低氧压预氧化对Fe-3Al-6Cr合金表面显微组织和耐蚀性影响∗

王坤; 严靖钰; 刘亚; 吴长军; 彭浩平; 涂浩; 苏旭平

引用本文:	王坤,严靖钰,刘亚,吴长军,彭浩平,涂浩,苏旭平.低氧压预氧化对Fe-3Al-6Cr合金表面显微组织和耐蚀性影响∗[J].中国表面工程,2021,34(3):139~148
	Wang Kun,Yan Jingyu,Liu Ya,Wu Changjun,Peng Haoping,Tu Hao,Su Xuping.Effects of Low Oxygen Pressure Pre-oxidation on Surface Microstructure and Corrosion Resistance of Fe-3Al-6Cr Alloy[J].China Surface Engineering,2021,34(3):139~148

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低氧压预氧化对Fe-3Al-6Cr合金表面显微组织和耐蚀性影响∗
王坤¹, 严靖钰¹, 刘亚^1,2, 吴长军¹, 彭浩平¹, 涂浩¹, 苏旭平^1,2
1.常州大学江苏省材料表面科学与技术重点实验室常州 213164;2.常州大学江苏省光伏科学与工程协同创新中心常州 213164

摘要:

在 950 ℃ ,10-23 、10-16 和 0. 2 atm. 3 种氧压下对 Fe-3Al-6Cr 合金进行了预氧化试验,时间为 10 min~ 1200 min。并在 5% NaCl 气氛中做了耐蚀性测试。结果表明:Fe-3Al-6Cr 合金在 950 ℃ 、10-23 atm. 氧压下氧化得到的是(Al,Cr)₂O₃ 外氧化膜,在 0. 2 atm. 氧压下获得的是 Fe₂O₃ 与(Al,Cr)₂O₃ 的混合氧化层,研究结果完全符合 Factsage 软件的计算结果。在 10^-16 atm. 氧压下,氧化 10 min 的外氧化物为 FeO,合金内层存在内氧化物 Fe(Al,Cr)₂O₄ 与 FeAl 化合物。随氧化时间的延长,外层氧化物变为 FeO+Fe(Al,Cr)₂O₄ ,内氧化物为 Fe(Al,Cr)2O4+Al₂O₃ 。 Factsage 计算出了稳定后的表面氧化物种类,但没有计算出内氧化 Al₂O₃ 。在盐雾腐蚀测试中,Fe-3Al-6Cr 合金在 950 ℃ 、10^-23 atm. 氧压中氧化 30~ 60 min 制备的(Al,Cr)₂O₃ 氧化膜具有最好的耐蚀性。

关键词: 预氧化 Fe-3Al-6Cr 氧化薄膜盐雾腐蚀

DOI：10.11933/j.issn.1007-9289.20210224002

分类号:TG174

基金项目:国家自然科学基金(51871030) 和江苏省教育厅高等学校自然科学研究重大项目(17KJA430001)资助项目

Effects of Low Oxygen Pressure Pre-oxidation on Surface Microstructure and Corrosion Resistance of Fe-3Al-6Cr Alloy

Wang Kun¹, Yan Jingyu¹, Liu Ya^1,2, Wu Changjun¹, Peng Haoping¹, Tu Hao¹, Su Xuping^1,2

1.Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164 , China;2.Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164 , China

Abstract:

Pre-oxidation of Fe-3Al-6Cr alloys under three oxygen pressures of 10^-23 , 10^-16 and 0. 2 atm. at 950 ℃ for 10 min to 1 200 min was performed. Then the corrosion resistance test was done in a 5% NaCl atmosphere. Results show that the Fe-3Al-6Cr alloy was oxidized at 950 ℃ and 10^-23 atm. oxygen pressure to obtain (Al, Cr)₂O₃ outer oxide film. Under 0. 2 atm. oxygen pressure, a mixed oxide layer of Fe₂O₃ and (Al, Cr)₂O₃ was obtained, which was in full compliance with the calculation results of Factsage software. After 10 min of oxidation under 10^-16 atm. oxygen pressure, the outer oxide was FeO, and the inner layer of the alloy was Fe(Al, Cr)₂O₄ oxide and FeAl compound. With the extension of the oxidation time, the outer oxide transformed into FeO + Fe(Al, Cr)₂O₄ , and the internal oxide transformed into Fe(Al, Cr)₂O₄ + Al₂O₃ . Factsage calculated the type of surface oxide after stabilization, but did not calculate the internal oxide Al₂O₃ . In the salt spray corrosion test, the (Al, Cr)₂O₃ oxide film formed by the Fe-3Al-6Cr alloy annealing at 950 ℃ and 10^-23 atm. oxygen pressure for 30 min to 60 min had the best corrosion resistance.

Key words: pre-oxidation Fe-3Al-6Cr alloy oxide film salt spray corrosion