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首页> 外文会议>NACE International annual conference exposition;Corrosion 2000 >STRESS CORROSION CRACKING, PASSIVE, AND LOCALIZED CORROSION OF ALLOY 22 HIGH-LEVEL RADIOACTIVE WASTE CONTAINERS
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STRESS CORROSION CRACKING, PASSIVE, AND LOCALIZED CORROSION OF ALLOY 22 HIGH-LEVEL RADIOACTIVE WASTE CONTAINERS

机译：合金22高水平放射性废物容器的应力腐蚀开裂，钝化和局部腐蚀

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摘要

Tests were conducted to determine the passive corrosion rate, and the susceptibility of Alloy 22 to localized corrosion and stress corrosion cracking. The passive corrosion rate was found to be on the range of 10~9 to 10~(-7) A/cm~2. The passive corrosion rate was not strongly dependent on either the solution pH in the range of 2.7 to 8.0 or chloride concentration from 0.028 to 4.0 M. Increasing the temperature from 25 to 95 ℃ resulted in an increase in the passive current density from 2 × 10~(-9) to 4 × 10~(- 8) A/cm~2. Results from repassivation potential measurements indicate that Alloy 22 was resistant to localized corrosion especially in solutions where the chloride concentration was less than 0.5 M. Similar results were obtained in stress corrosion cracking tests using fatigue precracked wedge loaded double cantilever beam specimens with an initial stress intensity of 34.8 MPam~(1/2). No stress corrosion cracking was observed after 8 months in 5 percent NaCl at 90 ℃. Minor grain boundary attack and limited secondary cracking were observed after an 8 month exposure to 40 percent MgCl_2 at 110 ℃.
机译：进行测试以确定被动腐蚀速率，以及22号合金对局部腐蚀和应力腐蚀开裂的敏感性。被动腐蚀速率在10〜9到10〜（-7）A / cm〜2范围内。钝化腐蚀速率与溶液的pH值在2.7至8.0范围内或氯化物浓度从0.028至4.0 M都没有强烈关系。温度从25升高到95℃会使钝化电流密度从2×10增加〜（-9）至4×10〜（-8）A / cm〜2。重钝化电位测量的结果表明，合金22对局部腐蚀具有抵抗力，尤其是在氯化物浓度小于0.5 M的溶液中。使用疲劳预裂纹楔形加载双悬臂梁试样并具有初始应力强度的应力腐蚀开裂试验获得了相似的结果。为34.8 MPam〜（1/2）。在90℃的5％NaCl中8个月后没有观察到应力腐蚀开裂。 110℃暴露于40％MgCl_2 8个月后，观察到较小的晶界侵蚀和有限的二次裂纹。

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