Effect of galvanic coupling between overpack materials of high-level nuclear waste containers

被引：6

作者：

Dunn, DS ^{[1
]}

Cragnolino, GA ^{[1
]}

Sridhar, N ^{[1
]}

机构：

[1] Ctr Nucl Waste Regulatory Anal, SW Res Inst, San Antonio, TX 78238 USA

来源：

CORROSION | 2000年 / 56卷 / 06期

关键词：

A516; steel; Alloy; 825; crevice corrosion; galvanic corrosion; high-level nuclear waste; localized corrosion; pitting corrosion;

D O I：

10.5006/1.3280563

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Effect of environmental parameters and area ratio on the galvanic protection of Alloy 825 (UNS N08825) by A516 Grade 60 steel (UNS K02100) was studied. A simplified model was used to calculate the potential and corrosion current density of the bimetallic couple as a function of the galvanic coupling efficiency. Galvanic corrosion tests were performed to gain confidence in the calculated values. The modeling calculations and laboratory testing indicated that with highly efficient coupling the potential of the galvanic couple could be maintained below the repassivation potential for Alloy 825. As a result, the initiation of localized corrosion on Alloy 825 can be prevented. The formation of oxides, scales, and corrosion product layers between the barriers was shown to reduce the efficiency of the galvanic couple, which may result in conditions leading to the localized corrosion of the inner, corrosion-resistant barrier.

引用

页码：598 / 610

页数：13

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