Pitting corrosion and crevice corrosion behaviors of high nitrogen austenitic stainless steels |
| |
| Authors: | Hua-bing Li Zhou-hua Jiang Yan Yang Yang Cao Zu-rui Zhang |
| |
| Affiliation: | School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China |
| |
| Abstract: | ![]()
Pitting corrosion and crevice corrosion behaviors of high nitrogen austenitic stainless steels (HNSS) were investigated by electrochemical and immersion testing methods in chloride solution, respectively. The chemical constitution and composition in the depth of passive films formed on HNSS were analyzed by X-ray photoelectron spectrum (XPS). HNSS has excellent pitting and crevice corrosion resistance compared to 316L stainless steel. With increasing the nitrogen content in steels, pitting potentials and critical pitting temperature (CPT) increase, and the maximum, average pit depths and average weight loss decrease. The CPT of HNSS is correlated with the alloying element content through the measure of alloying for resistance to corrosion (MARC). The MARC can be expressed as an equation of CPT=2.55MARC-29. XPS results show that HNSS exhibiting excellent corrosion resistance is attributed to the enrichment of nitrogen on the surface of passive films, which forms ammonium ions increasing the local pH value and facilitating repassivation, and the synergistic effects of molybdenum and nitrogen. |
| |
| Keywords: | high nitrogen austenitic stainless steel pitting corrosion crevice corrosion nitrogen critical pitting temperature synergistic effect |
| 本文献已被 ScienceDirect 等数据库收录！ |
| 点击此处可从《矿物冶金与材料学报》浏览原始摘要信息 |
|
点击此处可从《矿物冶金与材料学报》下载免费的PDF全文 |
