夹具材料对00Cr18Ni10N不锈钢扩散连接接头耐蚀行为的影响

袁萌; 刘道新; 唐斌; 叶作彦

doi:10.13433/j.cnki.1003-8728.2015.0626

夹具材料对00Cr18Ni10N不锈钢扩散连接接头耐蚀行为的影响

doi: 10.13433/j.cnki.1003-8728.2015.0626

袁萌¹,
刘道新^1, ,,
唐斌²,
叶作彦¹

1.
西北工业大学腐蚀与防护研究所, 西安 710072;
2.
西北工业大学材料学院, 西安 710072

基金项目:

国家自然科学基金项目（51171154）资助

详细信息

作者简介:
袁萌（1989-），硕士研究生，研究方向为材料的腐蚀行为与防护技术，material2011@sina.cn

通讯作者:
刘道新，教授，博士生导师，liudaox@nwpu.edu.cn

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出版历程
- 收稿日期: 2013-09-06
- 刊出日期: 2015-06-05

Effect of the Fixture Material on the Corrosion Behavior of Diffusion Bonded Joints of 00Cr18Ni10N Stainless Steel

1.
Institute of Corrosion and Protection, Northwestern Polytechnical University, Xi'an 710072, China;
2.
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China

摘要

摘要: 为了优选出合理的夹具材料用于制备00Cr18Ni10N超低碳奥氏体不锈钢真空扩散连接接头，分别采用中性盐雾腐蚀试验方法和电化学阻抗谱（EIS）测试方法对比研究了氮化硼与石墨夹具材料对00Cr18Ni10N钢扩散连接接头在NaCl腐蚀环境中的耐蚀行为。研究结果表明：采用氮化硼夹具制备的00Cr18Ni10N不锈钢扩散连接接头保持了与基材接近的耐蚀性能，未发生点蚀和晶间腐蚀；使用石墨夹具制备的00Cr18Ni10N不锈钢扩散连接接头的耐蚀性能比基材显著降低，出现了较为严重的晶间腐蚀现象。电化学测试表明：采用石墨夹具制备的连接接头试样自腐蚀电流密度比不锈钢基材和采用氮化硼夹具制备的连接接头试样高一个数量级，其表面阻抗较基材低两个数量级。原因归于使用石墨夹具制备不锈钢扩散连接接头时，石墨夹具的碳原子扩散到不锈钢表层形成了碳的过饱和固溶体，而在随炉冷却过程中碳与铬及铁在晶界形成了碳化物（CrFe）7C3，造成不锈钢表层出现晶间贫铬现象，促进了晶间腐蚀的发生，进而导致该区域耐蚀性能降低。
- 00Cr18Ni10N超低碳不锈钢 /
- 真空扩散连接 /
- 晶间腐蚀 /
- 电化学阻抗谱
Abstract: In order to select the optimum fixture materials for vacuum diffusion bonding of 00Cr18Ni10N stainless steel, joints with boron nitride (BN) and graphite as fixture material were prepared. The effect of the fixture materials on the corrosion behavior of joints was studied by neutral salt spray corrosion test and electrochemical impedance spectroscopy (EIS) test. The experimental results show that the joint with BN as fixture material maintained similar corrosion resistance with the substrate, and no corrosion occurred. However, the corrosion resistance of the joint with graphite as fixture material decreased significantly and the joint suffered severe intergranular corrosion. Furthermore, the electrochemical tests indicated that the corrosion current density of the joint with graphite as fixture material is higher than that of stainless steel substrate and the joint manufactured with BN fixture by an order of magnitude. While its resistance is lower than that of substrate with two orders of magnitude. The reason lies in the fact that carbon atoms of graphite fixture diffused to the surface of stainless steel and it led to the formation of a supersaturated solid solution of carbon during the bonding process. In the cooling process, carbon, chromium and iron formed carbide (CrFe)7C3 in grain boundary, which caused intergranular chromium depletion on the surface of stainless steel. So the corrosion resistance of bonding area was reduced and intergranular corrosion occurred.
- 00Cr18Ni10N /
- bonding /
- boron nitride /
- corrosion

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参考文献(10)

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