权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Investigating the effect of Zn addition to corrosion of Alloy 600 in water-cooled reactors

研究水冷反应堆中添加 Zn 对 600 合金腐蚀的影响

基本信息

批准号：
2462238
负责人：
金额：
--
依托单位：
University of Bristol
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2020
资助国家：
英国
起止时间：
2020 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2462238
关键词：
Investigating effect Zn addition corrosion

项目摘要

The main aim of this PhD project is to understand the role of Zn injection in crack initiation and propagation in alloy 600 weld material (Primary Water Stress Corrosion Cracking, PWSCC). The student will use autoclave facilities at the University of Bristol to do short-term exposures to water at PWR temperatures and pressures, varying the amount of Zn added during the test. The student will test a matrix of different hot functional tests; with and without H2 and with or without Zinc. This work will investigate the effect of zinc injection during the hot functional testing, followed by continuous injection and discontinued injection. How does the oxide change after Zn injection is initiated? How does this affect crack initiation and growth?The student will use advanced microscopy including transmission electron microscopy, focused ion beam and X-ray tomography to understand how the oxide structure varies with increasing Zn addition, and techniques such as atom probe tomography and secondary ion mass spectrometry to understand the chemical segregation within the oxide.Once the short-term testing regime and mechanisms are better understood, the project will perform one or more longer-term tests to understand how Zn addition affects SCC behaviour. Later work will to study the long-term PWSCC resistance of alloy 600 weld material with Zn injection, replicating the conditions of primary loop in a PWR as closely as possible.

本博士项目的主要目的是了解锌注入在合金600焊接材料裂纹萌生和扩展中的作用（初级水应力腐蚀裂纹，PWSCC）。该学生将使用布里斯托尔大学的高压灭菌器设备，在压水堆温度和压力下短期暴露于水中，在测试过程中改变锌的添加量。学生将测试一个矩阵的不同热功能测试；有和没有H2，有和没有锌。本工作将在热功能测试中考察锌注射的影响，然后进行连续注射和停止注射。锌注入后氧化物发生了怎样的变化？这对裂纹萌生和扩展有何影响？学生将使用先进的显微镜，包括透射电子显微镜，聚焦离子束和x射线断层扫描来了解氧化物结构如何随着锌添加量的增加而变化，并使用原子探针断层扫描和二次离子质谱等技术来了解氧化物内部的化学分离。一旦短期测试制度和机制被更好地理解，该项目将执行一个或多个长期测试，以了解添加Zn如何影响SCC行为。后续的工作将研究合金600焊接材料在注入Zn时的长期PWSCC电阻，尽可能地复制压水堆中一次回路的条件。