碘对N18锆合金应力腐蚀开裂的影响

腐蚀科学与防护技术, 2005, 17(1): 27-30. doi: 10.3969/j.issn.1002-6495.2005.01.007

碘对N18锆合金应力腐蚀开裂的影响

彭倩 ^1, , 赵文金 ^2, , 李卫军 ^3, , 唐正华 ^4, , 崔旭梅 ^5, , 衡雪梅 ^6,

1.中国核动力研究设计院核燃料及材料国家重点实验室,成都,610041

2.中国核动力研究设计院核燃料及材料国家重点实验室,成都,610041

3.中国核动力研究设计院核燃料及材料国家重点实验室,成都,610041

4.四川大学材料科学与工程学院,成都,610065

5.四川大学材料科学与工程学院,成都,610065

6.四川大学材料科学与工程学院,成都,610065

基金项目: 国家重点实验室基金(JS 0085.1.1.ZS8501) 四川省青年科技基金(04ZQ026-053)

关键词： N18锆合金 , 碘分压 , 应力腐蚀开裂 , 断口

EFFECT OF IODINE ON STRESS CORROSION CRACKING OF N18 ZIRCONIUM ALLOY

研究了再结晶退火N18锆合金在碘气氛中的应力腐蚀开裂(SCC)行为,着重研究了350℃时碘分压对该合金SCC的影响.结果表明,随着碘分压增加,N18合金对碘致应力腐蚀开裂的敏感性增加,开裂的临界应力强度因子KISCC降低,裂纹萌生所需的应力降低,裂纹萌生所需的时间也缩短;SCC裂纹的快速扩展也受碘分压的强烈影响,碘分压越高,裂纹扩展过渡到快速的穿晶准解理方式时对应的应力强度因子越低;碘分压不仅影响腐蚀产物层的形成,也影响裂纹扩展方式.碘分压的影响规律可用碘的扩散机制及Zr-I-O体系的化学平衡来解释.

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