thick is in curved shape with the enrichment in Fe of 85at% and the depletion in Mn of 5at%. The anodic polarization curves of the Mn depletion layer at 800 °C for 160 h in 1 mol·L-1 Na2SO4 solution has a self-passivation, with the higher corrosion potential of 57 mV(SCE) and the lower passive current density of 0.7 μA/cm2, compared with –710 mV(SCE) and 3.3 μA/cm2 for Fe24Mn4Al5Cr austenitic alloy. Therefore, the corrosion resistance of the oxidation-induced Mn depletion layer on Fe24Mn4Al5Cr alloy increases

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朱雪梅,張振衛(wèi),王新建,張彥生. Fe24Mn4Al5Cr合金高溫氧化誘發(fā)貧Mn層的耐蝕性[J].稀有金屬材料與工程,2015,44(12):3197~3201.[Zhu Xuemei, Zhang Zhenwei, Wang Xinjian, Zhang Yansheng. Corrosion Resistance of Oxidation-Induced Mn Depletion Layer on Austenitic Fe24Mn4Al5Cr Alloy[J]. Rare Metal Materials and Engineering,2015,44(12):3197~3201.]
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  • 收稿日期:2014-12-15
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  • 在線發(fā)布日期: 2016-08-29
  • 出版日期: 2015-12-25