论文总字数：18022字

摘 要

奥氏体不锈钢依靠其优秀的耐蚀性、加工性能以及高韧性，在食品、汽车加工业、医疗器械、制药设备等领域应用普遍。但是其表面性能较差不能满足许多生产方面的需求，不锈钢设备的性能和寿命受到了严重影响。

在表面工程领域，在保证其表面性能的同时提高耐蚀性能已经显得十分重要，低温超饱和气体渗碳技术( Low Temperature Colossal Superaturation Gas Carburization, LTCSGC )应运而生。最近几年来，部分学者在LTCSGC表面强化技术方面已经展开了许多的研究，但在抗腐蚀性能方面却研究较少。所以，对本文的课题进行深入研究和分析总结，对LTCSGC工艺的应用，具有重要的影响。

我的论文主要研究316L不锈钢，通过化学浸泡法和沸腾试验，对比分析低温气体渗碳层在点腐蚀环境和晶间腐蚀环境下的耐蚀性能，结果表明：

（1）在草酸溶液中，渗碳层的耐蚀性能优于316L奥氏体不锈钢。通过对比经过低温超饱和气体渗碳表面强化处理的316L试样和未处理316L试样的腐蚀速率发现，拥有渗碳层保护的奥氏体不锈钢，腐蚀速率显著降低。

（2）在微沸的硫酸铜试验情况下，经过低温超饱和气体渗碳表面强化处理的试验的质量损失明显比未处理的材料的失重要大。然而过高的质量损失并非由于晶间腐蚀，而是因为其发生均匀腐蚀。

关键词：低温渗碳；316L奥氏体不锈钢；点蚀；晶间腐蚀；耐蚀性

Effect of Carburizing Strengthening Treatment on Pitting and Intergranular Corrosion of 316L Stainless Steel

ABSTRACT

Austenitic stainless steel depends on its excellent corrosion resistance, processing performance and high toughness, in the food, automotive processing industry, medical equipment, pharmaceutical equipment and other fields in general. But its poor surface performance can not meet many production needs, the performance and life of stainless steel equipment has been seriously affected.

In the field of surface engineering, it is very important to improve the corrosion resistance while ensuring its surface properties. Low Temperature Colossal Superaturation Gas Carburization (LTCSGC) came into being. In recent years, some scholars in the LTCSGC surface strengthening technology has been a lot of research, but in the anti-corrosion performance is less studied. Therefore, the subject of this article in-depth study and analysis of the LTCSGC process, the application has an important impact.

In this paper, 316L stainless steel was studied by chemical immersion method and boiling test. The corrosion resistance of low temperature gas carburized layer under the condition of corrosive environment and intergranular corrosion was analyzed. The results showed that:

   (1) In the oxalic acid solution, the carburized layer corrosion resistance is better than 316L austenitic stainless steel. By comparing the corrosion rate of the 316L sample and the untreated 316L sample subjected to the low temperature supersaturated gas carburizing surface, it was found that the corrosion rate of the austenitic stainless steel with carburized layer was significantly reduced.

   (2) In the case of micro-boiling copper sulfate test, the quality loss of the test after the low-temperature supersaturated gas carburizing surface strengthening treatment is significantly larger than that of the untreated material. However, excessive mass loss is not due to intergranular corrosion, but because of its uniform corrosion.

Key words: low temperature carburizing; 316L austenitic stainless steel; pitting corrosion; intergranular corrosion; corrosion resistance

目 录

摘要 I

ABSTRACT II

第一章 绪论 1

1.1 引言 1

1.2 奥氏体不锈钢低温表面强化处理技术研究进展 1

1.2.1 低温离子渗氮 2

1.2.2 低温离子渗碳 2

1.3 奥氏体不锈钢抗蚀的原理 2

1.3.1 奥氏体不锈钢腐蚀研究进展 2

1.3.2 低温气体渗碳对耐蚀性影响研究进展 3

1.4 研究的主要内容 6

第二章 点蚀试验 7

2.1 低温超饱和气体渗碳试验 7

2.1.1 试验步骤 7

2.1.2 试验材料及设备 8

2.1.3 试验结果与讨论 9

2.2 三氯化铁点腐蚀试验 9

2.2.1 试验步骤 9

2.2.2 试验材料及设备 10

2.2.3 试验结果与讨论 10

2.2.4 小结 14

第三章 晶间腐蚀试验 15

3.1 硫酸铜晶间腐蚀试验 15

3.1.1 试验步骤 15

3.1.2 试验材料及设备 15

3.1.3 试验结果与讨论 17

3.1.4 小结 21

第四章 经济效益评价 22

第五章 结论与展望 23

5.1 论文主要工作总结 23

5.2 后续工作展望 23

致谢 24

参考文献 25

第一章 绪论

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