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侯可可,黄娇,姚美意,孙蓉蓉,龙冲生,张金龙,周邦新.Stress and Defect Characteristics in Oxide Films and Corrosion Resistance of Zr-1Nb Alloy[J].稀有金属材料与工程(英文),2019,48(5):1440~1446.[Hou Keke,Huang Jiao,YAO Meiyi,Sun Rongrong,Long Chongsheng,Zhang Jinlong and Zhou Bangxin.Stress and Defect Characteristics in Oxide Films and Corrosion Resistance of Zr-1Nb Alloy[J].Rare Metal Materials and Engineering,2019,48(5):1440~1446.]
Stress and Defect Characteristics in Oxide Films and Corrosion Resistance of Zr-1Nb Alloy
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Received:December 23, 2017  Revised:January 11, 2018
DOI:
Key words: Zirconium alloys  Corrosion  Ion migration method  Defects  Stress
Foundation item:国家自然科学基金项目
Author NameAffiliation
Hou Keke,Huang Jiao,YAO Meiyi,Sun Rongrong,Long Chongsheng,Zhang Jinlong and Zhou Bangxin  
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Abstract:
      Two approaches to testing corrosion in autoclave with different time intervals for heating and cooling were carried out to investigate the corrosion resistance of Zr-1Nb alloy in the 0.01 mol/L LiOH aqueous solution at 360 °C/18.6 MPa, the stress, and defect density in the oxide film. The stress and defect density in oxide film were measured by a curl method and the Ion Migration Method (IMM), respectively. Results showed that the stress level and defect density in the oxide film in the shorter interval corrosion tests were lower than that in the longer interval corrosion tests at the initial stage of corrosion with the weight gain less than 34.37 mg/dm2. The corrosion resistance in the subsequent stages of corrosion was better in the shorter interval corrosion tests. It indicates that at the initial stage of corrosion the weight gain shows no obvious difference between the two approaches of corrosion tests in autoclave under different time intervals for heating and cooling. However, the stress level and defect density in the oxide film exhibit noticeable differences, which leads to two distinct microstructural evolution rates of the oxide film. The distinct microstructural evolution rates cause different corrosion resistance in the subsequent corrosion stages.